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subsurface/Documentation/user-manual_fr.txt
Henrik Brautaset Aronsen 961bac9233 Rename the tab "Dive info" to "Info", and "Dive notes" to "Notes" 
Signed-off-by: Henrik Brautaset Aronsen <subsurface@henrik.synth.no>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
2015-02-14 11:18:53 -08:00

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:toc:
:toc-placement: manual
:numbered:
image::images/Subsurface4Banner.jpg["Banner", align="center"]
[big]#MANUEL UTILISATEUR#
*Auteurs du manuel* : Willem Ferguson, Jacco van Koll, Dirk Hohndel, Reinout Hoornweg,
Linus Torvalds, Miika Turkia, Amit Chaudhuri, Jan Schubert, Salvador Cuñat, Pedro Neves
[blue]#_Version 4.4, Février 2015_#
Bienvenue en tant qu'utilisateur de _Subsurface_, un programme avancé
d'enregistrement de plongées (carnet de plongées) avec une bonne
infrastructure pour décrire, organiser, interpréter et imprimer des plongées
en scaphandre et en apnée. _Subsurface_ offre de nombreux avantages par
rapport à d'autres solutions logicielles similaires :
- Avez-vous besoin d'une façon d'enregistrer vos plongées utilisant des
équipements loisirs, même sans utiliser d'ordinateur de plongée ?
- Utilisez-vous deux marques différentes d'ordinateurs de plongée, chacun avec
son propre logiciel propriétaire pour télécharger les enregistrements des
plongées ? Plongez-vous avec un recycleur ou un équipement en circuit ouvert
ou de loisir ? Utilisez-vous un enregistreur de profondeur et de durée
Reefnet Sensus avec un ordinateur de plongée ? _Subsurface_ offre une
interface standard pour télécharger les enregistrements des plongées à
partir de tous ces équipements de plongée et pour enregistrer et analyser
ces enregistrements dans un système unique.
- Utilisez-vous plus d'un système d'exploitation ? _Subsurface_ est
intégralement compatible avec Mac, Linux et Windows, ce qui vous permet
d'accéder à vos enregistrements de plongées sur chaque système
d'exploitation en utilisant une application unique.
- Utilisez-vous Linux ou Mac et votre ordinateur de plongée n'a que des
logiciels pour Windows pour télécharger les informations de plongées (par
exemple Mares) ? _Subsurface_ fournit un moyen de télécharger et d'analyser
vos enregistrements de plongées sur d'autres systèmes d'exploitation.
- Avez-vous besoin d'un planificateur de plongée graphique intuitif qui
intègre et prend en compte les plongées qui ont déjà été enregistrées ?
_Subsurface_ est disponible pour Windows (Win XP ou plus récent), les Macs
basés sur processeurs Intel (OS/X) et de nombreuses distributions
Linux. _Subsurface_ peut être compilé pour bien plus de plateformes
matérielles et d'environnements logiciels où Qt et libdivecomputer sont
disponibles.
Le but de ce document est l'utilisation du programme Subsurface. Pour
installer le logiciel, consultez la page _Téléchargement_ sur le
http://subsurface-divelog.org/[site web de _Subsurface_]. En cas de
problème, vous pouvez envoyer un e-mail sur
mailto:subsurface@subsurface-divelog.org[notre liste de diffusion] et
rapportez les bogues sur http://trac.hohndel.org[notre bugtracker]. Pour
des instructions de compilation du logiciel et (si besoin) de ses
dépendances, merci de consulter le fichier INSTALL inclus dans les sources
logicielles.
*Public* : Plongeurs loisirs, apnéistes, plongeurs Tek et plongeurs
professionnels
toc::[]
[[S_UserSurvey]]
Utilisation de ce manuel
------------------------
Lorsqu'il est ouvert depuis _Subsurface_, ce manuel n'a pas de contrôles
externes. Cependant, une fonction de _RECHERCHE_ est importante. Elle est
activée par la combinaison de touches du clavier Ctrl-F ou commande-F. Un
champ de recherche apparait en bas de la fenêtre. Il suffit de l'utiliser
pour rechercher n'importe quel terme dans le manuel.
Le sondage utilisateur
----------------------
Dans le but de développer _Subsurface_ d'une manière qui serve ses
utilisateurs de la meilleur manière qu'il soit, il est important d'avoir des
informations sur les utilisateurs. À l'ouverture de _Subsurface_ après avoir
utilisé le logiciel pendant une semaine environ, une fenêtre de sondage
apparait. Cela est complètement optionnel et l'utilisateur contrôle quelles
informations sont envoyées ou non à l'équipe de développement de
_Subsurface_. Toutes les données que l'utilisateur choisit d'envoyer sont
extrêmement utiles et ne seront utilisées que pour les futures
développements et modifications du logiciel pour coller au mieux aux besoins
des utilisateurs de _Subsurface_. Si vous complétez le sondage ou cliquez
sur l'option pour ne plus être sondé, cela devrait être la dernière
communication de ce type que vous recevrez. Cependant, si vos habitudes de
plongées ou d'utilisation de Subsurface changent, vous pouvez envoyer un
nouveau sondage en démarrant _Subsurface_ avec l'option _--survey_ sur la
ligne de commande.
[[S_StartUsing]]
Commencer à utiliser le programme
---------------------------------
La fenêtre _Subsurface_ est généralement divisée en 4 panneaux avec un *Menu
principal* (Fichier Importer Journal Vue Aide) en haut de la fenêtre (pour
Windows et Linux) ou en haut de l'écran (pour Mac et Ubuntu Unity). Les
quatre panneaux sont :
La *liste des plongées* en bas à gauche, contenant une liste de toutes les
plongées du journal (carnet) de plongées de l'utilisateur. Une plongée peut
être sélectionnée et mise en surbrillance dans la liste en cliquant
dessus. Dans la plupart des cas, les touches haut/bas peuvent être utilisée
pour passer d'une plongée à l'autre. La *liste des plongées* est un outil
important pour manipuler un journal (carnet) de plongée.
La *carte de plongée* en bas à droite, affiche les sites de plongées de
l'utilisateur, sur une carte mondiale et centrée sur le site de la dernière
plongée sélectionnée dans la *liste des plongées*.
Les *informations de plongée* en haut à gauche, fournissent des informations
détaillées sur la plongée sélectionnée dans la *liste des plongées*, dont
des statistiques pour la plongée sélectionnée ou pour toutes les plongées
mises en surbrillance.
Le *profil de plongée* en haut à droite, affiche un profil de plongée
graphique de la plongée sélectionnée dans la *liste des plongées*.
Les séparateurs entre ces panneaux peuvent être déplacés pour modifier la
taille de chaque panneau. _Subsurface_ mémorise la position de ces
séparateurs, pour qu'au prochain lancement _Subsurface_ utilise ces
positions.
Si une plongée est sélectionnée dans la *liste des plongées*, l'emplacement
de la plongée, les informations détaillées et le profil de la _plongée
sélectionnée_ sont affichées dans les panneaux respectifs. D'autre part, si
plus d'une plongée est mise en surbrillance seule la dernière mise en
surbrillance est la _plongée sélectionnée_, mais les données de _toutes les
plongées mises en surbrillances_ sont affichées dans l'onglet *Stats* du
panneau *informations de plongée* (profondeur maximale, minimale et moyenne,
les durées, les températures de l'eau et le SAC (air consommé); temps total
et nombre de plongées sélectionnées).
[[S_ViewPanels]]
image::images/main_window_f20.jpg["The Main Window", align="center"]
L'utilisateur peut déterminer si lesquels des quatre panneaux sont affichés
en sélectionnant l'option *Vue* dans le menu principal. Cette fonctionnalité
permet plusieurs choix d'affichage :
*Tout* : affiche les quatre panneaux tels que sur la capture d'écran ci-dessus.
*Liste des plongées* : affiche uniquement la liste des plongées.
*Profil* : affiche uniquement le profile de plongée de la plongée sélectionnée.
*Info* : affiche uniquement les notes de plongées de la dernière plongée sélectionnée et les statistiques pour
toutes les plongées mises en surbrillance.
*Globe* : affiche uniquement la carte mondiale, centrée sur la dernière plongée sélectionnée.
Comme la plupart des autre fonctions qui peuvent être accédée via le menu
principal, ces options peuvent être utilisées par des raccourcis
clavier. Les raccourcis pour un système particulier sont affichés avec un
souligné des les entrées de menu. À cause des différents systèmes
d'exploitation et des divers langues, _Subsurface_ peut utiliser différentes
touches de raccourcis et ne sont donc pas détaillées ici.
Lorsque le programme est lancé pour la première fois, il n'affiche aucune
information. Ceci parce que le programme n'a aucune information de plongée
disponible. Dans les sections suivantes, le procédure pour créer a nouveau
carnet de plongée sera détaillée.
[[S_NewLogbook]]
Créer un nouveau carnet de plongée
----------------------------------
Sélectionner _Fichier -> Nouveau carnet de plongée_ à partir du menu
principal. Toutes les données de plongées sont effacées pour que de
nouvelles puissent être ajoutées. S'il existe des données non encore
enregistrées dans le carnet ouvert, l'utilisateur devra sélectionner s'il
faut les enregistrer ou non avant de créer le nouveau carnet.
[[S_GetInformation]]
== Storing dive information in the logbook
Now that a new logbook was created, it is simple to add dive data to it.
_Subsurface_ allows several ways of adding dive data to a logbook, detailed
in the following sections.
1) If the user has a handwritten divelog, a spreadsheet or another form of
manually maintained divelog, dive data can be added to the logbook using one
of these approaches:
- Enter dive information by hand. This is useful if the diver did not
use a dive computer and dives were recorded in a written logbook. See:
xref:S_EnterData[Entering dive information by hand]
- Import dive log information that has been maintained either as a spreadsheet
or as a CSV file. Refer to: xref:S_Appendix_D[APPENDIX D: Exporting a
spreadsheet to CSV format] and to xref:S_ImportingCSVDives[Importing dives
in CSV format].
2) If one has dives recorded using a dive computer, the depth profile of the
dive and a large amount of additional information can be accessed. These
dives can be imported from:
- The divecomputer itself. See: xref:S_ImportDiveComputer[Importing new dive
information from a Dive Computer] or
- Proprietary software distributed by manufacturers of dive computers. Refer
to: xref:S_ImportingAlienDiveLogs[Importing dive information from other
digital data sources or other data formats].
- Import from spreadsheet or CSV files containing dive profiles.
See: xref:S_ImportingCSVDives[Importing dives in CSV format from dive
computers or other dive log software]
[[S_EnterData]]
=== Entering dive information by hand
This is usually the approach for dives without a dive computer. The basic
record of information within _Subsurface_ is a dive. The most important
information in a simple dive logbook usually includes dive type, date, time,
duration, depth, the names of your dive buddy and of the dive master or dive
guide, and some remarks about the dive. _Subsurface_ can store much more
information than this for each dive. In order to add a dive to a dive log,
select _Log -> Add Dive_ from the Main Menu. The program then shows three
panels to enter information for a dive: two tabs in the *Info* panel
(*Notes* and *Equipment*), as well as the *Dive Profile* panel that
displays a graphical profile of each dive. These panels are respectively
marked [red]#A#, [red]#B# and [red]#C# in the figure below. Each of these
tabs will now be explained for data entry.
image::images/AddDive1_f20.jpg["FIGURE: Add dive", align="center"]
When one edits a field in Notes or Equipment panels, _Subsurface_
enters *Editing Mode*, indicated by the message in the blue box at the top
of the _Notes_ panel (see the image below). This message is displayed
in all the panels under Notes and Equipment when in *Editing Mode*.
image::images/BlueEditBar_f20.jpg["Blue edit bar", align="center"]
The _Save_ button should only be selected after all the parts of a dive have
been entered. When entering dives by hand, the _Info_, _Equipment_ and
_Profile_ tabs should be completed before saving the information. By
selecting the _Save_ button, a local copy of the information for this
specific dive is saved in memory. When one closes Subsurface, the program
will ask again, this time whether the complete dive log should be saved on
disk or not.
==== Notes de plongée
This panel contains the date, time and place information for a particular
dive, environmental conditions, co-divers and buddies, as well as some
descriptive information. If one clicks on the *Notes* tab, the
following fields are visible:
image::images/AddDive2_f20.jpg["FIGURE: The Notes tab", align="center"]
The *Time* field reflects the date and the time of the dive. By clicking the
date, a calendar is displayed from which one can choose the correct
date. Press ESC to escape from the calendar. The time values (hour and
minutes) can also be edited directly by clicking on each of them in the text
box and by overtyping the information displayed. The default date is the
present date and the default time is an hour in advance of the present time.
*Air and water temperatures*: the air and water temperatures during the
dive can be typed directly on the fields to the right of the Start time.
Temperature units are not needed, as they will be automatically supplied by
_Subsurface_. Only the numerical value must be
typed by the user (the units selected in the 'Preferences'
will determine whether metric or imperial units are used).
*Location*: Here the name of the dive site can be entered, e.g. "Tihany, Lake
Balaton,
Hungary". Auto completion of location names will make this easier if one
frequently dives at the same sites.
*Coordinates*: The geographic coordinates of the dive site should be entered
here. These can come from three sources:
a. One can find the coordinates on the world map in the bottom right hand part
of the Subsurface window. The map displays a green bar indicating "No
location data - Move the map and double-click to set the dive
location". Upon a double-click at the appropriate place, the green bar
disappears and the coordinates are stored.
b. The coordinates can be obtained from the _Subsurface_ Companion app if the
user has an Android or iPhone device with GPS and if the coordinates of the
dive site were stored using that device. xref:S_Companion[Click here for
more information]
c. The coordinates can be entered by hand if they are known, using one of four
formats with latitude followed by longitude:
ISO 6709 Annex D format e.g. 30°13'28.9"N 30°49'1.5"E Degrees and decimal
minutes, e.g. N30° 13.49760' , E30° 49.30788' Degrees minutes seconds,
e.g. N30° 13' 29.8" , E30° 49' 1.5" Decimal degrees, e.g. 30.22496 ,
30.821798
Southern hemisphere latitudes are given with a *S*, e.g. S30°, or with a
negative value, e.g. -30.22496. Similarly western longitudes are given with
a *W*, e.g. W07°, or with a negative value, e.g. -7.34323.
Some keyboards don't have the degree sign (°). It can be replaced by a d
like that: N30d W20d.
Please note that GPS coordinates of a dive site are linked to the Location
name - so adding coordinates to dives that do not have a location
description will cause unexpected behaviour (Subsurface will think that all
of these dives have the same location and try to keep their GPS coordinates
the same).
*Dive mode*: This is a dropdown box allowing one to choose the type of dive
performed. The options are OC (Open Circuit, the default setting, meant for most recreational dives),
Freedive (dive without SCUBA equipment), CCR (Closed-circuit
rebreather) and pSCR (Passive semi-closed rebreather).
*Divemaster*: The name of the dive master or dive guide for this dive can be
entered here.
Again, this field offers auto completion based on the list of dive masters in
the current logbook.
*Buddy*: In this field one can enter the name(s) of the buddy / buddies
(separated by commas) who accompanied the user on the dive. Auto completion
is offered based on the list of buddies in the current logbook.
*Suit*: The type of diving suit used for the dive can be entered here.
As with the other items, auto completion of the suit description is available.
Some dry-suit users may choose to use this field to record what combination of
suit and thermal protection undersuit was used.
*Rating*: One can provide a subjective overall rating of the dive on a
5-point scale by clicking the appropriate star on the rating scale.
*Visibility*: Similarly, one can provide a rating of visibility during the
dive on a
5-point scale by clicking the appropriate star.
*Tags*: Tags that describe the type of dive performed may
be entered here (separated by commas). Examples of common tags are boat, drift,
training, cave etc. _Subsurface_ has many built-in tags. Auto completion is once again offered.
For instance, if +cav+ was typed, then the tags *cave* and *cavern* are
shown for the user to choose from.
*Notes*: Any additional information can be typed here.
The *Save* and *Cancel* buttons are used to save all the information for
tabs in the info panel and in the dive profile panel, so there's no need to
use them until ALL other information has been added. Here is an example of a
completed Notes panel:
image::images/CompletedDiveInfo_f20.jpg["FIGURE: A completed Notes tab", align="center"]
==== Equipment
The Equipment tab allows the user to enter information about the type of
cylinder and gas used, as well as the weights used for a dive. This is a
highly interactive part of _Subsurface_ and the information on cylinders and
gases (entered here) affects the behaviour of the dive profile (top
right-hand panel).
[[S_CylinderData]]
*Cylinders*: The cylinder information is entered through a dialogue that looks
like this:
image::images/Gas_dialogue1_f20.jpg["FIGURE:Initial cylinder dialogue", align="center"]
The + button at the top right allows the user to add more cylinders for this
dive. The dark dustbin icon on the left allows one to delete information
for a particular cylinder. Note that it is not possible to delete a cylinder
if it is used during the dive. One cylinder is implicitly used in the dive,
even without a gas change event. Thus the first cylinder cannot be deleted
until another cylinder is created.
Start by selecting a cylinder type on the left-hand side of the table. To
select a cylinder, click in the *Type* box. This brings up a button that
can be used to display a dropdown list of cylinders:
image::images/Gas_dialogue2_f20.jpg["FIGURE:The cylinder drop-down list button", align="center"]
The drop-down list can be used to select the cylinder type used for the dive
or the user may start typing in the box which shows the available options
for the entered characters. The *Size* of the cylinder as well as its
working pressure (*WorkPress*) will automatically be shown in the
dialogue. If a cylinder is not shown in the dropdown list, type the name and
description of that cylinder into the *Type* field.
Next, indicate the starting pressure and the ending pressure of the gas used
during the dive. The unit of pressure (metric/imperial) corresponds to the
setting in the _Preferences_.
Finally, type in the gas mixture used in the *O2%* field. If air was used, a
value of 21% can be entered on this field, or it might be left blank. If
nitrox or trimix were used, their percentages of oxygen and/or helium must
be specified. Any inappropriate fields should be left empty. After typing
the information for the cylinder, press _ENTER_ on the keyboard or click
outside the cell that contains the cursor. Information for any additional
cylinders can be added by using the + button at the top right
hand. Following is an example of a complete description for a dive made
using two cylinders (air and EAN50):
image::images/CylinderDataEntry3_f20.jpg["FIGURE: a completed cylinder dive information table", align="center"]
*Weights*: Information about the weight system used during a dive can be entered
using a dialogue very similar to that for the cylinder information. If the user
clicks the + button on the top right of the weights dialogue, the table looks
like this:
image::images/WeightsDataEntry1_f20.jpg["FIGURE: The Weights dialogue", align="center"]
If one then clicks on the *Type* field, a drop-down list becomes accessible
through a down-arrow:
image::images/WeightsDataEntry2_f20.jpg["FIGURE: Weights type drop-down list button", align="center"]
The drop-down list can then be used to select the type of weight system or
the user may start typing in the box which shows the available options for
the entered characters. In the *Weight* field, the weight used during the
dive must be typed. After typing the information for the weight system the
user must either press _ENTER_ on the keyboard or click outside the cell
that contains the cursor. It is possible to enter information for more than
one weight system by adding an additional system using the + button on the
top right hand. Weight systems can be deleted using the dustbin icon on the
left hand. Here is an example of information for a dive with two types of
weights: integrated and a weight belt:
image::images/WeightsDataEntry3_f20.jpg["FIGURE: A completed weights information table", align="center"]
There's NO need to click the _Save_ button before the dive profile has been
completed.
[[S_CreateProfile]]
==== Creating a Dive Profile
The *Dive Profile* (a graphical representation of the depth of the dive as a
function of time) is indicated in the panel on the top right hand of the
_Subsurface_ window. When a dive is manually added to a logbook,
_Subsurface_ presents a default dive profile that needs to be modified to
best represent the dive being described:
image::images/DiveProfile1_f20.jpg["FIGURE: Initial dive profile", align="center"]
_Modifying the dive profile_: When the cursor is moved around the dive
profile, its position is indicated by two coloured lines (red and green) as
shown below. The depth and time that the cursor represents are indicated at
the top of the black information box (@ and D). The units (metric/imperial)
on the axes are determined by the *Preference* settings. The dive profile
itself comprises several line segments demarcated by waypoints (white dots
on the profile, as shown above). The default dive depth is 15 m. If the
dive depth was 20 m then the user needs to drag the appropriate waypoints
downwards to represent 20 m. To add a waypoint, double-click on any line
segment. To move an additional waypoint, drag it. To remove this waypoint,
right-click on it and choose "Remove this point" from the context menu. The
user needs to drag the waypoints to represent an accurate time duration for
the dive. Below is a dive profile that represents a dive to 20 m for 30 min,
followed by a 5 minute safety stop at 5 m.
image::images/DiveProfile2_f20.jpg["FIGURE: Edited dive profile", align="center"]
_Specifying the gas composition:_ The gas composition used is clearly
indicated along the line segments of the dive profile. This defaults to the
first gas mixture specified in the *Equipment* tab, which was air in the
case of the profile illustrated above. The gas mixtures of segments of the
dive profile can be edited. This is done by right-clicking on the particular
waypoint and selecting the appropriate gas from the context menu. Changing
the gas for a waypoint affects the gas shown in the segment _to the left_ of
that waypoint. Note that only the gases defined in the *Equipment* tab
appear in the context menu.
image::images/DiveProfile3_f20.jpg["FIGURE: Gas composition context menu", align="center"]
Below is the profile of a dive to 25 m for 30 min and with a switch from air
to EAN50 at the end of the duration at 20m. In this case the first cylinder
in the *Equipment* tab contained air and the second cylinder contained
EAN50.
image::images/DiveProfile4_f20.jpg["FIGURE: Completed dive profile", align="center"]
==== Saving the hand-entered dive information
The information entered in the *Notes* tab, the *Equipment* tab as well
as the *Dive Profile* can now be saved in the user's logbook by using the
two buttons on the top right hand of the Notes tab. If the _Save_
button is clicked, the dive data are saved in the current logbook. If the
_Cancel_ button is clicked, the newly entered dive data are discarded. When
exiting _Subsurface_, the user will be prompted once more to save the
logbook with the new dive(s).
[[S_ImportDiveComputer]]
=== Importing new dive information from a Dive Computer
==== Connecting and importing data from a dive computer.
The use of dive computers allows the collection of a large amount of
information about each dive, e.g. a detailed record of depth, duration,
rates of ascent/descent and of gas partial pressures. _Subsurface_ can
capture this information and present it as part of the dive information,
using dive information from a wide range of dive computers. The latest list
of supported dive computers can be found at:
link:http://subsurface-divelog.org/documentation/supported-dive-computers/[
Supported dive computers].
[icon="images/icons/warning2.png"]
[WARNING]
Several dive computers consume more power when they are in their
PC-Communication mode. **This could drain the dive computer's battery**. We
therefore recommend that the user checks if the dive computer is charged
when connected to the USB port of a PC. For example, several Suunto and
Mares dive computers do not recharge through the USB connection. Users
should refer to the dive computer's manual if they are unsure whether the
dive computer recharges its batteries while connected to the USB port.
To import dive information from a dive computer to a computer with
_Subsurface_, it is necessary that the two pieces of equipment communicate
with one another. This involves setting up the communications port (or
mount point) of the computer with _Subsurface_ that communicates with the
dive computer. In order to set up this communication, one needs to find the
appropriate information to instruct _Subsurface_ where and how to import the
dive information.
xref:_appendix_a_operating_system_specific_information_for_importing_dive_information_from_a_dive_computer[Appendix
A] provides the technical information to help the user achieving this for
different operating systems and
xref:_appendix_b_dive_computer_specific_information_for_importing_dive_information[Appendix
B] has dive computer specific information.
After this, the dive computer can be hooked up to the user's PC, which can
be achieved by following these steps:
1. The interface cable should be connected to a free USB port (or the Infra-red
or Bluetooth connection set up as described later in this manual)
2. The dive computer should be placed into PC Communication mode.
(Users should refer to the manual of their specific dive computer)
3. In _Subsurface_, from the Main Menu, the user must select _Import -> Import
From Dive Computer_. Dialogue *A* in the figure below appears:
image::images/DC_import_f20.jpg["FIGURE: Download dialogue 1", align="center"]
Dive computers tend to keep a certain number of dives in their memory, even
though these dives have already been imported to _Subsurface_. For that
reason, if the divecomputer allows this, _Subsurface_ only imports dives
that have not been uploaded before. This makes the download process faster
on most dive computers and also saves battery power of the dive computer (at
least for those not charging while connected via USB). If, for some reason,
the user wishes to import ALL dives from the dive computer, even though some
may already be in the logbook, then check the check box labelled _Force
download of all dives_.
- The dialogue has two drop-down lists, *Vendor* and *Dive Computer*. On the
*vendor* drop-down list select the make of the computer, e.g. Suunto,
Oceanic, Uwatec, Mares. On the *Dive Computer* drop-down list, the model
name of the dive computer must be selected, e.g. D4 (Suunto), Veo200
(Oceanic), or Puck (Mares).
- The *Device or Mount Point* drop-down list contains the USB or Bluetooth
port name that _Subsurface_ needs in order to communicate with the dive
computer. The appropriate port name must be selected. Consult
xref:_appendix_a_operating_system_specific_information_for_importing_dive_information_from_a_dive_computer[Appendix
A] and
xref:_appendix_b_dive_computer_specific_information_for_importing_dive_information[Appendix
B] for technical details on how to find the appropriate port information for
a particular dive computer and, in some cases, how to do the correct
settings to the operating system of the computer on which _Subsurface_ is
running.
- If all the dives on the dive computer need to be downloaded, check the
checkbox _Force download of all dives_. Normally, _Subsurface_ only
downloads dives after the date-time of the last dive in the *Dive List*
panel. If one or more of your dives in _Subsurface_ have been accidentally
deleted or if there are older dives that still need to be downloaded from
the dive computer, this checkbox needs to be activated. Some dive computers
(e.g. Mares Puck) do not provide a contents list to _Subsurface_ before the
download in order to select only new dives. Consequently, for these dive
computers, all dives are downloaded irrespective of the status of this check
box.
- If the checkbox _Always prefer downloaded dives_ has been checked and,
during download, dives with identical date-times exist on the dive computer
and on the _Subsurface_ *Dive List* panel, the dive in the _Subsurface_
divelog will be overwritten by the dive record from the dive computer
- The checkbox marked _Download into new trip_ ensures that, after upload, the
downloaded dives are grouped together as a new trip(s) in the *Dive List*.
- Do *not* check the checkboxes labelled _Save libdivecomputer logfile_ and
_Save libdivecomputer dumpfile_. These are only used as diagnostic tools
when problems with downloads are experienced (see below).
- Then select the _Download_ button. After successful download, Dialogue *B*
in the figure above appears.
- With communication established, one can see how the data are retrieved from
the dive computer. Depending on the make of the dive computer and/or number
of recorded dives, this could take some time. Be patient. The _Download_
dialogue shows a progress bar at the bottom of the dialogue (for some dive
computers the progress information could be inaccurate as we cannot
determine how much downloadable data there is until all data have been
downloaded). When the download of the dive information is complete, all the
imported dives appear in the *Dive List*, sorted by date and
time. Disconnect and switch off the dive computer to conserve its battery
power. If a particular dive is selected, the *Dive Profile* panel shows an
informative graph of dive depth against time for that particular dive.
After the dives have been downloaded, they appear in a tabular format on the
righthand side of the dialogue (see image *B*, above). Each dive comprises a
row in the table, with the date, duration and depth shown. Next to each dive
is a checkbox: check all the dives that need to be transfered to the *Dive
List*. In the case of the image above, the last six dives are checked and
will be transfered to the *Dive List*.
After this has been completed, select the OK button. The checked dives are
transfered to the *Dive List*.
- If there is a problem in communicating with the dive computer, an error
message will be shown, similar to this text: "Unable to open /dev/ttyUSB0
Mares (Puck Pro)". Refer to the text in the box below.
****
*PROBLEMS WITH DATA DOWNLOAD FROM A DIVE COMPUTER?*
[icon="images/icons/important.png"]
[IMPORTANT]
Check the following:
- Is the dive computer still in PC-communication or Upload mode?
- Is the battery of the dive computer fully charged? If not then the battery
must be charged or replaced.
- Is the connecting cable faulty? Does the cable work perfectly using other
software? Has it worked before, or is this the first time the cable is being
used? Are the contacts on the dive computer and the cable clean?
- Consult
xref:_appendix_a_operating_system_specific_information_for_importing_dive_information_from_a_dive_computer[Appendix
A] and make sure that the correct Mount Point was specified (see above).
- On Unix-like operating systems, does the user have write permission to the
USB port? If not, consult
xref:_appendix_a_operating_system_specific_information_for_importing_dive_information_from_a_dive_computer[Appendix
A]
If the _Subsurface_ computer does not recognise the USB adaptor by showing
an appropriate device name next to the Mount Point, then there is a
possibility that the cable or USB adaptor is faulty. A faulty cable is the
most common cause of communication failure between dive computer and
_Subsurface_ computer. It is also possible that the _Subsurface_ computer
cannot interpret the data. Perform a download for diagnostic purposes with
the following two check boxes checked in the download dialogue discussed
above:
Save libdivecomputer logfile
Save libdivecomputer dumpfile
*Important*: These check boxes are only used when problems are encountered
during the download process: under normal circumstances they should not be checked.
When checking these boxes, the user is prompted to select a folder to
save the information to. The default folder is the one in which the _Subsurface_
dive log is kept.
*Important:* _After downloading with the above checkboxes
checked, no dives are added to the
*Dive List* but two files are created in the folder selected above_:
subsurface.log
subsurface.bin
These files should be send to the _Subsurface_ mail list:
_subsurface@subsurface-divelog.org_ with a request for the files to be
analysed. Provide the dive computer make and model as well as contextual
information about the dives recorded on the dive computer.
****
[[S_DeviceNames]]
==== Changing the name of a dive computer
It may be necessary to distinguish between different dive computers used to
upload dive logs to _Subsurface_. For instance if one's partner's dive
computer is the same make and model as one's own and dive logs are uploaded
from both dive computers to the same _Subsurface_ computer, then one would
perhaps like to call one dc "Alice's Suunto D4" and the other one "Bob's
Suunto D4". Alternatively, perhaps a technical diver dives with two or more
dive computers of the same model, the logs of both (or all) being uploaded.
In this case it might be prudent to call one of them "Suunto D4 (1)" and
another one "Suunto D4 (2)". This is easily done in _Subsurface_. On the
*Main Menu*, select _Log -> Edit device names_. A dialog opens, indicating
the current Model, ID and Nickname of the dive computers used for
upload. Edit the Nickname field for the appropriate dive computer. After
saving the Nickname, the dive logs show the nickname for that particular
device instead of the model name, allowing easy identification of devices.
[[S_EditDiveInfo]]
==== Updating the dive information imported from the dive computer.
With the uploaded dives in the *Dive List*, the information from the dive
computer is not complete and more details must be added in order to have a
fuller record of the dives. To do this, the *Notes* and the *Equipment*
tabs on the top left hand of the _Subsurface_ window should be used.
==== Notes de plongée
The date and time of the dive, gas mixture and (often) water temperature are
usually shown as obtained from the dive computer, but the user needs to add
additional information by hand in order to have a more complete dive
record. In a few cases, (e.g. APD rebreathers) one also has to provide the
date and time of the dive. If the contents of this tab is changed or edited
in any way, the message in a blue box at the top of the panel indicates that
the dive is being edited. If one clicks on the *Notes* tab, the
following fields are visible:
image::images/AddDive3_f20.jpg["FIGURE: The Notes tab", align="center"]
The *Time* field reflects the date and time of the dive. By clicking the
date, a calendar is displayed from which one can choose the correct
date. Press ESC to close the calendar. The time values (hour and minutes)
can also be edited directly by clicking on each of them in the text box and
by overtyping the information displayed.
*Air/water temperatures*: Air and water temperatures during the dive are shown
in these fields to the right of the Start time. Many dive computers supply water
temperature information and this field may therefore contain information obtained from the dive computer.
If air temperature is not provided by the dive computer, the first temperature reading
might be used for the air temperature. Generally this is close enough to the real air temperature as
the change in the temperature sensor reading is quite slow to follow the changes in the environment.
If editing is required, only a value is required, the units of temperature will be
automatically supplied by
_Subsurface_ (according to the _Preferences_, metric or imperial units will
be used).
*Location*: In this field one should type in text that describes the site
where the dive was performed, e.g. "Tihany, Lake Balaton, Hungary".
Auto completion of location names will
make this easier if one frequently dives at the same sites.
*Coordinates*: The geographic coordinates of the dive site should be entered
here. These can come from three sources:
a. The user can find the coordinates on the world map in the bottom right hand
part of the Subsurface window. The map displays a green bar indicating "Move
the map and double-click to set the dive location". Double-click at the
appropriate place, the green bar disappears and the coordinates are stored.
b. The user can obtain the coordinates from the _Subsurface_ Companion app if
an Android or iPhone device with GPS was used and if the coordinates of the
dive site were stored using that device. xref:S_Companion[Click here for
more information]
c. The coordinates can be entered by hand if they are known, using one of four
formats with latitude followed by longitude:
ISO 6709 Annex D format e.g. 30°13'28.9"N 30°49'1.5"E Degrees and decimal
minutes, e.g. N30° 13.49760' , E30° 49.30788' Degrees minutes seconds,
e.g. N30° 13' 29.8" , E30° 49' 1.5" Decimal degrees, e.g. 30.22496 ,
30.821798
Southern hemisphere latitudes are given with a *S*, e.g. S30°, or with a
negative value, e.g. -30.22496. Similarly, western longitudes are given with
a *W*, e.g. W07°, or with a negative value, e.g. -7.34323.
Please note that GPS coordinates of a dive site are linked to the Location
name - so adding coordinates to dives that do not have a location
description will cause unexpected behaviour (Subsurface will think that all
of these dives have the same location and try to keep their GPS coordinates
the same).
*Dive mode*: This is a dropdown box allowing one to choose the type of dive
performed. The options are OC (Open Circuit, the default seting, meant for most recreational dives),
Freedive (dive without SCUBA equipment), CCR (Closed-circuit
rebreather) and pSCR (Passive semi-closed rebreather).
*Divemaster*: The name of the dive master or dive guide for this dive should be
entered in this field
which offers auto completion based on the list of dive masters in
the current logbook.
*Buddy*: In this field, one enters the name(s) of the buddy / buddies
(separated with commas) who accompanied him/her on the
dive. Auto completion based on the list of buddies in the current logbook is
offered.
*Suit*: Here the type of diving suit used for the dive can be entered.
Auto completion of the suit description is available.
Some dry-suit users may choose to use this field to record what combination of
suit and thermal protection undersuit was used.
*Rating*: One can provide a subjective overall rating of the dive on a
5-point scale by clicking the appropriate star on the rating scale.
*Visibility*: Similarly, one can provide a rating of visibility during the
dive on a
5-point scale by clicking the appropriate star.
*Tags*: Tags that describe the type of dive performed can be entered
here (separated by commas). Examples of common tags are boat, drift, training,
cave, etc.
_Subsurface_ has many built-in tags. If the user starts typing a tag, the
program
will list the tags that correspond to the typing. For instance, if the user
typed
+cav+, then the tags *cave* and *cavern* are shown for the user to choose from.
*Notes*: Any additional information for the dive can be entered here.
The *Save* and *Cancel* buttons are used to save all the information for
tabs in the info panel and in the dive profile panel, so there's no need to
use them until ALL other information has been added. Here is an example of a
completed Notes panel:
image::images/CompletedDiveInfo_f20.jpg["FIGURE: A completed Notes tab", align="center"]
==== Equipment
The Equipment tab allows one to enter information about the type of cylinder
and gas used as well as the weights used for the dive. The message in a blue
box at the top of the panel:
image::images/BlueEditBar_f20.jpg["FIGURE: Blue edit bar", align="center"]
indicates that the dive is being edited. This is a highly interactive part
of _Subsurface_ and the information on cylinders and gases (entered here)
determines the behaviour of the dive profile (top right-hand panel).
[[cylinder_definitions]]
*Cylinders*: The cylinder information is entered through a dialogue that looks
like this:
image::images/DC_gas-dialogue1_f20.jpg["FIGURE: Initial cylinder dialogue", align="center"]
In most cases _Subsurface_ obtains the gas used from the dive computer and
automatically inserts the gas composition(% oxygen) in the table. The +
button at the top right allows the user to add more cylinders for this
dive. The dark dustbin icon on the left allows the deletion of information
for a cylinder. Note that it is not possible to delete a cylinder if it is
used during the dive. A cylinder might be implicitly used in the dive, even
without a gas change event.
The user should start by selecting a cylinder type on the left-hand side of
the table. To select a cylinder, the *cylinder type* box should be
clicked. This brings up a list button that can be used to display a dropdown
list of cylinders:
image::images/DC_gas-dialogue2_f20.jpg["FIGURE: The cylinder drop-down list button", align="center"]
The drop-down list can then be used to select the cylinder type that was
used for this dive or the user may start typing in the box which shows the
available options for the entered characters. The *Size* of the cylinder as
well as its working pressure (*WorkPress*) will automatically be shown in
the dialogue.
Next one must indicate the starting pressure and the ending pressure of the
specified gas during the dive. The unit of pressure (metric/imperial)
corresponds to the settings chosen in the _Preferences_.
Finally, provide the gas mixture used. If air was used, the value of 21% can
be entered or this field can be left blank. If nitrox or trimix were used,
their percentages of oxygen and/or helium should be entered. Any
inappropriate fields should be left empty. After typing the information for
the cylinder, either press _ENTER_ on the keyboard or click outside the cell
that contains the cursor. Information for any additional cylinders can be
added by using the + button at the top right hand. Following is an example
of a complete description for a dive using two cylinders (air and EAN50):
image::images/CylinderDataEntry3_f20.jpg["FIGURE: a completed cylinder dive information table", align="center"]
*Weights*: Information about the weight system used can be entered
using a dialogue very similar to that of the cylinder information. If one
clicks
the + button on the top right of the weights dialogue, the table looks like
this:
image::images/WeightsDataEntry1_f20.jpg["FIGURE:The Weights dialogue", align="center"]
By clicking on the *Type* field, a drop-down list becomes accessible through
a down-arrow:
image::images/WeightsDataEntry2_f20.jpg["FIGURE:Weights type drop-down list button", align="center"]
The drop-down list can then be used to select the type of weight system used
during the dive or the user may start typing in the box which shows the
available options for the entered characters. In the *Weight* field, type
in the amount of weight used during the dive. After specifying the weight
system, the user can either press _ENTER_ on the keyboard or click outside
the cell with the cursor. It is possible to enter information for more than
one weight system by adding an additional system using the + button on the
top right hand. Weight systems can be deleted using the dustbin icon on the
left hand. Here is an example of information for a dive with two types of
weights: integrated as well as a weight belt:
image::images/WeightsDataEntry3_f20.jpg["FIGURE: A completed weights information table", align="center"]
==== Editing several selected dives simultaneously
_METHOD 1_: After uploading dives from a dive computer, the dive profiles of
the uploaded dives are shown in the *Dive profile* tab, as well as a few
items of information in the *Notes* tab (e.g. water temperature) and in
the *Equipment* tab (e.g. gas pressures and gas composition). However the
other fields remain empty. It may be useful to simultaneously edit some of
the fields in the *Notes* and *Equipment* tabs. For instance, it is
possible that a diver performed several dives during a single day, using
identical equipment while diving at the same dive site or with the same dive
master and/or buddy or tags. Instead of completing the information for each
of these dives separately, one can select all the dives for that day in the
*Dive List* and insert the same information in the *Notes* and
*Equipment* fields that need identical information. This is achieved by
editing the dive notes or the equipment for any one of the selected dives.
The simultaneous editing only works with fields that do not already contain
information. This means that, if some fields have been edited for a
particular dive among the selected dives, these are not changed while
editing the dives simultaneously. Technically, the rule for editing several
dives simultaneously is: if the data field being edited contains _exactly
the same information_ for all the dives that have been selected, the new,
edited information is substituted for all the selected dives, otherwise only
the edited dive is changed, even though several dives have been selected in
the *Dive List*. This greatly speeds up the completion of the dive log after
several similar dives.
[[S_CopyComponents]]
_METHOD 2_:There is a different way of achieving the same goal. Select a
dive with all the appropriate information typed into the *Notes* and
*Equipment* tabs. Then, from the main menu, select _Log -> Copy dive
components_. A box is presented with a selection of check boxes for most of
the fields in the *Notes* and *Equipment* tabs. Select the fields to
be copied from the currently selected dive, then select _OK_. Now, in the
*Dive List*, select the dives into which this information is to be
pasted. Then, from the main menu, select _Log -> Paste dive components_.
All the selected dives now contain the data initially selected in the
original source dive log.
==== Adding Bookmarks to a dive
Many divers wish to annotate their dives with text that indicate particular
events during the dive, e.g. "Saw dolphins", or "Released surface
buoy". This is easily done:
- Right-click at the appropriate point on the dive profile. This brings up
the dive profile context menu. Select _Add bookmark_. A red flag is placed
on the dive profile at the point that was initially selected (see *A*
below).
- Right-click on the red flag. This brings up the context menu (see *B*
below). Select _Edit name_.
- A text box is shown. Type the explanatory text for the bookmark (see *C*
below). Select _OK_. This saves the text associated with the bookmark.
- If one hovers using the mouse over the red bookmark, the appropriate text is
shown at the bottom of the information box (see *D* below).
image::images/Bookmarks.jpg["FIGURE: Bookmark dialog", align="center"]
==== Saving the updated dive information
The information entered in the *Notes* tab and the *Equipment* tab can
be saved by using the two buttons on the top right hand of the *Notes*
tab. If the _Save_ button is clicked, the dive data are saved. If the
_Cancel_ button is clicked, then the newly entered dive data are deleted,
although the dive profile obtained from the dive computer will be
retained. When the user exits _Subsurface_ there is a final prompt to
confirm that the new data should be saved.
=== Importing dive information from other digital data sources or other data formats
[[S_ImportingAlienDiveLogs]]
If a user has been diving for some time, it is possible that several dives
were logged using other dive log software. This information does not need
retyping because these dive logs can probably be imported into
_Subsurface_. _Subsurface_ will import dive logs from a range of other dive
log software. While some software is supported natively, for others the user
has to export the logbook(s) to an intermediate format so that they can then
be imported by _Subsurface_. Currently, _Subsurface_ supports importing CSV
log files from several sources. APD LogViewer, XP5, Sensus and Seabear
files are preconfigured, but because the import is flexible, users can
configure their own imports. Manually kept log files (e.g. in spreadsheet)
can also be imported by configuring the CSV import. _Subsurface_ can also
import UDDF and UDCF files used by some divelog software and some dive
computers, like the Heinrichs & Weikamp DR5. Finally, for some divelog
software like Mares Dive Organiser it is currently suggested to import the
logbooks first into a webservice like _divelogs.de_ and then import them
from there with _Subsurface_, as divelogs.de supports a few additional
logbook formats that _Subsurface_ currently cannot parse.
If the format of other software is supported natively on Subsurface, it
should be sufficient to select either _Import -> Import log files_ or _File
-> Open log file_. _Subsurface_ supports the data formats of many dive
computers, including Suunto and Shearwater. When importing dives,
_Subsurface_ tries to detect multiple records for the same dive and merges
the information as best as it can. If there are no time zone issues (or
other reasons that would cause the beginning time of the dives to be
significantly different) _Subsurface_ will not create duplicate entries.
==== Using the universal import dialogue
[[Unified_import]]
Importing dives from other software is performed through a universal
interface that is activated by selecting _Import_ from the Main Menu, then
clicking on _Import Log Files_. This brings up the dialogue *A* below.
image::images/Import1_f20.jpg["FIGURE: Import dialogue: step 1", align="center"]
Towards the bottom right is a dropdown selector with a default label of
_Dive Log Files_ which gives access to the different types of direct imports
available, as in dialogue *B*, above. Currently these are:
- XML-formatted dive logs (DivingLog 5.0, MacDive and several other dive log
systems)
- UDDF-formatted dive logs (e.g. Kenozoooid)
- UDCF-formatted dive logs
- Poseidon MkVI CCR logs
- JDiveLog
- Suunto Dive Manager (DM3 and DM4)
- CSV (text-based and spreadsheet-based) dive logs, including APD CCR logs
Selecting the appropriate file in the file list of the dialogue opens the
imported dive log in the _Subsurface_ *Dive List*. Some other formats, not
accessible through the Import dialogue are also supported, as explained
below.
==== Importing from Mares Dive Organiser V2.1
Since Mares utilise proprietary Windows software not compatible with
multi-platform applications, these dive logs cannot be directly imported
into _Subsurface_. Mares dive logs need to be imported using a three-step
process, using _www.divelogs.de_ as a mechanism to extract the dive log
information.
1. The dive log data from Mares Dive Organiser need to be exported to the
user's desktop, using a _.sdf_ file name extension. Refer to
xref:Mares_Export[Appendix C] for more information.
2. Data should then be imported into _www.divelogs.de_. One needs to create a
user account in _www.divelogs.de_, log into that web site, then select
_Import Logbook -> Dive Organiser_ from the menu on the left hand side. The
instructions must be carefully followed to transfer the dive information (in
_.sdf_ format) from the Dive Organiser database to _www.divelogs.de_.
3. Finally, import the dives from _divelogs.de_ to _Subsurface_, using the
instructions below.
[[S_ImportingDivelogsDe]]
==== Importing dives from *divelogs.de*
The import of dive information from _divelogs.de_ is simple, using a single
dialogue box. The _Import -> Import from Divelogs.de_ option should be
selected from the Main Menu. This brings up a dialogue box (see figure on
left [*A*] below). Enter a user-ID and password for _divelogs.de_ into the
appropriate fields and then select the _Download_ button. Download from
_divelogs.de_ starts immediately, displaying a progress bar in the dialogue
box. At the end of the download, the success status is indicated (see figure
on the right [*B*], below). The _Apply_ button should then be selected,
after which the imported dives appear in the _Subsurface_ *Dive List* panel.
image::images/Divelogs1.jpg["FIGURE:Download from Divelogs.de", align="center"]
[[S_ImportingCSVData]]
==== Importing data in CSV format
A comma-separated file (.csv) can be used to import dive information either
as dive profiles (as in the case of the APD Inspiration and Evolution closed
circuit rebreathers) or as dive metadata (in case the user keeps dive data
in a spreadsheet). The _CSV_ format is a universal simplified format that
allows for easy information exchange between different computers or software
packages. For an introduction to CSV-formatted files see xref:S_CSV_Intro[A
Diver's Introduction To CSV Files]. _Subsurface_ dive logs can also be
exported in _CSV_ format to other software that reads this format. See
xref:S_Appendix_D[APPENDIX D: Exporting a spreadsheet to CSV format] for
information that may be helpful for importing spreadsheet-based data into
_Subsurface_.
[[S_ImportingCSVDives]]
===== Importing dives in CSV format from dive computers or other dive log software
One can view a _CSV_ file by using an ordinary text editor. It is normally
organised into a single line that provides the headers (or _field names_ or
_column headings_) of the data columns, followed by the data, one record per
line.
There are two types of _CSV_ dive logs that can be imported into
_Subsurface_:
1. _CSV dive details_: This dive log format contains similar information to
that of a typical written dive log, e.g. dive date and time, dive depth,
dive duration, names of buddy and dive master and perhaps some information
about cylinder pressures before and after the dive, as well as a comment or
two about the dive. All the data for a single dive go on a single line of
text, following the order of the column headings.
2. _CSV dive profile_: This dive log format includes much more information
about a single dive. For instance there may be information at 30-second
intervals, indicating depth, water temperature at that depth, and cylinder
pressure at that moment in time. Each line contains the information for a
single instant in time during the dive, 30 seconds after that of the
previous instant. Many lines are required to complete the depth profile
information for a single dive. This is a common export format used by
closed-circuit rebreather (CCR) dive equipment and many software packages
that handle dive computer data and/or dive logs.
Before being able to import the _CSV_ data to _Subsurface_ *one needs to
know a few things about the data being imported*:
a. Which character separates the different columns within a single line of
data? This field separator should be either a comma (,) or a TAB character.
This can be determined by opening the file with a text editor. If it is
comma-delimited, then the comma characters between the values are clearly
visible. If no commas are evident and the numbers are aligned in columns,
the file is probably TAB-delimited (i.e. it uses a TAB as a field
separator).
b. Which data columns need to be imported into _Subsurface_? Is it a _CSV dive
details_ file or a _CSV dive profile_ file? Open the file using a text
editor and note the titles of the columns to be imported and their column
positions.
c. Is the numeric information (e.g. dive depth) in metric or in imperial unis?
Armed with this information, importing the data into _Subsurface_ is
straightforward. Select _Import -> Import Log Files_ from the main menu. In
the resulting file selection menu, select _CSV files_ (towards the bottom
right). This shows all .CSV files in the selected directory. Select the file
that needs to be imported. A configuration panel appears as depicted below:
image::images/csv_import1_f20.jpg["FIGURE: CSV download dialogue 1", align="center"]
Notice that, at the top left, there is a dropdown list containing
pre-configured settings for some of the more common dive computers and
software packages encountered by divers. If the _CSV_ file being imported
originated from any of these pre-configured items, then select it. Otherwise
use the _Manual Import_ option. The configuration panel also has dropdown
lists for the specification of the appropriate field separator (Tab, comma
or semicolon), the date format used in the _CSV_ file, the time units
(seconds, minutes or minutes:seconds), as well as the unit system (metric or
imperial). Selecting the appropriate options among these is critical for the
successful import of the data.
The last remaining task is to ensure that all the data columns have the
appropriate column headings. The top line of the white part of the data
table contains the column headings found in the _CSV_ data file. The blue
row of cells immediately above these contains the names understood by
_Subsurface_. The white area below the dropdown lists contains all the field
names that _Subsurface_ recognises. These names are in blue balloons and can
be moved using a drag-and-frop action. For instance, _Subsurface_ expects
the column heading for Dive number (" # ") to be "Dive # ". If the column
heading that _Subsurface_ expects is not in the blue cells, then drag the
appropriate column heading from the upper area and drop it in the
appropriate blue cell at the top of the table. To indicate the correct
column for "Dive #", drag the ballooned item labelled "Dive # " and drop it
in the blue cell immediately above the white cell containing " # ". This is
depicted in the image below.
image::images/csv_import2_f20.jpg["FIGURE: CSV download dialogue 2", align="center"]
Continue in this way to ensure that all the column headings in the blue row
of cells correspond to the headings listed in the top part of the
dialogue. Having completed this task, select the _OK_ button to the bottom
right og the dialogue. The data from the _CSV_ file are imported and shown
in the *Dive List* panel.
[[S_CSV_Intro]]
****
*A Diver's Introduction to _CSV_ Files*
[icon="images/icons/important.png"]
[IMPORTANT]
_CSV_ is an abbreviation for a data file format: _Comma-Separated
Variables_. It is a file format allowing someone to view or edit the
information using a text editor such as Notebook (Windows), gedit (Linux) or
TextWrangler (OS/X). The two main advantages of the _CSV_ format is that the
data are easily editable as text without any proprietary software and
ensuring all information is human-readable, not being obscured by any custom
or proprietary attributes that proprietary software insert into files.
Because of its simplicity the _CSV_ format is used as an interchange format
between many software packages, e.g. between spreadsheet, statistical,
graphics, database and diving software. Within _Subsurface_, _CSV_ files can
also be used to import information from other sources such as
spreadsheet-based dive logs and even from some dive computers.
_CSV_ files can be created or edited with a normal text editor. The most
important attribute of a _CSV_ file is the _field separator_, the character
used to separate fields within a single line. The field separator is
frequently a comma, a colon, a SPACE character or a TAB character. When
exporting data from spreadsheet software, the field separator needs to be
specified in order to create the _CSV_ file. _CSV_ files are normally
organised into a single line that provides the headers (or _field names_) of
the data columns, followed by the data, one record per line. Note that each
field name may comprise more than one word separated by spaces; for instance
_Dive site_, below. Here is an example of dive information for four dives
using a comma as a field separator:
Dive site,Dive date,Time,Dive_duration, Dive_depth,Dive buddy
Illovo Beach,2012-11-23,10:45,46:15,18.4,John Smith
Key Largo,2012-11-24,09:12,34:15,20.4,Jason McDonald
Wismar Baltic,2012-12-01,10:13,35:27,15.4,Dieter Albrecht
Pulau Weh,2012-12-20,09:46,55:56,38.6,Karaeng Bontonompo
In this format the data are not easily read by a human. Here is the same
information in TAB-delimited format:
Dive site Dive date Time Dive_duration Dive_depth Dive buddy
Illovo Beach 2012-11-23 10:45 46:15 18.4 John Smith
Key Largo 2012-11-24 09:12 34:15 20.4 Jason McDonald
Wismar Baltic 2012-12-01 10:13 35:27 15.4 Dieter Albrecht
Pulau Weh 2012-12-20 09:46 55:56 38.6 Karaeng Bontonompo
It is clear why many people prefer the TAB-delimited format to the
comma-delimited format. The disadvantage is that one cannot see the TAB
characters. For instance, the space between _Dive_ and _date_ in the top
line may be a SPACE character or a TAB character (in this case it is a SPACE
character: the tabs are before and after _Dive date_). If the field names in
the first line are long, the alignment with data in the other lines cannot
be maintained. Here is a highly simplified and shortened TAB-delimited
example of a _CSV_ dive log from an APD closed-circuit rebreather (CCR) dive
computer:
Dive Time (s) Depth (m) pO₂ - Setpoint (Bar) pO₂ - C1 Cell 1 (Bar) Ambient temp. (Celsius)
0 0.0 0.70 0.81 13.1
0 1.2 0.70 0.71 13.1
0 0.0 0.70 0.71 13.1
0 1.2 0.70 0.71 13.2
0 1.2 0.70 0.71 13.1
10 1.6 0.70 0.72 12.7
20 1.6 0.70 0.71 12.6
30 1.7 0.70 0.71 12.6
40 1.8 0.70 0.68 12.5
When a _CSV_ file is selected for import, _Subsurface_ displays the column
headers as well as some of the data in the first few lines of the _CSV_
file, making it much easier to work with _CSV_ files. _CSV_ files can
therefore be used in many contexts for importing data into a _Subsurface_
dive log. Knowledge of a few basic things about the content of the _CSV_
file allows a smooth import of the dives into _Subsurface_.
****
[icon="images/icons/important.png"]
[IMPORTANT]
The _CSV_ import has a couple of caveats. One should avoid some special
characters like ampersand (&), less than (<), greater than (>) and double
quotes (") as part of the numbers or text within a cell. The file should use
UTF-8 character set, if using non-ASCII characters. Also the size of the
_CSV_ file might cause problems. Importing 100 dives at a time (_CSV dive
details_) works, but larger files might exceed limits of the parser
used. When encountering problems with _CSV_ imports, first try with a
smaller file to make sure everything works.
[[S_Companion]]
=== Importing GPS coordinates with the _Subsurface Companion App_ for mobile phones
Using the *Subsurface Companion App* on an _Android device_ with a GPS or
xref:S_iphone[_iPhone_], the coordinates for the diving location can be
automatically passed to the _Subsurface_ dive log. The Companion App stores
the dive locations on a dedicated Internet-based file server. _Subsurface_,
in turn, can collect the localities from the file server.
To do this:
==== Create a Companion App account
- Register on the http://api.hohndel.org/login/[_Subsurface companion web
page_]. A confirmation email with instructions and a personal *DIVERID*
will be sent, a long number that gives access to the file server and
Companion App capabilities.
- Download the app from
https://play.google.com/store/apps/details?id=org.subsurface[Google Play
Store] or from
http://f-droid.org/repository/browse/?fdfilter=subsurface&fdid=org.subsurface[F-Droid].
==== Using the Subsurface companion app on an Android smartphone
On first use the app has three options:
* _Create a new account._ Equivalent to registering in _Subsurface_ companion
page using an Internet browser. One can request a *DIVERID* using this
option, but this is supplied via email and followed up by interaction with
the http://api.hohndel.org/login/[_Subsurface companion web page_] in order
to activate the account.
* _Retrieve an account._ If users forgot their *DIVERID* they will receive an
email to recover the number.
* _Use an existing account._ Users are prompted for their *DIVERID*. The app
saves this *DIVERID* and does not ask for it again unless one uses the
_Disconnect_ menu option (see below).
[icon="images/icons/important.png"]
[IMPORTANT]
In the _Subsurface_ main program, the *DIVERID* should also be entered on
the Default Preferences panel, obtained by selecting _File -> Preferences ->
Defaults_ from the main menu in _Subsurface_ itself. This facilitates
synchronisation between _Subsurface_ and the Companion App.
===== Creating new dive locations
Now one is ready to get a dive position and send it to the server. The
Android display will look like the left hand image (*A*) below, but without
any dives.
Touch the "+" icon on the top right to add a new dive site, a menu will be
showed with 3 options:
* Current: A prompt for a place name (or a request to activate the GPS if it
is turned off) will be displayed, after which the current location is saved.
* Use Map: This option allows the user to fix a position by searching a world
map. A world map is shown (see *B* below) on which one should indicate the
desired position with a _long press_ on the touch sensitive screen (if the
marked location is erroneous, simply indicate a new location) and select
the check symbol in the upper right. A dialog is shown allowing to enter the
name of the dive location and the date-time of the dive (see *C* below). In
order to import this dive location in _Subsurface_ it's advisable to set the
time to agree with the time of that dive on the dive computer.
image::images/Companion_5.jpg["FIGURE: Companion App, add location using map", align="center"]
* Import local GPX file: The android device searches for .gpx files and
located archives will be shown. The selected .gpx file is opened and the
stored locations shown. Now one needs to select the appropriate locations,
then select the tab in the upper right, after which the locations will be
sent to the web service and added to the list on the Android device.
===== Dive lists of dive locations
The main screen shows a list of dive locations, each with a name, date and
time (see *A* below). Some locations may have an arrow-up icon over the
selection box to the left indicating that they require upload to the
server. One can select individual dive locations from the list. A selected
location has a check mark in the selection box on the left. Group operations
(such as _Delete_ or _Send_) are performed on several locations that are
selected.
Dive locations in this list can be viewed in two ways: a list of locations
or a map indicating the dive locations. The display mode (List or Map) is
changed by selecting _Dives_ at the top left of the screen (see *A* below)
and then selecting the display mode. The display mode can be changed either
from the list of locations or from the map (see *B* below). If one selects a
location (on the list or on the map), an editing panel opens (see *C* below)
where the dive description or other details may be changed.
image::images/Companion_4.jpg["FIGURE: Companion App, add location using map", align="center"]
When one clicks on a dive (*not* selecting the check box), the name given to
it, date/time and GPS coordinates will be shown, with two options at the top
of the screen:
- Edit (pencil): Change the text name or other characteristics of the dive
location.
- Maps: Display a map showing the dive location.
After editing and saving a dive location (see *C* above), one needs to
upload it to the web service, as explained below.
===== Uploading dive locations
There are several ways to send locations to the server. The easiest is by
simply selecting the locations (See *A* below) and then touching the right
arrow at the top right of the screen.
[icon="images/icons/important.png"]
[IMPORTANT]
Users must be careful, as the trash icon on the right means exactly what it
should; it deletes the selected dive location(s).
image::images/Companion_1.jpg["FIGURE: Screen shots (A-B) of companion app", align="center"]
After a dive trip using the Companion App, all dive locations are ready to
be downloaded to a _Subsurface_ dive log (see below).
===== Settings on the Companion app
Selecting the _Settings_ menu option results in the right hand image above
(*B*).
===== Server and account
- _Web-service URL._ This is predefined (http://api.hohndel.org/)
- _User ID._ The DIVERID obtained by registering as described above. The
easiest way to obtain it is simply to copy and paste from the confirmation
email but, of course, users can also type this information.
===== Synchronisation
- _Synchronize on startup._ If selected, dive locations in the Android device
and those on the web service synchronise each time the app is started.
- _Upload new dives._ If selected, each time the user adds a dive location it
is automatically sent to the server.
===== Background service
Instead of entering a unique dive location, users can leave the service
running in the background of their Android device, allowing the continuous
collection of GPS locations.
The settings below define the behaviour of the service:
- _Min duration._ In minutes. The app will try to get a location every X
minutes until stopped by the user.
- _Min distance._ In meters. Minimum distance between two locations.
- _Name template._ The name the app will use when saving the locations.
[icon="images/icons/info.jpg"]
[TIP]
_How does the background service work?_ Assuming the user sets 5 minutes and
50 meters in the settings above, the app will start by recording a location
at the current location, followed by another one at every 5 minutes *or*
every time one moves 50m from previous location. If subsequent locations
are within a radius of 50 meters from the previous one, a new location is
not saved. If the user is not moving, only one location is saved, but if the
user is moving, a trace of the route is obtained by saving a location every
50 meters.
===== Other
_Mailing List._ The mail box for _Subsurface_. Users can send an email to
the Subsurface mailing list.
- _Subsurface website._ A link to the URL of Subsurface web
- _Version._ Displays the current version of the Companion App.
===== Search
Search the saved dive locations by name or by date and time.
===== Start service
Initiates the _background service_ following the previously defined
settings.
===== Disconnect
This is a badly named option that disconnects the app from the server by
resetting the user ID in the app, showing the first screen where an account
can be created, retrieve the ID for an existing account or use the users own
ID. The disconnect option is useful if a user's Android device was used to
download the dive locations of another registered diver.
===== Send all locations
This option sends all locations stored in the Android device to the server.
[[S_iphone]]
==== Using the Subsurface companion app on an _iPhone_ to record dive locations
The iPhone interface is quite simple. One needs to type the user ID
(obtained during registration) into the space reserved for it, then select
"Dive in" (see left part of the image below) and start collecting dive
location information.
image::images/iphone.jpg["FIGURE: Using iPhone companion application", align="center", width=640]
Dives can be added automatically or manually. In manual mode, a dive
location or waypoint is added to the GPS input stream. In automatic mode, a
continuous path of GPS locations is created from which, much later, after
import, subsurface can select the appropriate GPS locations based on the
times of dives. The default mode for the _iphone_ is automatic. When one
adds a dive, the location service is started automatically and a red bar
appears at the bottom of the screen. After the dive one can click on the red
bar to end the location service. While the location service is running one
can only add dives using the manual mechanism.
One can edit the site name afterwards by selecting the dive from the dive
list and clicking on the site name. There are no other editable fields. The
dive list is automatically uploaded from the iphone to the webservice and
there is not an option to trigger upload manually.
==== Downloading dive locations to the _Subsurface_ divelog
Download dive(s) from a dive computer or enter them manually into
_Subsurface_ before obtaining the GPS coordinates from the server. The
download dialog can be reached via _Ctrl+G_ or from the _Subsurface_ Main
Menu _Import -> Import GPS data from Subsurface Service_, resulting in the
image on the left (*A*), below. On first use the DIVERID text box is
blank. Provide a DIVERID, then select the _Download_ button to initiate the
download process, after which the screen on the right (*B*) below appears:
image::images/DownloadGPS.jpg["FIGURE: Downloading Companion app GPS data", align="center"]
Note that the _Apply_ button is now active. By clicking on it, users can
update the locations of the newly entered or uploaded dives in _Subsurface_
which applies the coordinates and names entered on the app for all the new
dives that match the date-times of the uploaded GPS localities. If one has
entered the name of the dive location in _Subsurface_ before downloading the
GPS coordinates, this name will take precedence over downloaded one.
Since _Subsurface_ matches GPS locations from the Android device and dive
information from the dive computer based on date-time data, automatic
assignment of GPS data to dives is dependent on agreement of the date-time
information between these two devices. Although _Subsurface_ has a wide
range tolerance, it may be unable to identify the appropriate dive if there
is a large difference between the time in the dive computer and that of the
Android device, resulting in no updates.
Similar date-times may not always be possible and there may be many reasons
for this (e.g. time zones), or _Subsurface_ may be unable to decide which is
the correct position for a dive (e.g. on repetitive dives while running
_background service_ there may be several locations that would be included
in the time range that fit not only the first dive, but one or more
subsequent dives as well). A workaround for this situation to manually edit
the date-time of a dive in the _Subsurface_ Dive List *before* downloading
the GPS data and then to change the date-time back again *after* downloading
GPS data.
[icon="images/icons/info.jpg"]
[NOTE]
TIPS:
- _Background service_, being a very powerful tool, may fill the location list
with many unnecessary locations not corresponding to the exact dive point
but reflecting the boat's route. Currently these locations are difficult to
delete from the server. In some situations it is therefore prudent to clean
up the list on the Android device before sending the dive points to the web
server by simply deleting the inappropriate locations. This might be
necessary, for instance, if one wants to keep the location list clear to see
dives in the web service map display (see above).
- It may also make sense to give informative names to the locations sent to
the web server, or at least to use an informative name in the _Name
Template_ setting while running the _background service_, especially on a
dive trip with many dives and dive locations.
[[S_LoadImage]]
=== Adding photographs to dives
Many (if not most) divers take a camera with them and take photographs
during a dive. One would like to associate each photograph with a specific
dive. _Subsurface_ allows one to load photos into a dive. Photos are
superimposed on the dive profile, from where they can be viewed.
==== Loading photos and getting synchronisation between dive computer and camera
Left-lick on a dive or on a group of dives on the dive list. Then
right-click on this dive or group of dives and choose the option _Load
Images_:
image::images/LoadImage1_f20.jpg["FIGURE: Load images option", align="center"]
The system file browser appears. Select the folder and photographs that need
to be loaded into _Subsurface_ and click the _Open_ button.
image::images/LoadImage2_f20.jpg["FIGURE: Load images option", align="center"]
This brings one to the time synchronisation dialog, shown below. The
critical problem is that the time synchronisation is not perfect between the
dive computer used during a dive, and the camera used during that same
dive. These two devices often differ by several minutes. If _Subsurface_ can
achieve synchronisation, then the exact times of photographs can be used to
position photographs on the dive profile.
_Subsurface_ achieves this synchronisation in two ways:
- *Manually*: If the user wrote down the exact camera time at the start of a dive, the
difference in time between the two devices can be determined. Actually, as long as the device
settings for time has not been changed in either device, one could write down the times of
both devices after the dive or even at the end of the day. One can then manually set the time
difference in the _Time shift_ dialog. Towards the top of the dialog is a time setting tool
immediately under the heading _Shift times of image(s) by_, evident in figure *A* below.
If the camera time is 7 minutes later than that of the dive computer, set the time setting
tool to a value of 00:07. Select either the _earlier_ or _later_ radio button.
In the above example, the _earlier_ option is appropriate, since the photos need to be shifted
7 minutes earlier (camera is 7 minutes ahead of dive computer). Ignore any "AM" or "PM" suffix
in that tool. Click the _OK_ button and synchronisation is achieved.
image::images/LoadImage3b_f20.jpg["FIGURE: Synchronisation dialog", align="center"]
- *By photograph*: There is a very slick way of achieving synchronisation. If one takes a
photograph of the face of the dive computer showing the time, then _Subsurface_ can obtain
the exact time the photograph was taken, using the metadata that the camera stores within
each photo. In order to do this, use the bottom half of the Time shift_ dialog. If one uses
the bottom part, the top part of the dialog is ignored. Click on
the horizontal bar entitled "_Select image of divecomputer showing time_. This brings up
a file browser with which one can select the photograph of the dive computer. Select the
photograph using the file browser and click on _OK_. This photograph of the dive computer
appears in the bottom panel of the _Shift times_ dialog. Now _Subsurface_ knows exactly
when the photograph has been taken. Now set the date-time dialog to the left of the photo
so that this tool reflects the date and time of the dive computer in the photo. When the
date-time tool has been set, _Subsurface_ knows exactly what the time difference between
camera and dive computer is, and synchronisation is achieved. There is a
photograph with the face of the dive computer and with the date-time tool set to the
date-time on image *B* above.
If the timestamp of a photograph is long before or after the dive, it is not
placed on the dive profile. If the timestamp of the photo is within 30
minutes of the dive, it is shown.
==== Viewing the photos
In order to view the photos added to a dive, activate the _show-photos_
button in the tool bar to the left of the dive profile:
image::images/icons/ShowPhotos_f20.png["FIGURE:Show photos toolbar button", align="left"]
After the images have been loaded, they appear in two places:
- the _Photos_ tab of the *Notes* panel.
- as tiny icons (stubs) on the dive profile at the appropriate positions
reflecting the time each photograph was taken. See below:
image::images/LoadImage4_f20.jpg["FIGURE: Photos on dive profile", align="center"]
If one hovers with the mouse over any of the photo icons, then a thumbnail
photo is shown of the appropriate photo. See the image below:
image::images/LoadImage5_f20.jpg["FIGURE:Thumbnail photo on dive profile", align="center"]
Clicking on the thumbnail brings up a full size photo overlaid on the
_Subsurface_ window. This allows good viewing of the photographs that have
been added (see the image below). Note that the thumbnail has a small
dustbin icon in the bottom right hand corner (see image above). If one
selects the dustbin, the image is removed from the dive. Therefore some care
is required when clicking on a thumbnail. Images can also be deleted using
the _Photos_ tab (see text below).
image::images/LoadImage6_f20.jpg["FIGURE: Full-screen photo on dive profile", align="center"]
==== The _Photos_ tab
Photographs associated with a dive are shown as thumbnails in the _Photos_
tab of the _Notes_ panel. Photos taken in rapid succession during a
dive (therefore sometimes with large overlap on the dive profile) can easily
be accessed in the _Photos_ tab. This tab serves as a tool for individually
accessing the photos of a dive, while the stubs on the dive profile give an
indication of when during a dive a photo was taken. By single-clicking on a
thumbnail in the _Photos_ panel, a photo is selected. By double-clicking a
thumbnail, the full-sized image is shown, overlaying the _Subsurface_
window. A photo can be deleted from the _Photos_ panel by selecting it
(single-click) and then by pressing the _Del_ key on the keyboard. This
removes the photo both from the _Photos_ tab as well as the dive profile.
==== Photos on an external hard disk
Most underwater photographers store their photos on an external drive. If
such a drive can be mapped (almost always the case) the photos can be
directly accessed by _Subsurface_. This facilitates the interaction between
_Subsurface_ and an external repository of photos. When associating a dive
profile with photos from an external drive, the normal procedure of
selection and synchronisation (see text above) is used. However, after the
external drive has been disconnected, _Subsurface_ cannot access these
photos any more. If the display of photos is activated (using the toolbox
to the left of the _Dive Profile_), the program only shows a small white dot
where each photo should be on the dive profile. In addition the _Photos_
tab only shows the file names of the photos. This is normal behaviour. If,
later, the external drive with the photos is connected again, the photos can
be seen in the normal way.
=== Logging special types of dives
[[S_MulticylinderDives]]
==== Multicylinder dives
_Subsurface_ easily handles dives involving more than one
cylinder. Multicylinder diving usually happens (a) if a diver does not have
enough gas for the complete dive in a single cylinder; (b) if the diver
needs more than one gas mixture because of the depth or the decompression
needs of the dive. For this reason multicylinder dives are often used by
technical divers who dive deep or long. As far as _Subsurface_ is concerned,
there are only two types of information that need to be provided:
- *Describe the cylinders used during the dive* This is performed in the *Equipment tab* of
the *Info* panel, as xref:cylinder_definitions[described above]. Enter the cylinders one by one,
specifying the characteristics of the cylinder and the gas composition within each cylinder.
- *Record the times at which switches from one cylinder to another was done:* This is information
provided by some dive computers (provided the diver indicated these changes to the dive computer
by pressing specific buttons). If the dive computer does not provide the information, the diver has to
record these changes using a different method, e.g. writing it on a slate.
- *Record the cylinder changes on the dive profile*: If the latter option
was followed, the diver needs to indicate the gas change event by right-clicking at the appropriate point
in time on the *Dive Profile* panel and indicating the cylinder to which the change was made. After
right-clicking, follow the context menu to "Add gas change" and select the appropriate cylinder from
those defined during the first step, above (see image below). If the
*tank bar* button in the ttolbar has been activated, the cylinder switches are also indicated in the
tank bar.
Having performed these tasks, _Subsurface_ indicates the appropriate use of
cylinders in the dive profile. Below is a multi-cylinder dive, starting off
with EAN28, then changing cylinders to EAN50 after 26 minutes to perform
decompression.
image::images/multicylinder_dive.jpg["FIGURE: Multicylinder profile", align="center"]
==== Sidemount dives
Sidemount diving is just another form of multicylinder diving, often with
both or all cylinders having the same gas mixture. Although it is a popular
configuration for cave divers, sidemount diving can be performed by
recreational divers who have completed the appropriate training. Sidemount
dive logging involves, exactly as with multicylinder dives, above, three
steps:
- *During the dive, record cylinder switch events*. Since sidemount diving normally involves two
cylinders with air or with the same gas mixture, _Subsurface_ distinguishes among these different
cylinders. In contrast, most dive computers that allow gas switching only distinguish among different
_gases_ used, not among different _cylinders_ used. This means that when sidemount dives are downloaded
from these dive computers, the events of switching between cylinders with the same gas are not downloaded. This may mean
that one may have to keep a written log of cylinder switch times using a slate, or (if the dive computer
has this facility) marking each cylinder switch with a bookmark that can be retrieved later. Returning
from a dive with the information about cylinder changes is the only tricky part of logging sidemount dives.
- *Within _Subsurface_ describe the cylinders used during the dive*. The diver needs to provide the
specifications of the different cylinders, using the *Equipment* tab of the *Info Panel* (see
image below where two 12 litre cylinder were used).
- *Indicate cylinder change events on the _Subsurface_ dive profile*. Once the dive log has been imported
from a dive computer into _Subsurface_, the cylinder switch events need to be indicated on the dive profile.
Cylinder changes are recorded by right-clicking at the appropriate point on the dive profile and then
selecting _Add gas change_. A list of the appropriate cylinders is shown with the
currently used cylinder greyed out. In the image below Tank 1 is greyed out, leaving only Tank 2
to be selected. Select the appropriate cylinder. The cylinder change is then indicated on the dive
profile with a cylinder symbol. If the *Tank Bar* is activated using the toolbar to the left of the
profile, then the cylinder change is also indicated on the Tank Bar (see image below). After all
the cylinder change events have been recorded on the dive profile, the correct cylinder pressures
for both cylinders are shown on the dive profile, as inthe image below.
image::images/sidemount1.jpg["FIGURE: Sidemount profile", align="center"]
This section gives an example of the versatility of _Subsurface_ as a give
logging tool.
[[S_sSCR_dives]]
==== Semi-closed circuit rebreather (SCR) dives
[icon="images/halcyon_RB80.jpg"]
[NOTE]
Passive semi-closed rebreathers (pSCR) comprise a technical advance in
diving equipment that recirculates the breathing gas that a diver breathes,
while removing carbon dioxide from the exhaled gas. While a small amount
(typically a tenth) of the exhaled breathing gas is released into the water,
a small amount of fresh gas is released from the back gas cylinder
(typically containing nitrox). A diver, using a single cylinder of
breathing gas can therefore dive for much longer periods than using a
recreational open-circuit configuration. With pSCR equipment, a very small
amount of breathing gas is released every time the breather inhales. With
active SCR (aSCR) equipment, in contrast, a small amount of breathing gas is
released continuously from the back cylinder.
To log pSCR dives, no special procedures are required, just the normal steps
outlined above:
- Select pSCR in the _Dive Mode_ dropdown list on the *Info* panel.
- pSCR diving often involves gas changes, requiring an additional cylinder.
Define all the appropriate cylinders as described above and indicate the
cylinder/gas changes as described above in the section on
xref:S_MulticylinderDives[multicylinder dives].
If a pSCR _Dive Mode_ has been selected, the dive ceiling for pSCR dives is
adjusted for the oxygen drop accross the mouthpiece which often requires
longer decompression periods. Below is a dive profile of a pSCR dive using
EAN36 on the back cylinder and oxygen for decompression. Note that this dive
lasted over two hours.
image::images/pSCR_profile.jpg["FIGURE: pSCR profile", align="center"]
[[S_CCR_dives]]
==== Closed circuit rebreather (CCR) dives
[icon="images/APD.jpg"]
[NOTE]
Closed system rebreathers use advanced technology to recirculate gas that
has been breathed while doing two things to maintain a breathable oxygen
concentration:
a) remove carbon dioxide from the gas that has been exhaled
regulate the oxygen concentration to remain within safe diving limits.
Currently, within _Subsurface_, the Poseidon MkVI Discovery is the best
supported CCR dive computer. The CCR interface of _Subsurface_ is currently
experimental and under active development. In contrast to a conventional
recreational dive computer, a CCR system computer does not allow the
download of a log containing multiple dives. Rather, each dive is stored
independently. This means that _Subsurface_ cannot download a dive log
directly from a CCR dive computer, but that it imports CCR dive logs in the
same way that it imports dive log data from other digital databases.
===== Import a CCR dive
See the section dealing with xref:S_ImportingAlienDiveLogs[Importing dive
information from other digital sources]. From the main menu of _Subsurface_,
select _Import -> Import log files_ to bring up the
xref:Unified_import[universal import dialogue]. As explained in that
section, the bottom right hand of the import dialogue contains a dropdown
list of appropriate devices that currently includes an option for (Poseidon)
MkVI files (import for other CCR equipment is under active
development). Having selected the appropriate CCR format and the directory
where the original dive logs have been stored from the CCR dive computer,
one can select a particular dive log file (in the case of the MkVI it is a
file with a .txt extension). After selecting the appropriate dive log,
activate the _Open_ button at the bottom right hand of the universal import
dialogue.
===== Displayed information for a CCR dive
_Partial pressures of gases_: The graph of oxygen partial pressure shows the
information from the oxygen sensors of the CCR equipment. In contrast to
recreational equipment (where pO~2~ values are calculated based on gas
composition and dive depth), CCR equipment provide actual measurements of
pO~2~, derived from oxygen sensors. In this case the graph for oxygen
partial pressure should be fairly flat, reflecting the setpoint settings
during the dive. The mean pO~2~ is NOT the mean oxygen partial pressure as
given by the CCR equipment, but a value calculated by _Subsurface_ as
follows:
- For TWO O~2~ sensors the mean value of the two sensors are given.
- For THREE-sensor systems (e.g. APD), the mean value is also used. However
differences of more than 0,1 bar in the simultaneous readings of different
sensors are treated as spurious. If one of the three sensors provides
spurious data, it is ignored.
- If no sensor data is available, the pO~2~ value is assumed to be equal to
the setpoint.
The mean pO~2~ of the sensors is indicated with a green line,
The oxygen setpoint values as well as the readings from the individual
oxygen sensors can be shown. The display of additional CCR information is
turned on by checking the appropriate checkboxes in the _Preferences_ panel
(accessible by selecting xref:S_CCR_options[_File -> Preferences ->
Graph_]). This part of the _Preferences_ panel look like this, representing
two checkboxes that modify the display of pO~2~ when the appropriate toolbar
button on the Dive Profile has been activated.
image::images/CCR_preferences_f20.jpg["FIGURE: CCR preferences panel", align="center"]
Checking any of the check boxes allows the display of additional
oxygen-related information whenever the pO~2~ toolbar button on the
_Profile_ panel is activated. The first checkbox allows the display of
setpoint information. This is a red line superimposed on the green oxygen
partial pressure graph and allows a comparison of the mean measured oxygen
partial pressure and the setpoint values, as in the image below.
image::images/CCR_setpoint_f20.jpg["FIGURE: CCR setpoint and po2 graph", align="center"]
The second checkbox allows the display of the data from each individual
oxygen sensor of the CCR equipment. The data for each sensor is colour-coded
as follows:
- Sensor 1: grey
- Sensor 2: blue
- Sensor 3: brown
The mean oxygen pO~2~ is indicated by the green line. This allows the direct
comparison of data from each of the oxygen sensors, useful for detecting
abnormally low or erratic readings from a particular sensor.
image::images/CCR_sensor_data_f20.jpg["FIGURE: CCR sensor data graph", align="center"]
The setpoint data can be overlaid on the oxygen sensor data by activating
both of the above check boxes. Partial pressures for nitrogen (and helium,
if applicable) are shown in the usual way as for open circuit dives.
_Events_: Several events are logged, e.g. switching the mouthpiece to open
circuit. These events are indicated by yellow triangles and, if one hovers
over a triangle, a description of that event is given as the bottom line in
the xref:S_InfoBox[Information Box].
_Cylinder pressures_: Some CCR dive computers like the Poseidon MkVI record
the pressures of the oxygen and diluent cylinders. The pressures of these
two cylinders are shown as green lines overlapping the depth profile. In
addition, start and end pressures for both oxygen and diluent cylinders are
shown in the _Equipment Tab_. Below is a dive profile for a CCR dive,
including an overaly of setpoint and oxygen sensor data, as well as the
cylinder pressure data. In this case there is good agreement from the
readings of the two oxygen sensors.
image::images/CCR_dive_profile_f20.jpg["FIGURE: CCR dive profile", align="center"]
_Equipment-specific information_: Equipment-specific information gathered by
_Subsurface_ is shown in the xref:S_ExtraDataTab[Extra data tab]. This may
include setup information or metadata about the dive.
More equipment-specific information for downloading CCR dive logs for
Poseidon MkVI and APD equipment can be found in xref:S_PoseidonMkVI[Appendix
B].
== Obtaining more information about dives entered into the logbook
=== The *Info* tab (for individual dives)
The Info tab gives some summary information about a particular dive
that has been selected in the *Dive List*. Useful information here includes
the surface interval before the dive, the maximum and mean depths of the
dive, the gas volume consumed, the surface air consumption (SAC) and the
number of oxygen toxicity units (OTU) incurred.
[icon="images/icons/info.jpg"]
[NOTE]
Gas consumption and SAC calculations: _Subsurface_ calculates SAC and Gas
consumption taking in account gas incompressibility, particularly at tank
pressures above 200 bar, making them more accurate. Users should refer to
xref:SAC_CALCULATION[Appendix D] for more information.
[[S_ExtraDataTab]]
=== The *Extra Data* tab (usually for individual dives)
When using a dive computer, it often reports several data items that cannot
easily be presented in a standardised way because the nature of the
information differs from one dive computer to another. These data often
comprise setup information, metadata about a dive, battery levels, no fly
times, or gradient factors used during the dive. When possible, this
information is presented in the *Extra Data* tab. Below is an image showing
extra data for a dive using a Poseidon rebreather.
image::images/ExtraDataTab_f20.jpg["FIGURE: Extra Data tab", align="center"]
=== The *Stats* tab (for groups of dives)
The Stats tab gives summary statistics for more than one dive, assuming that
more than one dive has been selected in the *Dive List* using the standard
Ctrl-click or Shift-click of the mouse. If only one dive has been selected,
figures pertaining to only that dive are given. This tab shows the number of
dives selected, the total amount of dive time in these dives, as well as the
minimum, maximum and mean for the dive duration, water temperature and
surface air consumption (SAC). It also shows the depth of the shallowest and
deepest dives of those selected.
[[S_DiveProfile]]
=== The *Dive Profile*
image::images/Profile2.jpg["Typical dive profile", align="center"]
Of all the panels in _Subsurface_, the Dive Profile contains the most
detailed information about each dive. The Dive Profile has a *button bar* on
the left hand side that allows control over several display options. The
functions of these buttons are described below. The main item in the Dive
Profile is the graph of dive depth as a function of time. In addition to the
obvious information of the depth it also shows the ascent and descent rates
compared to the recommended speed of going up or down in the water
column. This information is given using different colours:
|====================
|*Couleur*|*Vitesse de descente (m/min)*|*Vitesse de remontée (m/min)*
|Rouge|> 30|> 18
|Orange|18 - 30|9 - 18
|Jaune|9 - 18|4 - 9
|Vert clair|1.5 - 9|1.5 - 4
|Vert foncé|< 1.5|< 1.5
|=====================
The profile also includes depth readings for the peaks and troughs in the
graph. Thus, users should see the depth of the deepest point and other
peaks. Mean depth is plotted as a grey line, indicating mean dive depth up
to a particular moment during the dive.
[icon="images/icons/scale.jpg"]
[NOTE]
In some cases the dive profile does not fill the whole area of the *Dive
Profile* panel. Clicking the *Scale* button in the toolbar on the left of
the dive profile frequently increases the size of the dive profile to fill
the area of the panel efficiently.
*Water temperature* is displayed with its own blue line with temperature values
placed adjacent to significant changes.
The dive profile can include graphs of the *partial pressures* of O2, N2,
and He during the dive (see figure above) as well as a calculated and dive
computer reported deco ceilings (only visible for deep, long, or repetitive
dives). Partial pressures of oxygen are indicated in green, those of
nitrogen in black, and those of helium in dark red. These partial pressure
graphs are shown below the profile data.
[icon="images/icons/O2.jpg"]
[NOTE]
Clicking this button allows display of the partial pressure of *oxygen*
during the dive. This is depicted below the dive depth and water temperature
graphs.
[icon="images/icons/N2.jpg"]
[NOTE]
Clicking this button allows display of the partial pressure of *nitrogen*
during the dive.
[icon="images/icons/He.jpg"]
[NOTE]
Clicking this button allows display of the partial pressure of *helium*
during the dive. This is only of importance to divers using Trimix,
Helitrox or similar breathing gasses.
The *air consumption* graph displays the tank pressure and its change during
the dive. The air consumption takes depth into account so that even when
manually entering the start and end pressures the graph is not a straight
line. Similarly to the depth graph the slope of the tank pressure gives the
user information about the momentary SAC rate (Surface Air Consumption) when
using an air integrated dive computer. Here the colour coding is not
relative to some absolute values but relative to the average normalised air
consumption during the dive. So areas that are red or orange indicate times
of increased normalized air consumption while dark green reflects times when
the diver was using less gas than average.
[icon="images/icons/Heartbutton.png"]
[NOTE]
Clicking on the heart rate button will allow the display of heart rate
information during the dive if the dive computer was attached to a heart
rate sensor.
It is possible to *zoom* into the profile graph. This is done either by using
the scroll wheel / scroll gesture of your mouse or trackpad. By default
_Subsurface_ always shows a profile area large enough for at least 30 minutes
and 30m
(100ft) – this way short or shallow dives are intuitively recognizable;
something
that free divers clearly won’t care about.
image::images/MeasuringBar.png["FIGURE: Measuring Bar", align="center"]
[icon="images/icons/ruler.jpg"]
[NOTE]
Measurements of *depth or time differences* can be achieved by using the
*ruler button* on the left of the dive profile panel. The measurement is
done by dragging the red dots to the two points on the dive profile that the
user wishes to measure. Information is then given in the horizontal white
area underneath the two red dots.
[icon="images/icons/ShowPhotos.png"]
[NOTE]
Photographs that have been added to a dive can be shown on the profile by
selecting the *Show-photo* button. The position of a photo on the profile
indicates the exact time when this photo was taken. If this button is not
active, the photos are hidden.
The profile can also include the dive computer reported *ceiling* (more
precisely, the deepest deco stop that the dive computer calculated for each
particular moment in time) as a red overlay on the dive profile. Ascent
ceilings arise when a direct ascent to the surface increases the risk of a
diver suffering from decompression sickness (DCS) and it is necessary to
either ascend slower or to perform decompression stop(s) before ascending to
the surface. Not all dive computers record this information and make it
available for download; for example all of the Suunto dive computers fail to
make this very useful data available to divelog software. _Subsurface_ also
calculates ceilings independently, shown as a green overlay on the dive
profile. Because of the differences in algorithms used and amount of data
available (and other factors taken into consideration at the time of the
calculation) it is unlikely that ceilings from dive computers and from
_Subsurface_ are the same, even if the same algorithm and _gradient factors_
(see below) are used. It is also quite common that _Subsurface_ calculates
a ceiling for non-decompression dives when the dive computer stayed in
non-deco mode during the whole dive (represented by the [green]#dark green#
section in the profile at the beginning of this section). This is caused by
the fact that _Subsurface’s_ calculations describe the deco obligation at
each moment during a dive, while dive computers usually take the upcoming
ascent into account. During the ascent some excess nitrogen (and possibly
helium) are already breathed off so even though the diver technically
encountered a ceiling at depth, the dive still does not require an explicit
deco stop. This feature allows dive computers to offer longer non-stop
bottom times.
[icon="images/icons/cceiling.jpg"]
[NOTE]
If the dive computer itself calculates a ceiling and makes it available to
_Subsurface_ during upload of dives, this can be shown as a red area by
checking *Dive computer reported ceiling* button on the Profile Panel.
[icon="images/icons/ceiling1.jpg"]
[NOTE]
If the *Calculated ceiling* button on the Profile Panel is clicked, then a
ceiling, calculated by _Subsurface_, is shown in green if it exists for a
particular dive (*A* in figure below). This setting can be modified in two
ways:
[icon="images/icons/ceiling2.jpg"]
[NOTE]
If, in addition, the *show all tissues* button on the Profile Panel is
clicked, the ceiling is shown for the tissue compartments following the
Bühlmann model (*B* in figure below).
[icon="images/icons/ceiling3.jpg"]
[NOTE]
If, in addition, the *3m increments* button on the Profile Panel is clicked,
then the ceiling is indicated in 3 m increments (*C* in figure below).
image::images/Ceilings2.jpg["Figure: Ceiling with 3m resolution", align="center"]
[icon="images/icons/ShowCylindersButton.jpg"]
[NOTE]
By selecting this icon, the different cylinders used during a dive can be
represented as a coloured bar at the bottom of the *Dive Profile*. In
general oxygen is represented by a green bar, nitrogen with a yellow bar and
helium with a red bar. The image below shows a dive which first uses a
trimix cylinder (red and green), followed by a switch to a nitrox cylinder
(yellow and green) after 23 minutes. Cylinders with air are shown as a light
blue bar.
image::images/ShowCylinders_f20.jpg["Figure: Cylinder use graph", align="center"]
[icon="images/tissues.jpg"]
[NOTE]
Display inert gas tissue pressures relative to ambient inert gas pressure
(horizontal grey line). Tissue pressures are calculated using the Bühlmann
ZH-L16 algorithm and are displayed as lines ranging from green (faster
tissues) to blue (slower tissues). The black line, graphed above the
ambient pressure, is the maximum allowable tissue supersaturation (pressure
limit) derived from the gradient factors specified in the *Preferences*. For
divers involved in planned decompression diving, efficient rates of
offgasing are obtained with tissue pressures between the ambient inert gas
pressure (grey line) and the pressure limit (black line). This display is a
representation of the tissue pressures during the whole dive. In contast,
the xref:S_gas_pressure_graph[Gas Pressure Graph] in the *Information Box*
on the *Dive Profile* is an instantaneous reflection of tissue pressures at
the moment in time reflected by the position of the cursor on the dive
profile.
image::images/tissuesGraph.jpg["Figure: Inert gas tissue pressure graph", align="center"]
Gradient Factor settings strongly affect the calculated ceilings and their
depths. For more information about Gradient factors, see the section on
xref:S_GradientFactors[Gradient Factor Preference settings]. The currently
used gradient factors (e.g. GF 35/75) are shown above the depth profile if
the appropriate toolbar buttons are activated. *N.B.:* The indicated
gradient factors are NOT the gradient factors in use by the dive computer,
but those used by _Subsurface_ to calculate deco obligations during the
dive. For more information external to this manual see:
** http://www.tek-dive.com/portal/upload/M-Values.pdf[Understanding M-values by Erik Baker, _Immersed_ Vol. 3, No. 3.]
** link:http://www.rebreatherworld.com/general-and-new-to-rebreather-articles/5037-gradient-factors-for-dummies.html[Gradient factors for dummies, by Kevin Watts]
=== The Dive Profile context menu
The context menu for the Dive Profile is accessed by right-clicking while
the mouse cursor is over the Dive Profile panel. The menu allows the
creation of Bookmarks or Gas Change Event markers or manual CCR set-point
changes other than the ones that might have been imported from a Dive
Computer. Markers are placed against the depth profile line and with the
time of the event set by where the mouse cursor was when the right mouse
button was initially clicked to bring up the menu. Gas Change events involve
a selection of which gas is being switched to, the list of choices being
based on the available gases defined in the Equipment Tab. Set-point change
events open a dialog allowing to choose the next set-point value. As in the
planner, a set-point value of zero indicates the diver is breathing from an
open circuit system while any non-zero value indicates the use of a closed
circuit rebreather (CCR). By right-clicking while over an existing marker a
menu appears, adding options to allow deletion of the marker or to allow all
markers of that type to be hidden. Hidden events can be restored to view by
selecting Unhide all events from the context menu.
[[S_InfoBox]]
=== The *Information Box*
The Information box displays a large range of information pertaining to the
dive profile. Normally the Information Box is located to the top left of the
*Dive Profile* panel. If the mouse points outside of the *Dive Profile*
panel, then only the top line of the Information Box is visible (see
left-hand part of figure (*A*) below). The Information Box can be moved
around in the *Dive Profile* panel by click-dragging it with the mouse so
that it is not obstructing important detail. The position of the Information
Box is saved and used again during subsequent dive analyses.
image::images/InfoBox2.jpg["Figure: Information Box", align="center"]
The moment the mouse points inside the *Dive Profile* panel, the information
box expands and shows many data items. In this situation, the data reflect
the time point along the dive profile indicated by the mouse cursor (see
right-hand part of figure (*B*) above where the Information Box reflects the
situation at the position of the cursor [arrow] in that image). Therefore,
moving the cursor in the horizontal direction allows the Information Box to
show information for any point along the dive profile. In this mode, the
Information Box gives extensive statistics about depth, gas and ceiling
characteristics of the particular dive. These include: Time period into the
dive (indicated by a @), depth, cylinder pressure (P), temperature,
ascent/descent rate, surface air consumption (SAC), oxygen partial pressure,
maximum operating depth, equivalent air depth (EAD), equivalent narcotic
depth (END), equivalent air density depth (EADD), decompression requirements
at that instant in time (Deco), time to surface (TTS), the calculated
ceiling, as well as the calculated ceiling for several Bühlmann tissue
compartments.
The user has control over the display of several statistics, represented as
four buttons on the left of the profile panel. These are:
[icon="images/icons/MOD.jpg"]
[NOTE]
Clicking this button causes the Information Box to display the *Maximum
Operating Depth (MOD)* of the dive, given the gas mixture used. MOD is
dependent on the oxygen concentration in the breathing gas. For air (21%
oxygen) it is around 57 m. Below the MOD there is a markedly increased risk
of exposure to the dangers associated with oxygen toxicity.
[icon="images/icons/NDL.jpg"]
[NOTE]
Clicking this button causes the Information Box to display the *No-deco
Limit (NDL)* or the *Total Time to Surface (TTS)*. NDL is the time duration
that a diver can continue with a dive, given the present depth, that does
not require decompression (that is, before an ascent ceiling appears). Once
one has exceeded the NDL and decompression is required (that is, there is an
ascent ceiling above the diver, then TTS gives the number of minutes
required before the diver can surface. TTS includes ascent time as well as
decompression time.
[icon="images/icons/SAC.jpg"]
[NOTE]
Clicking this button causes the Information Box to display the *Surface Air
Consumption (SAC)*. SAC is an indication of the surface-normalised
respiration rate of a diver. The value of SAC is less than the real
respiration rate because a diver at 10m uses breathing gas at a rate roughly
double that of the equivalent rate at the surface. SAC gives an indication
of breathing gas consumption rate independent of the depth of the dive so
that the respiratory rates of different dives can be compared. The units for
SAC is litres/min or cub ft/min.
[icon="images/icons/EAD.jpg"]
[NOTE]
Clicking this button displays the *Equivalent Air Depth (EAD)* for nitrox
dives as well as the *Equivalent Narcotic Depth (END)* for trimix
dives. These are numbers of importance to divers who use breathing gases
other than air. Their values are dependent on the composition of the
breathing gas. The EAD is the depth of a hypothetical air dive that has the
same partial pressure of nitrogen as the current depth of the nitrox dive at
hand. A nitrox dive leads to the same decompression obligation as an air
dive to the depth equalling the EAD. The END is the depth of a hypothetical
air dive that has the same sum of partial pressures of the narcotic gases
nitrogen and oxygen as the current trimix dive. A trimix diver can expect
the same narcotic effect as a diver breathing air diving at a depth
equalling the END.
Figure (*B*) above shows an information box with a nearly complete set of
data.
[[S_gas_pressure_graph]]
==== The Gas Pressure Bar Graph
On the left of the *Information Box* is a vertical bar graph indicating the
pressures of the nitrogen (and other inert gases, e.g. helium, if
applicable) that the diver was inhaling _at a particular instant during the
dive_, indicated by the position of the cursor on the *Dive Profile*. The
drawing on the left below indicates the meaning of the different parts of
the Gas Pressure Bar Graph.
image::images/GasPressureBarGraph.jpg["FIGURE:Gas Pressure bar Graph", align="center"]
- The light green area indicates the total gas, with the top margin of the
light green area indicating the total gas pressure inhaled by the diver and
measured from the bottom of the graph to the top of the light green
area. This pressure has a _relative_ value in the graph and does not
indicate absolute pressure.
- The horizontal black line underneath the light green margin indicates the
equilibrium pressure of the inert gases inhaled by the diver, usually
nitrogen. In the case of trimix, it is the pressures of nitrogen and helium
combined. In this example, the user is diving with EAN32, so the inert gas
pressure is 68% of the distance from the bottom of the graph to the total
gas pressure value.
- The dark green area at the bottom of the graph represents the pressures of
inert gas in each of the 16 tissue compartments, following the Bühlmann
algorithm, the fast tissues being on the left hand side.
- The top black horizontal line indicates the gradient factor that applies to
the depth of the diver at the particular point on the *Dive Profile*. The
appropriate gradient factor is an interpolation between the FGLow and GFHigh
values specified in the Graph tab of the *Preferences Panel* of
*Subsurface*.
- The bottom margin of the red area in the graph indicates the Bühlman-derived
M-value, that is the pressure value of inert gases at which bubble formation
is expected to be severe, resulting in decompression sickness.
These five values are indicated on the left in the graph above. The way the
Gas Pressure Bar Graph changes during a dive is indicated on the right hand
side of the above figure for a diver using EAN32.
- Graph *A* indicates the situation at the start of a dive with diver at the
surface. The pressures in all the tissue compartments are still at the
equilibrium pressure because no diving has taken place.
- Graph *B* indicates the situation after a descent to 30 meters. Few of the
tissue compartments have had time to respond to the descent, their gas
pressures being far below the equilibrium gas pressure.
- Graph *C* represents the pressures after 30 minutes at 30 m. The fast
compartments have attained equilibrium (i.e. they have reached the hight of
the black line indicating the equilibrium pressure). The slower compartments
(towards the right) have not reached equilibrium and are in the process of
slowly increasing in pressure.
- Graph *D* shows the pressures after ascent to a depth of 4.5 meters. Since,
during ascent, the total inhaled gas pressure has decreased strongly from 4
bar to 1.45 bar, the pressures in the different tissue compartments now
exceed that of the total gas pressure and approaches the gradient factor
value (i.e. the top black horizontal line). Further ascent will result in
exceeding the gradient factor value (GFHigh), endangering the diver.
- Graph *E* indicates the situation after remaining at 4.5 meters for 10
minutes. The fast compartments have decreased in pressure. As expected, the
pressures in the slow compartments have not changed much. The pressures in
the fast compartments do not approach the GFHigh value any more and the
diver is safer than in the situation indicated in graph *D*.
== Organising the logbook (Manipulating groups of dives)
=== The Dive List context menu
Many actions within _Subsurface_ are dependent on a context menu used mostly
to manipulate groups of dives. The context menu is found by selecting a dive
or a group of dives and then right-clicking.
image::images/ContextMenu.jpg["Figure: Context Menu", align="center"]
The context menu is used in many manipulations described below.
==== Customising the information showed in the *Dive List* panel
image::images/DiveListOptions.jpg["Example: Dive list info options", align="center"]
The default information in the *Dive List* includes, for each dive,
Dive_number, Date, Rating, Dive_depth, Dive_duration and Dive_location. This
information can be controlled and changed by right-clicking on the header
bar of the *Dive List*. For instance, a right-click on the 'Date' header
brings up a list of items that can be shown in the dive list (see
above). Select an item to be shown in the *Dive List* or to be deleted from
the dive list, and the list is immediately updated accordingly. Preferences
for information shown in the *Dive List* is saved and used when _Subsurface_
is re-opened.
==== Selecting dives from a particular dive site
Many divers have long dive lists and it may be difficult to locate all the
dives at a particular site. By pressing _Ctl-F_ on the keyboard, a text box
is opened at the top left hand of the *Dive List*. Type the name of a dive
site in this text box and the *Dive List* is immediately filtered to show
only the dives for that site.
[[S_Renumber]]
=== Renumbering the dives
Dives are normally numbered incrementally from non-recent dives (low
sequence numbers) to recent dives (having the highest sequence numbers). The
numbering of the dives is not always consistent. For instance, when
non-recent dives are added to the dive list the numbering does not
automatically follow on because of the dives that are more recent in
date/time than the newly-added dive with an older date/time. Therefore, one
may sometimes need to renumber the dives. This is performed by selecting
(from the Main Menu) _Log -> Renumber_. Users are given a choice with
respect to the lowest sequence number to be used. Completing this operation
results in new sequence numbers (based on date/time) for the dives in the
*Dive List* panel.
[[S_Group]]
=== Grouping dives into trips and manipulating trips
For regular divers, the dive list can rapidly become very long. _Subsurface_
can group dives into _trips_. It performs this by grouping dives that have
date/times that are not separated in time by more than two days, thus
creating a single heading for each diving trip represented in the dive
log. Below is an ungrouped dive list (*A*, on the left) as well as the
corresponding grouped dive list comprising five dive trips (*B*, on the
right):
image::images/Group2.jpg["Figure: Grouping dives", align="center"]
Grouping into trips allows a rapid way of accessing individual dives without
having to scan a long lists of dives. In order to group the dives in a dive
list, (from the Main Menu) users must select _Log -> Autogroup_. The *Dive
List* panel now shows only the titles for the trips.
==== Editing the title and associated information for a particular trip
Normally, in the dive list, minimal information is included in the trip
title. More information about a trip can be added by selecting its trip
title from the *Dive List*. This shows a *Trip Notes* tab in the *Dive
Notes* panel. Here users can add or edit information about the date/time,
the trip location and any other general comments about the trip as a whole
(e.g. the dive company that was dived with, the general weather and surface
conditions during the trip, etc.). After entering this information, users
should select *Save* from the buttons at the top right of the *Trip Notes*
tab. The trip title in the *Dive List* panel should now reflect some of the
edited information.
==== Viewing the dives during a particular trip
Once the dives have been grouped into trips, users can expand one or more
trips by clicking the arrow-head on the left of each trip title. This
expands the selected trip, revealing the individual dives performed during
the trip.
==== Collapsing or expanding dive information for different trips
If a user right-clicks after selecting a particular trip in the dive list,
the resulting context menu allows several possibilities to expand or
collapse dives within trips. This includes expanding all trips, collapsing
all trips and collapsing all trips except the selected one.
==== Merging dives from more than one trip into a single trip
By right-clicking on a selected trip title in the *Dive List* panel, a
context menu shows up that allows the merging of trips by either merging of
the selected trip with the trip below or with the trip above.
==== Splitting a single trip into more than one trip
If a trip includes five dives, the user can split this trip into two trips
(trip 1: top 3 dives; trip 2: bottom 2 dives) by selecting and
right-clicking the top three dives. The resulting context menu allows the
user to create a new trip by choosing the option *Create new trip
above*. The top three dives are then grouped into a separate trip. The
figures below shows the selection and context menu on the left (A) and the
completed action on the right (B):
image::images/SplitDive3a.jpg["FIGURE: Split a trip into 2 trips", align="center"]
=== Manipulating single dives
==== Delete a dive from the dive log
Dives can be permanently deleted from the dive log by selecting and
right-clicking them to bring up the context menu, and then selecting *Delete
dive(s)*. Typically this would apply to a case where a user wishes to delete
workshop calibration dives of the dive computer or dives of extremely short
duration.
==== Unlink a dive from a trip
Users can unlink dives from the trip to which they belong. In order to do
this, select and right-click the relevant dives to bring up the context
menu. Then select the option *Remove dive(s) from trip*. The dive(s) now
appear immediately above the trip to which they belonged.
==== Add a dive to the trip immediately above
Selected dives can be moved from the trip to which they belong and placed
within the trip immediately above the currently active trip. To do this,
select and right-click the dive(s) to bring up the context menu, and then
select *Add dive(s) to trip immediately above*.
==== Shift the start time of dive(s)
Sometimes it is necessary to adjust the start time of a dive. This may apply
to situations where dives are performed in different time zones or when the
dive computer has an erroneous time. In order to do this, user must select
and right-click the dive(s) to be adjusted. This action brings up the
context menu on which the *Shift times* option should be selected. User must
then specify the time (in hours and minutes) by which the dives should be
adjusted and click on the option indicating whether the time adjustment
should be forwards or backwards.
==== Merge dives into a single dive
Sometimes a dive is briefly interrupted, e.g. if a diver returns to the
surface for a few minutes, resulting in two or more dives being recorded by
the dive computer and appearing as different dives in the *Dive List*
panel. Users can merge these dives onto a single dive by selecting the
appropriate dives, right-clicking them to bring up the context menu and then
selecting *Merge selected dives*. It may be necessary to edit the dive
information in the *Notes* panel to reflect events or conditions that
apply to the merged dive. The figure below shows the depth profile of two
such dives that were merged:
image::images/MergedDive.png["Example: Merged dive", align="center"]
[[S_Filter]]
=== Filtering the dive list
The dives in the *Dive List* panel can be filtered, that is, one can select
only some of the dives based on their attributes, e.g. dive tags, dive site,
dive master, buddy or protective clothing. For instance, filtering allows
one to list the deep dives at a particular dive site, or otherwise the cave
dives with a particular buddy.
To open the filter, select _Log -> Filter divelist_ from the main menu. This
opens the _Filter Panel_ at the top of the _Subsurface_ window. Three icons
are located at the top right hand of the filter panel. The _Filter Panel_
can be reset (i.e. all current filters cleared) by selecting the *+*. The
_Filter Panel_ may also be minimised by selecting the middle icon. When
minimised, only these three icons are shown. The panel can be maximised by
clicking the icon that minimised the panel. The filter may also be reset and
closed by selecting the button with the flag. An example of the _Filter
Panel_ is shown in the figure below.
image::images/Filterpanel.jpg["Figure: Filter panel", align="center"]
Four filter criteria may be used to filter the dive list: dive tags, person
(buddy / dive master), dive site and dive suit, each of which is represented
by a check list with check boxes. Above each check list is a second-level
filter tool, allowing the listing of only some of the attributes within that
check list. For instance, typing "_ca_" in the filter textbox above the tags
check list results in the tags check list being reduced to "_cave_" and
"_cavern_". Filtering of the check list enables the rapid finding of search
terms for filtering the dive list.
To activate filtering of the dive list, the check box of at least one item
in one of the four check lists needs to be checked. The dive list is then
shortened to include only the dives that pertain to the selection criteria
specified in the check lists. The four check lists work as a filter with
_AND_ operators, Subsurface filters therefore for _cave_ as a tag AND _Joe
Smith_ as a buddy; but the filters within a category are inclusive -
filtering for _cave_ and _boat_ shows those dives that have either one or
both of these tags.
[[S_ExportLog]]
== Exporting the dive log or parts of the dive log
There are two routes for the export of dive information from Subsurface:
- Exporter les informations de plongée vers _Facebook_
- xref:S_Export_other[Exporter des informations de plongée vers d'autres
destinations ou formats]
[[S_facebook]]
=== Export des informations de plongée vers _Facebook_
L'export des plongées vers _Facebook_ est géré différemment des autres types
d'export. Cela est du au fait que l'export vers _Facebook_ nécessite une
connexion vers _Facebook_, nécessitant un identifiant et un mot de passe. À
partir du menu principal, si vous sélectionnez _Fichier -> Préférences ->
Facebook_, un écran de connexion est présenté (voir l'image *A* sur la
gauche, ci dessous). Entrez vos identifiant et mot de passe _Facebook_. Une
fois connecté à _Facebook_, le panneau de l'image *B* ci dessous est
présenté. Ce panneau a un bouton qui doit être sélectionné pour fermer la
connexion _Facebook_.
image::images/facebook1_f20.jpg["Figure: Facebook login", align="center"]
Having established a login to _Facebook_, transfer of a dive profile to
one's _Facebook_ timeline is easy. A _Facebook_ icon appears in the *Dive
Notes* panel of _Subsurface_ (See image *A* below). Ensure that the dive
that you want to transfer to the timeline is depicted in the _Subsurface_
*Dive Profile* panel. Select the _Facebook_ icon, and a dialogue is shown,
determining the amount of additional information transferred with the dive
profile (see image *B*, below). In order to transfer a dive profile to
_Facebook_, the name of a _Facebook_ album needs to be provided. The
checkboxes on the lefthand side allow one to determine how much additional
information should be transferred with the dive profile. This information is
shown in the text box on the right hand side of the panel (see image *B*,
below). You can easily edit the message that will be posted right there in
the text box. Having specified the additional information and verified the
text you want to post, select the _OK_ button which triggers the transfer to
_Facebook_. After a while, an acknowledgement dialogue appears, indicating
successful transfer to _Facebook_.
Both the Album created and the post to your time line will be marked as
private. In order for friends to be able to see the post you have to change
its permissions from a regular Facebook login either in a browser or a
Facebook app. While this is an extra step the developers felt that this was
the better solution to avoid having unwanted posts in your public timeline.
image::images/facebook2_f20.jpg["Figure: Facebook login", align="center"]
If required, then close the _Facebook_ connection by either closing
_Subsurface_ or by selecting _File -> Preferences -> Facebook_ from the Main
Menu, and clicking the appropriate button on the Facebook Preferences panel.
[[S_Export_other]]
=== Export dive information to other destinations or formats
For non-_Facebook exports_, the export function can be reached by selecting
_File -> Export_, which brings up the Export dialog. This dialog always
gives two options: save ALL dives, or save only the dives selected in *Dive
List* panel of _Subsurface_. Click the appropriate radio button (see images
below).
image::images/Export_f20.jpg["Figure: Export dialog", align="center"]
A dive log or part of it can be saved in three formats:
* _Subsurface XML_ format. This is the native format used by _Subsurface_.
* Universal Dive Data Format (_UDDF_). Refer to _http://uddf.org_ for more
information. UDDF is a generic format that enables communication among many
dive computers and computer programs.
* _Divelogs.de_, an Internet-based dive log repository. In order to upload to
_Divelogs.de_, one needs a user-ID as well as a password for
_Divelogs.de_. Log into _http://en.divelogs.de_ and subscribe to this
service in order to upload dive log data from _Subsurface_.
* _DiveShare_ is also a dive log repostory on the Internet focusing on the
recreational dives. In order to upload dives one has to provide a used ID,
so registration with _http://scubadiveshare.com_ is required.
* _CSV dive details_, that includes the most critical information of the dive
profile. Included information of a dive is: dive number, date, time, buddy,
duration, depth, temperature and pressure: in short, most of the information
that recreational divers enter into handwritten log books.
* _CSV dive profile_, that includes a large amount of detail for each dive,
including the depth profile, temperature and pressure information of each
dive.
* _HTML_ format, in which the dive(s) are stored in HTML files, readable with
an Internet browser. Most modern web browsers are supported, but JavaScript
must be enabled. This HTML file is not intended to be edited by the users.
The HTML dive log contains most of the information and also contains a
search option to search the dive log. HTML export is specified on the second
tab of the Export dialog (image *B* above). A typical use of this option is
to export all one's dives to a smartphone or a tablet where it would serve
as a very portable record of dives useful for dive companies that wish to
verify the dive history of a diver. This does away with the need to carry
one's original logbook with one when doing dives with dive companies.
* _Worldmap_ format, an HTML file with a world map upon which each dive and
some information about it are indicated. This map is not editable. However,
if one selects any of the dive sites on the map, a summary of the dive is
available in text, as shown in the image below.
image::images/mapview_f20.jpg["Figure: HTML Map export view", align="center"]
* _Image depths_, which creates a text file that contains the file names of
all photos or images attached to any of the selected dives in the _Dive
List_, together with the depth under water where of each of those photos
were taken.
* _General Settings_, under the HTML tab, provides the following options:
** Subsurface Numbers: if this option is checked, the dive(s) are exported with the
numbers associated with them in Subsurface, Otherwise the dive(s) will be numbered
starting from 1.
** Export Yearly Statistics: if this option is checked, a yearly statistics table will
be attached with the HTML exports.
** Export List only: a list of dives will only be exported and the detailed dive
information will not be available.
* Under _Style Options_ some style-related options are available like font
size and theme.
Export to other formats can be achieved through third party facilities, for
instance _www.divelogs.de_.
[[S_Cloud_access]]
== Keeping a _Subsurface_ dive log in the Cloud
For each diver, dive log information is highly important. Not only is it a
record of diving activities for one's own pleasure, but it is important
information required for admission to further training courses or
(sometimes) even diving sites. The security of the dive log is therefore
critical. In order to have a dive log that is resistant to failure of a home
computer hard drive, loss or theft of equipment, the Cloud is an obvious
solution. This also has the added benefit that one can access one's dive log
from anywhere in the world without having to carry it with oneself. For this
reason, facilities such as _divelogs.de_ and _Diving Log_ offer facilities
to store dive log information on the Internet. Although _Subsurface_ does
not offer integrated Cloud storage of dive logs, it is simple to achieve
this using several of the existing facilities on the Internet.
For instance http://www.dropbox.com/[_Dropbox_] offers a free application
that allows files on the Dropbox servers to be seen as a local folder on
one's desktop computer.
image::images/Cloud.jpg["FIGURE: Dropbox folder", align="center"]
The _Dropbox_ program creates a copy of the _Dropbox_ Internet Cloud content
on one's desktop computer. When the computer is connected to the Internet,
the Internet content is automatically updated. Therefore both the _Open_ and
_Save_ of dive logs are done using the local copy of the dive log in the
local _Dropbox_ folder, so there's no need for a direct internet
connection. If the local copy is modified, e.g. by adding a dive, the remote
copy in the _Dropbox_ server in the Cloud will be automatically updated
whenever Internet access is available.
In this way a dive log in one's _Dropbox_ folder can be accessed seamlessly
from the Internet and can be accessed from any place with Internet
access. Currently there are no costs involved for this service. Dropbox
(Windows, Mac and Linux) can be installed by accessing the
http://www.dropbox.com/install[_Install Page on the Dropbox website_]
Alternatively one can use _Dropbox_ as a mechanism to backup one's dive
log. To Store a dive log in the Cloud, select _File -> Save as_ from the
_Subsurface_ main menu, navigate to the _Dropbox_ folder and select the
_Save_ button. To access the dive log in the Cloud, select _File -> Open
Logbook_ from the _Subsurface_ main menu and navigate to the dive log file
in the _Dropbox_ folder and select the _Open_ button.
Several paid services exist on the Internet (e.g. Google, Amazon) where the
same process could be used for the Cloud-based storage of dive logs.
[[S_PrintDivelog]]
== Printing a dive log
_Subsurface_ provides a simple interface to print a whole dive log or only a
few selected dives, including dive profiles and other contextual
information.
Before printing, two decisions are required:
- Should the whole dive log be printed or only part of it? If only part of the
dive log is required, then the user must select the required dives from the
*Dive List* panel.
- What gas partial pressure information is required on the dive profile? Users
should select the appropriate toggle-buttons on the button bar to the left
of the Dive Profile panel.
Now the print options should be selected to match the user's needs. To do
this, user should select _File -> Print_ from the Main menu. The following
dialogue appears (see the image on the left [A], below).
image::images/PrintDiveLog.jpg["FIGURE: Print dialogue", align="center"]
Under _Print type_ users need to select one of three options:
- Print the complete Dive List: to do this, _Table Print_ should be selected.
- Print the selected dives (dive profiles and all other information) at 6
dives per printed page: to do this, users should select _6 dives per page_.
- Print the selected dives (dive profiles and all other information) at 2
dives per printed page: to do this, users should select _2 dives per page_.
- Print the selected dives (dive profiles and all other information) at 1 dive
per printed page: to do this, users should select _1 dive per page_.
Under _Print options_ users need to select:
- Printing only the dives that have been selected from the dive list prior to
activating the print dialogue, achieved by checking the box _Print only
selected dives_.
- Printing in colour, achieved by checking the box with _Print in colour_.
The _Ordering_ affects the layout of the page (or part of it) for each
dive. The dive profile could be printed at the top of each dive, with the
textual information underneath, or it could be printed with the textual
information at the top with the dive profile underneath. Users should select
the appropriate option in the print dialogue. See the image below which has
a layout with text below the dive profile.
Users can _Preview_ the printed page by selecting the _Preview_ button on
the dialogue. After preview, changes to the options in the print dialogue
can be made, resulting in a layout that fits personal taste.
Next, select the _Print_ button in the dialogue. This activates the regular
print dialogue used by the user operating system (image [*B*] in the middle,
above), allowing them to choose a printer and to set its properties (image
[*C*] on the right, above). It is important to set the print resolution of
the printer to an appropriate value by changing the printer
properties. Finally, one can print the dives. Below is a (rather small)
example of the output for one particular page.
image::images/Printpreview.jpg["FIGURE: Print preview page", align="center"]
[[S_Configure]]
== Configurer un ordinateur de plongée
_Subsurface_ permet de configurer son ordinateur de plongée. Actuellement,
les familles d'ordinateurs supportés sont Heinrichs-Weikamp (OSTC 2, OSTC 3)
et Suunto Vyper (Stinger, Mosquito, D3, Vyper, Vytec, Cobra, Gekko et
Zoop). De nombreux paramètres de ces ordinateurs de plongée peuvent être
lues et modifiées. La première étape est de s'assurer que les pilotes pour
votre ordinateur de plongée sont installés et que le nom de périphérique de
l'ordinateur de plongée est connu. Voir
<<_appendix_a_operating_system_specific_information_for_importing_dive_information_from_a_dive_computer,APPENDIX
A>> pour plus d'informations sur la manière de procéder.
Une fois que l'ordinateur de plongée est connecté à _Subsurface_,
sélectionner _Fichier -> Configurer l'ordinateur de plongée_, à partir du
menu principal. Fournir le nom du périphérique dans le champ en haut du
panneau de configuration qui ouvre et sélectionne le bon modèle d'ordinateur
de plongée à partir du panneau à gauche (voir l'image ci-dessous).
image::images/Configure_dc_f20.jpg["FIGURE: Configure dive computer", align="center"]
En utilisant les boutons appropriés du panneau de configuration, les actions
suivantes peuvent être réalisées :
- *Récupérer les détails disponibles*. Cela charge la configuration existante à partir de l'ordinateur de plongée
dans _Subsurface_, en l'affichant dans le panneau de configuration.
- *Enregistrer les modifications sur le périphérique*. Cela change la configuration de l'ordinateur
de plongée pour correspondre aux informations affichées dans le panneau de configuration.
- *Sauvegarder*. Cela enregistre la configuration dans un fichier. _Subsurface_ demande
l'emplacement et le nom du fichier pour enregistrer les informations.
- *Restaurer une sauvegarde*. Cela charge les informations à partir d'un fichier de sauvegarde et l'affiche
dans le panneau de configuration.
- *Mettre à jour le firmware*. Si un nouveau firmware est disponible pour l'ordinateur de plongée,
il sera chargé dans l'ordinateur de plongée.
[[S_Preferences]]
== Setting user _Preferences_ for _Subsurface_
There are several settings within _Subsurface_ that the user can
specify. These are found when selecting _File -> Preferences_. The settings
are performed in five groups: *Defaults*, *Units*, *Graph*, *Language* and
*Network*. All five sections operate on the same principles: the user must
specify the settings that are to be changed, then these changes are saved
using the *Apply* button. After applying all the new settings users can then
leave the settings panel by selecting *OK*.
=== Defaults
There are several settings in the *Defaults* panel:
image::images/Pref1_f20.jpg["FIGURE: Preferences defaults page", align="center"]
** *Lists and tables*: Here one can specify the font type and font size of the
*Dive Table* panel. By decreasing the font size of the *Dive Table*, users can see more dives on a screen.
** *Dives*: For the _Default Dive File_ one need to specify the directory and
file name of one's
electronic dive log book. This is a file with filename extension .xml. When
launched, _Subsurface_ will automatically load the specified dive log book.
** *Display invalid*: Dives can be marked as invalid (when a user wishes to hide
dives that he/she don't consider valid dives, e.g. pool dives, but still want to
keep them in the dive log). This controls whether those dives are displayed in
the dive list.
** *Default cylinder*: Here users can specify the default cylinder listed in
the *Equipment* tab of the *Notes* panel.
** *Animations*: Some actions in showing the dive profile are performed using
animations. For instance, the axis values for depth and time change from dive to
dive. When viewing a different dive, these changes in axis characteristics do not
happen instantaneously, but are animated. The _Speed_ of animations can be controlled
by setting this slider
with faster animation speed to the left, with a 0 value representing no animation
at all.
** *Subsurface web service*: When one subscribes to the <<S_Companion,Subsurface web service>>, a very
long and hard-to-remember userID is issued. This is the place to save that userID. By
checking the option _Save User ID locally?_, one ensures that a local copy of that userID
is saved.
** *Clear all settings*: As indicated in the button below this heading, all settings are
cleared and set to default values.
=== Units
image::images/Pref2_f20.jpg["FIGURE: Preferences Units page", align="center"]
Here user can choose between metric and imperial units of depth, pressure,
volume, temperature and mass. By selecting the Metric or Imperial radio
button at the top, users can specify that all units are in the chosen
measurement system. Alternatively, if one selects the *Personalise* radio
button, units can be selected independently, with some units in the metric
system and others in imperial.
=== Graph
[[S_CCR_options]]
image::images/Pref3_f20.jpg["FIGURE: Preferences Graph page", align="center"]
[[S_GradientFactors]]
This panel allows two type of selections:
*Show*: Here users can specify the amount of information shown as part of
the dive profile:
** Thresholds: _Subsurface_ can display the nitrogen, oxygen and the helium partial pressures during
the dive. These are enabled using the toolbar on the left hand side of the *Dive Profile*
panel. For each of these graphs users can specify a threshold value on the right-hand side of the
Preferences panel. If any of the graphs go above this threshold level, the graph is
highlighted in red, indicating that the threshold has been exceeded.
** _Draw dive computer reported ceiling red_: This checkbox allows exactly what it says.
Not all dive computers report ceiling values. If the dive computer does report it, it may differ
from the ceilings calculated by _Subsurface_. This is because of the different algorithms and gradient factors available for calculating ceilings, as well as the dynamic way that a
dive computer can calculate ceilings during a dive.
** _Show unused cylinders in Equipment Tab_: This checkbox allows display of information about unused cylinders when viewing the *Equipment Tab*. Conversely, if this box is not checked, and any cylinders entered using the *Equipment Tab* are not used (e.g. there was no gas switch to such a cylinder), then these cylinders are omitted from that list.
** _Show average depth_: Activating this checkbox causes _Subsurface_ to draw a grey line across
the dive profile, indicating the mean depth of the dive up to a particular point in time during
that dive. Normally this is a u-shaped line indicating the deepest average depth just before the
ascent.
* *Misc*:
** Gradient Factors:* Here users can set the _gradient factors_ used while diving. GF_Low is
the gradient factor at depth and GF_High is used just below the surface.
At intermediate depths gradient factors between GF_Low and GF_High are used.
Gradient factors add conservatism to the nitrogen exposure during a dive, in a
similar way that many dive computers have a conservatism setting. The lower
the value of a gradient factor, the more conservative the calculations are with
respect to nitrogen loading and the deeper the ascent ceilings are. Gradient
factors of 20/60 are considered conservative and values of 60/90 are considered
harsh. Checking *GFLow at max depth* box causes GF_Low to be used at the
deepest depth of a dive. If this box is not checked, GF_Low is applied at
all depths deeper than the first deco stop. For more information see:
*** http://www.tek-dive.com/portal/upload/M-Values.pdf[Understanding M-values by Erik Baker, _Immersed_ Vol. 3, No. 3.]
*** link:http://www.rebreatherworld.com/general-and-new-to-rebreather-articles/5037-gradient-factors-for-dummies.html[Gradient factors for dummies, by Kevin Watts]
** _CCR: Show setpoints when viewing pO2:_ With this checkbox ativated, the pO~2~
graph on the dive profile has an overlay in red which inticates the CCR setpoint
values. See the section on xref:S_CCR_dives[Closed Circuit Rebreather dives].
** _CCR: Show individual O~2~ sensor values when viewing pO~2~:_ Show the pO~2~
values associated with each of the individual oxygen sensors of a CCR system.
See the section on xref:S_CCR_dives[Closed Circuit Rebreather dives].
* *Configuring dive planning using rebreather equipment:*
** _Default CCR setpoint for dive planning:_ Specify the O~2~ setpoint for a
CCR dive plan. This determines the pO~2~ that will be maintained
during a particular dive. This is the setpoint that is used at the start
of any CCR dive. Setpoint changes during the dive can be added via the
profile context menu.
** _pSCR O~2~ metabolism rate:_ For a semiclosed rebreather (pSCR) system, this is the
volume of oxygen used by a diver each minute. Set this value for pSCR dive planning
and decompression calculations.
** _pSCR ratio:_ For pSCR equipment the dump ratio is the ratio of gas released to the
environment to that of the gas recirculated to the diver. Set this value for a
pSCR dive plan.
=== Language
Choose a language that _Subsurface_ will use.
image::images/Pref4_f20.jpg["FIGURE: Preferences Language page", align="center"]
A checkbox allows one to use the _System Default_ language which in most
cases will be the correct setting; with this _Subsurface_ simply runs in the
same language / country settings as the underlying OS. If this is for some
reason undesirable users can uncheck this checkbox and pick a language /
country combination from the list of included localizations. The _Filter_
text box allows one to list similar languages. For instance there are
several system variants of English or French. This particular preference
requires a restart of _Subsurface_ to take effect.
=== Network
This panel facilitates communication between _Subsurface_ and data sources
on the Internet.
image::images/Pref5_f20.jpg["FIGURE: Preferences Network page", align="center"]
This is important, for instance, when _Subsurface_ needs to communicate with
Internet services such as the <<S_Companion,_Subsurface Companion app_>> or
data export/import from _Divelogs.de_. These Internet requirements are
determined by one's type of connection to the Internet and by the Internet
Service Provider (ISP) used. One's ISP should provide the appropriate
information. If a proxy server is used for Internet access, the appropriate
information needs to be provided here. The type of proxy needs to be
selected from the dropdown list. after which the IP address of the host and
the appropriate port number should be provided. If the proxy server uses
authentication, the appropriate userID and password also needs to be
provided so that _Subsurface_ can automatically pass through the proxy
server to access the Internet.
=== Facebook Accesss
This panel allows one to log into a Facebook account in order to transfer
information from Subsurface to Facefook.
image::images/Pref6_f20.jpg["FIGURE: Facebook login panel", align="center"]
If one provides a valid Facebook userID and password, a connection to
Facebook is created. The connection to Facebook is closed when one closes
down Subsurface. At this point the checkbox labelled "Keep connection to
Subsurface", on the login screen has no effect. See the section
xref:S_facebook[Exporting dive profiles to Facebook] for more information.
[[S_DivePlanner]]
== The _Subsurface_ dive planner
Dive planning is an advanced feature of _Subsurface_, accessible by
selecting _Log -> Plan Dive_ from the main menu. It allows calculation of
nitrogen load during a dive by using the Bühlmann ZH-L16 algorithm with the
addition of gradient factors as implemented by Erik Baker.
****
[icon="images/icons/warning2.png"]
[WARNING]
The _Subsurface_ dive planner IS CURRENTLY EXPERIMENTAL and assumes the user
is already familiar with the _Subsurface_ user interface. It is explicitly
used under the following conditions:
- The user is conversant with dive planning and has the necessary training to
perform dive planning.
- The user plans dives within his/her certification limits.
- Dive planning makes large assumptions about the characteristics of the
_average person_ and cannot compensate for individual physiology or health
or personal history or life style characteristics.
- The safety of a dive plan depends heavily on the way in which the planner is
used.
- The user is familiar with the user interface of _Subsurface_.
- A user who is not absolutely sure about any of the above requirements should
not use this feature.
****
=== The _Subsurface_ dive planner screen
Like the _Subsurface_ dive log, the planner screen is divided into several
sections (see image below). The *setup* parameters for a dive are entered
into the several sections on the left hand side of the screen. The setup is
divided into several sections: Available Gases, Rates, Planning, Gas Options
and Notes.
At the top right hand is a green *design panel* upon which the profile of
the dive can be manipulated directly by dragging and clicking as explained
below. This feature makes the _Subsurface_ dive planner unique in ease of
use.
At the bottom right is a text panel with a heading of _Dive Plan
Details_. This is where the details of the dive plan are provided in a way
that can easily be copied to other software. This is also where any warning
messages about the dive plan are printed.
image::images/PlannerWindow1_f20.jpg["FIGURE: Dive planner startup window", align="center"]
=== Open circuit dives as an example of dive planning
- Towards the left bottom of the planner (circled in blue in the image below)
is a dropbox with three options. Select the appropriate one of these:
** Open Circuit (the default)
** CCR
** pSCR
- In the top left-hand area of the planning screen, ensure that the constant
dive parameters are appropriate. These are: Start date and time of the dive,
Atmospheric Pressure and Altitude above sea level of the dive site. The
atmospheric pressure can also be entered as an altitude in metres, assuming
an atmospheric pressure of 1.013 bar.
- In the table labelled _Available Gases_, add the information of the
cylinders to be used as well as the gas composition within that
cylinder. This is done in a similar way as for <<S_CylinderData,providing
cylinder data for dive logs>>. Choose the cylinder type by double clicking
the cylinder type and using the dropdown list, then specify the work
pressure of this cylinder. By leaving the oxygen concentration (O2%) filed
empty, the cylinder is assumed to contain air. Otherwise enter the oxygen
and/or helium concentration in the boxes provided in this dialogue. Add
additional cylinders by using the "+" icon to the top righthand of the
dialogue.
- The dialogue indicating _Dive Planner Points_ is usually not used at this
stage of the dive planning.
*The planning is performed in three stages*
*a) Nitrogen management*: This is performed by specifying the rates for descent and ascent,
as well as the gradient factors (GFLow and GFHigh) under the headings _Rates_ and _Planning_
to the bottom left of the planning screen. Initially, the GFHigh and GFLow values in the _Preferences_
panel of _Subsurface_ is used. If these are changed within the planner (see _Gas Options_ within
the planner), the new values are
used without changing the original values in the _Preferences_. Gradient Factor settings strongly affect the calculated ceilings and their depths.
A very low GFLow value brings about decompression stops early on during the dive.
** For more information about Gradient factors, see the section on xref:S_GradientFactors[Gradient Factor Preference settings].
For more information external to this manual see:
* link:http://www.tek-dive.com/portal/upload/M-Values.pdf[Understanding
M-values by Erik Baker, _Immersed_ Vol. 3, No. 3.]
* link:http://www.rebreatherworld.com/general-and-new-to-rebreather-articles/5037-gradient-factors-for-dummies.html[Gradient
factors for dummies, by Kevin Watts]
link:http://www.amazon.com/Deco-Divers-Decompression-Theory-Physiology/dp/1905492073/ref=sr_1_1?s=books&ie=UTF8&qid=1403932320&sr=1-1&keywords=deco+for+divers[_Deco
for Divers_, by Mark Powell (2008). Aquapress] Southend-on-Sea, UK. ISBN 10:
1-905492-07-3. An excellent non-technical review.
The ascent rate is critical for nitrogen off-gassing at the end of the dive
and is specified for several depth ranges, utilising the average (or mean)
depth as a yardstick. The mean depth of the dive plan is indicated by a
light grey line on the dive profile. Ascent rates at deeper levels are often
in the range of 8-12 m/min, while ascent rates near the surface are often in
the range of 4-9 m/min. The descent rate is also specified. If the option
_Drop to first depth_ is activated, then the descent phase of the planned
dive will be at the maximal descent rate specified in the _Rates_ section of
the dive setup.
*b) Oxygen management*: In the *Gas Options* part of the dive specification, the maximum partial
pressure for oxygen needs to be specified for the
bottom part of the dive (_bottom po2_) as well as for the decompression part of the dive (_deco po2_).
The most commonly
used values are 1.4 bar for the bottom part of the dive and 1.6 bar for any decompression
stages. Normally, a partial pressure of 1.6 bar is not exceeded. PO2 settings and the depth at which switching to a gas takes place can also be edited in the
_Available Gases_ dialog. Normally the planner decides on switching to a new gas when, during
ascent, the partial pressure of the new gas has increased to 1.6 bar.
*c) Gas management*: With open-circuit dives this is a primary consideration. One needs to keep within the limits of the amount of gas within the dive
cylinder(s), allowing for an appropriate margin for a safe return to the surface, possibly
sharing with a buddy. Under the _Gas Options_ heading, specify the best (but conservative) estimate
of your surface-equivalent air consumption (SAC, also termed RMV) in
litres/min (for the time being, only SI units are supported). Specify the SAC during the
bottom part of the dive (_bottom SAC_) as well as during the decompression or safety stops of the
dive (_deco SAC_). Values of 15-30 l/min are common. For good gas management, a thumbsuck guess
is not sufficient and one needs to
monitor one's gas consumption on a regular basis, dependent on different dive conditions and/or equipment.
The planner calculates the total volume of gas used during the dive and issues a warning
if one exceeds the total amount of gas available. Good practice demands that one does not dive to
the limit of the gas supply but that an appropriate reserve is kept for unforeseen circumstances.
For technical diving, this reserve can be up to 66% of the total available gas.
Now (at last) one can start the detailed time-depth planning of the
dive. _Subsurface_ offers a unique graphical interface for performing this
part of the planning. The mechanics of doing this is similar to
hand-entering a dive profile in the dive log part of _Subsurface_. Upon
activating the planner, a default dive of depth 15 m for 40 min is offered
in the bue design surface to the top right hand of the screen. The white
dots (waypoints) on the profile can be dragged with a mouse. Create more
waypoints by double-clicking on the profile line and ensuring that the
profile reflects the intended dive. Drag the waypoints to represent the
depth and duration of the dive. It is NOt necessary to specify the ascent
part of the dive since the planner calculates this, based on the settings
that have been specified. If any of the management limits (for nitrogen,
oxygen or gas) is exceeded, the surface above the dive profile changes from
BLUE to RED.
Each waypoint on the dive profile creates a _Dive Planner Point_ in the
table on the left of the dive planner panel. Ensure that the _Used Gas_
value in each row of that table corresponds to one of the gas mixtures
specified in the _Available Gases_ table. Add new waypoints until the main
features of the dive have been completed, e.g. the bottom time segment and
deep stops (if these are implemented). Leave the remaining waypoints on the
ascent to _Subsurface_. In most cases _Subsurface_ computes additional way
points in order to fulfil decompression requirements for that dive. A
waypoint can be moved by selecting that waypoint and by using the arrow
keys. The waypoints listed in the _Dive Planner Points_ dialogue can be
edited by hand in order to obtain a precise presentation of the dive
plan. In fact, one can create the whole dive profile by editing the _Dive
Planner Points_ dialog.
Indicate any changes in gas cylinder used by indicating gas changes as
explained in the section <<S_CreateProfile,hand-creating a dive
profile>>. These changes should reflect the cylinders and gas compositions
defined in the table with _Available Gases_. If two or more gases are used,
automatic gas switches will be suggested during the ascent to the
surface. However, these changes can be deleted by right-clicking the gas
change and by manually creating a gas change by right-clicking on the
appropriate waypoint.
A non-zero value in the "CC set point" column of the table of dive planner
points indicates a valid setpoint for oxygen partial pressure and that the
segment is dived using a closed circuit rebreather (CCR). If the last
manually entered segment is a CCR segment, the decompression phase is
computed assuming the diver uses a CCR with the specified set-point. If the
last segment (however short) is on open circuit (OC, indicated by a zero
set-point) the decompression is computed in OC mode. The planner only
considers gas changes in OC mode.
Below is an example of a dive plan to 45m using EAN26, followed by an ascent
using EAN50 and using the settings as described above.
image::images/DivePlanner2_f20.jpg["FIGURE: Planning a dive: setup", align="center"]
Once the above has been completed, one can save it by clicking the _Save_
button towards the top middle of the planner. The saved dive plan will
appear in the *Dive List* panel of _Subsurface_.
*The dive plan details*
On the bottom right of the dive planner, under _Dive Plan Details_, the
exact details of the dive plan are provided. These details may be modified
by checking any of the options under the _Notes_ section of the dive
planner, immediately to the left of the _Dive Plan Details_. If a _Verbatim
diveplan_ is requested, a detailed sentence-level explanation of the dive
plan is given. If any of the management specifications have been exceeded
during the planning, a warning message is printed underneath the dive plan
information.
If the option _Display segment duration_ is checked, then the duration of
each depth level is indicated in the _Dive Plan Details_. This duration
INCLUDES the transition time to get to that level. However, if the _Display
transition in deco_ option is checked, the transitions are shown separately
from the segment durations at a particular level.
=== Planning CCR dives
To plan a dive using a closed circuit rebreather, select the _CCR_ option in
the dropdown list, circled in blue in the image below.
*Available gases*: In the _Available gases_ table, enter the cylinder information for the
diluent cylinder and for any bail-out cylinders. Do NOT enter the information for the oxygen
cylinder since it is implied when the _CCR_ dropdown selection is made.
*Entering setpoints*: Specify a default setpoint in the Preferences tab, by selecting _File -> Preferences -> Graph_ from the main menu. All user-entered segments in the _Dive planner points_ table
use the default setpoint value. Then, different setpoints can be specified for dive segments
in the _Dive planner points_ table. A zero setpoint
means the diver bails out to open circuit mode for that segment. The decompression is always calculated
using the setpoint of the last manually entered segment. So, to plan a bail out ascent for a
CCR dive, add a one-minute dive segment to the end with a setpoint value of 0. The decompression
algorithm does not switch deco-gases automatically while in CCR mode (i.e. when a positive setpoint is specified) but, of course, this is calculated for bail out ascents.
The dive profile for a CCR dive may look something like the image below.
image::images/Planner_CCR1_f20.jpg["FIGURE: Planning a CCR dive: setup", align="center"]
Note that, in the _Dive plan details_, the gas consumption for a CCR segment
is not calculated, so gas consumptions of 0 litres are the norm.
=== Planning pSCR dives
To plan a dive using a passive semi-closed rebreather (pSCR), select _pSCR_ rather than
_Open circuit_ in the dropdown list.
The parameters of the pSCR diver can be set by selecting _File -> Preferences -> Graph_
from the main menu, where the gas consumption calculation takes into account the pSCR dump
ratio (default 10:1) as well as the metabolism rate. The calculation also takes the oxygen drop
accross the mouthpiece of the rebreather into account. If the
pO~2~ drops below what is considered a save value, a warning apears in the _Dive plan
details_. A typical pSCR configuration is with a single cylinder and one or more bail-out
cylinders. Therefore the setup of the _Available gases_ and the _Dive planner points_ tables
are very similar to that of a CCR dive plan, described above. However, no oxygen setpoints
are specified for pSCR dives. Below is a dive plan for a pSCR dive. The dive is comparable
to that of the CCR dive above, but note the longer ascent duration due to the lower oxygen
in the loop due to the oxygen drop accross the mouthpiece of the pSCR equipment.
image::images/Planner_pSCR1_f20.jpg["FIGURE: Planning a pSCR dive: setup", align="center"]
[[S_Replan]]
=== Modifying an existing dive plan
Normally, when a dive plan has been saved, it is accessible from the *Dive
List*, like any other dive log. Within the *Dive List* there is not a way to
change a saved dive plan. To perform changes to a dive plan, select it on
the *Dive List*. Then, in the main menu, select _Log -> Re-plan dive_. This
will open the selected dive plan within the dive planner, allowing changes
to be made and saved as usual.
In addition there is the option "Save new". This keeps the original planned
dive and adds a (possibly modified) copy to the dive list. If that copy is
saved with the same start time as the original, the two dives are considered
two versions of the same dive and do not influence other each during
decompression calculation (see next section).
=== Planning for repetitive dives
Repetitive dives can easily be planned if the dates and start times of the
repetitive dive set is specified appropriately in the top left-hand _Start
Time_ field. _Subsurface_ calculates the gas loading figures correctly and
the effect of the first dive is evaluated on later dives.
If one has just completed a long/deep dive and is planning another dive,
then highlight, in the *Dive List*, the dive that has just been completed
and then activate the planner. Depending on the start time of the planned
dive, the planner takes into account the gas loading incurred during the
completed dive and allows planning within these limitations.
If only a few standard configurations are used (e.g. in GUE), then a
template dive can be created conforming to one of the configurations. If one
now wishes to plan a dive using this configuration, just highlight the
template dive in the *Dive List* and activate the planner: the planner takes
into account the configuration in the highlighted dive.
=== Printing the dive plan
Selecting the _Print_ button in the planner allows printing of the _Dive
Plan Details_ for wet notes. Alternatively one can cut and paste the _Dive
Plan Details_ for inclusion in a text file or word processing document.
Dive plans have many characteristics in common with dive logs (dive profile,
dive notes, etc). After a dive plan has been saved, the dive details and
gas calculations are saved in the *Notes* tab. While a dive plan is
being designed, it can be printed using the _Print_ button in the dive
planner. This prints the dive details and gas calculations in the _Dive Plan
Details_ panel of the dive planner. However, after the plan has been saved,
it is represented in a way very similar to a dive log and the gas
calculations cannot be accessed in the same way as during the planning
process. The only way to print the dive plan is to use the _File -> Print_
facility on the main menu in the same way as for dive logs or by copy and
paste to a word processor.
== Description des éléments du menu principal de Subsurface
Cette section décrit les fonctions et les opérations des éléments du menu
principal de Subsurface. Plusieurs éléments ci-dessous sont des liens vers
des sections de ce manuel traitant des opérations relatives.
=== Fichier
- <<S_NewLogbook,_Nouveau carnet de plongée_>> - Fermer le carnet de plongée
actuellement ouvert et supprime toutes les informations de plongées.
- _Ouvrir un carnet de plongée_ - Cela ouvre une fenêtre pour sélectionner le
carnet de plongée à ouvrir.
- _Sauvegarder_ - Enregistrer le carnet de plongée qui est actuellement
ouvert.
- _Enregsitrer sous_ - Enregistrer le carnet actuel sous un nom différent.
- _Fermer_ - Fermer le carnet de plongée actuellement ouvert.
- <<S_ExportLog,_Exporter_>> - Exporter le carnet de plongée actuellement
ouvert (ou les plongées sélectionnées dans le carnet) vers un des nombreux
formats.
- <<S_PrintDivelog,_Imprimer_>> - Imprimer le carnet de plongée actuellement
ouvert.
- <<S_Preferences,_Préférences_>> - Définir les préférences de _Subsurface_.
- <<S_Configure,_Configurer l'ordinateur de plongée_>> - Modifier la
configuration d'un ordinateur de plongée.
- _Quitter_ - Quitter _Subsurface_.
=== Importer
- <<S_ImportDiveComputer,_Importer depuis un l'ordinateur de plongée_>> -
Importer des informations de plongées à partir de l'ordinateur de plongée.
- <<Unified_import,_Importer des fichiers de log_>> - Importer des
informations de plongées à partir d'un fichier d'un format compatible avec
_Subsurface_.
- <<S_Companion,_Importer les données GPS depis le service web Subsurface_>> -
Charge les coordonnées GPS à partir de l'application mobile _Subsurface_
(téléphones et tablettes).
- <<S_ImportingDivelogsDe,_Importer depuis Divelogs.de_>> - Importer des
informations de plongées à partir de _www.Divelogs.de_.
=== Journal (log)
- <<S_EnterData,_Ajouter une plongée_>> - Ajouter manuellement une nouvelle
plongée au panneau de la *liste des plongées*.
- <<S_DivePlanner,_Planifier une plongée_>> - Cette fonctionnalité permet de
planifier des plongées.
- <<S_Replan,_Replanifier une plongée_>> - Modifier une plongée planifiée qui
a été enregistrée dans la *liste des plongées*.
- <<S_CopyComponents,_Copier les composants de la plongée_>> - En
sélectionnant cette option, vous pouvez copier les informations de plusieurs
champs d'un journal de plongée vers le presse-papier.
- _Coller les composants de la plongée_ - Colle, dans les plongées
sélectionnées dans la *liste des plongées*, les informations copiées au
préalable avec l'option _Copier les composants de la plongée_.
- <<S_Renumber,_Renuméroter_>> - Renuméroter les plongées sélectionnées dans
le panneau de la *liste des plongées*.
- <<S_Group,_Grouper automatiquement_>> - Grouper les plongées du panneau de
*liste des plongées* dans des voyages de plongées.
- <<S_DeviceNames,_Editer les noms des ordinateurs de plongée_>> - Modifier
les noms des ordinateurs de plongée pour faciliter vos journaux (logs).
- <<S_Filter,_Filtrer la liste des plongées_>> - Sélectionner seulement
certaines plongées, à partir de tags ou de critères de plongées.
=== Vue
- <<S_ViewPanels,_Tout_>> - Affiche les quatre panneaux principaux de
_Subsurface_ simultanément.
- <<S_ViewPanels,_Liste des plongées_>> - Affiche uniquement le panneau de la
*liste des plongées*.
- <<S_ViewPanels,_Profil_>> - Affiche uniquement le panneau du *profil de la
plongée*.
- <<S_ViewPanels,_Info_>> - Affiche uniquement le panneau des *notes de
plongée*.
- <<S_ViewPanels,_Globe_>> - Affiche uniquement le panneau de la *carte
mondiale*.
- _Statistiques annuelles_ - Affiche par année le résumé des statistiques des
plongées effectuées.
- _Ordinateur précédent_ - Passer à l'ordinateur de plongée précédent.
- _Ordinateur suivant_ - Passer à l'ordinateur de plongée suivant.
- _Plein écran_ - Passer en mode plein écran.
=== Aide
- _À propos de Subsurface_ - Affiche un panneau avec le numéro de version de
_Subsurface_ ainsi que les informations de licence.
- _Vérifier les mises à jour_ - Vérifier si une nouvelle version de
Subsurface est disponible sur le http://subsurface-divelog.org/[site web de
_Subsurface_ ].
- <<S_UserSurvey,_Sondge utilisateur_>> - Aidez à rendre _Subsurface_ encore
meilleur en répondant à notre sondage utilisateur.
- _Manuel utilisateur_ - Ouvre une fenêtre affichant ce manuel utilisateur.
== ANNEXE A : informations spécifiques au système d'exploitation utilisé pour importer les informations de plongées depuis un ordinateur de plongée.
=== Assurez-vous que les pilotes (drivers) nécessaires sont installés
[icon="images/icons/drivers.jpg"]
[NOTE]
Le système d'exploitation de l'ordinateur nécessite les bons pilotes pour
communiquer avec l'ordinateur de plongée de la façon utilisée par
l'ordinateur de plongée (Bluetooth, USB, infra-rouge).
* Sous Linux, les utilisateurs doivent avoir le bon module noyau de chargé. La
plupart des distributions Linux le font automatiquement, de telle sorte que
l'utilisateur n'ait rien à faire de particulier. Cependant, certains
protocoles de communication nécessitent des pilotes additionnels, plus
particulièrement pour certaines technologies telles que l'infra-rouge.
* Sous Windows, le bon pilote devrait être téléchargé automatiquement la
première fois que l'utilisateur branche son ordinateur de plongée sur le
port USB de son ordinateur de bureau.
Sous Mac, les utilisateurs peuvent parfois avoir besoin d'installer
manuellement le bon pilote. Par exemple, pour le Mares Puck ou n'importe
quel autre ordinateur de plongée utilisant une interface USB-série basé sur
le composant Silicon Labs CP2101 ou similaire, le bon pilote est disponible
sous _Mac_OSX_VCP_Driver.zip_ sur le
http://www.silabs.com/support/pages/document-library.aspx?p=Interface&f=USB%20Bridges&pn=CP2101[dépôt
de documents et logiciels Silicon Labs].
[[S_HowFindDeviceName]]
=== Comment trouver le nom du périphérique branché sur USB et paramétrer les permissions en écriture
[icon="images/icons/usb.jpg"]
[NOTE]
Lorsqu'un utilisateur connecte un ordinateur de plongée en utilisant l'USB,
généralement _Subsurface_ proposera soit une liste déroulante contenant le
bon nom (ou le point de montage pour un Uemis Zurich) ou la liste sera
désactivée si aucun nom de périphérique n'est nécessaire. Dans les rares cas
où cela ne fonctionnerait pas, voici quelques suggestions pour trouver le
nom de votre périphérique ;
.Sur Windows :
Essayez simplement COM1, COM2, etc. La liste déroulante devrait contenir
tous les périphériques COM connectés.
.Sur MacOS :
La liste déroulante devrait contenir tous les ordinateurs de plongée
connectés.
.Sur Linux :
Il existe un moyen sûr de trouver le port :
- Déconnecter le cable USB de l'ordinateur de plongée
- Ouvrir un terminal
- Taper la commande 'dmesg' et appuyer sur la touche Entrer
- Connecter le cable USB de l'ordinateur de plongée
- Taper la commande 'dmesg' et appuyer sur la touche Entrer
Un message similaire à celui-ci devrait apparaitre :
usb 2-1.1: new full speed USB device number 14 using ehci_hcd
usbcore: registered new interface driver usbserial
USB Serial support registered for generic
usbcore: registered new interface driver usbserial_generic
usbserial: USB Serial Driver core
USB Serial support registered for FTDI USB Serial Device
ftdi_sio 2-1.1:1.0: FTDI USB Serial Device converter detected
usb 2-1.1: Detected FT232BM
usb 2-1.1: Number of endpoints 2
usb 2-1.1: Endpoint 1 MaxPacketSize 64
usb 2-1.1: Endpoint 2 MaxPacketSize 64
usb 2-1.1: Setting MaxPacketSize 64
usb 2-1.1: FTDI USB Serial Device converter now attached to ttyUSB3
usbcore: registered new interface driver ftdi_sio
ftdi_sio: v1.6.0:USB FTDI Serial Converters Driver
La troisième ligne en partant du bas montre que l'adaptateur FTDI USB est
détecté et connecté sur +ttyUSB3+. Cette information peut à présent être
utilisée pour les paramètres d'importation en tant que +/dev/ttyUSB3+ pour
que Subsurface utilise le bon port USB.
S'assurer que l'utilisateur possède les droits d'écriture sur le port série
USB :
Sur les systèmes similaires à Unix, les ports USB ne peuvent être accédés
que par des utilisateurs membres du groupe +dialout+. Si vous n'êtes pas
root, vous n'êtes peut-être pas membre de ce groupe et ne pouvez donc pas
utiliser le port USB. Si votre nom d'utilisateur est 'johnB' :
En tant que root, tapez : usermod -a -G dialout johnB+ (utilisateurs
d'Ubuntu : +sudo usermod -a -G dialout johnB+) Cela ajoute johnB au groupe
+dialout+.
Tapez : +id johnB+ Cela liste tous les groupes auquel johnB appartient et
vérifiez que
l'appartenance au groupe est bien effectif. Le groupe +dialout+ devrait
être listé
parmi les différents IDs.
Sous certaines circonstances, les modifications ne prennent effet qu'après une déconnexionpuis reconnexion sur l'ordinateur (sous Ubuntu, par exemple).
Avec le bon nom de périphérique (par exemple +dev/ttyUSB3+) et avec un accès
en écriture au port USB, l'ordinateur de plongée devrait se connecter et
vous devriez pouvoir importer vos plongées.
[[S_HowFindBluetoothDeviceName]]
=== Setting up bluetooth enabled devices
[icon="images/icons/bluetooth.jpg"]
[NOTE]
For dive computers communicating through bluetooth like the Heinrichs
Weikamp Frog or the Shearwater Predator and Petrel there is a different
procedure to get the devices name to communicate with _Subsurface_. Follow
these steps:
* *For the dive computer, after enabling Bluetooth, ensure it is in Upload mode.*
For Bluetooth pairing of the dive computer, refer to the manufacturer's user
guide. When using a Shearwater Predator/Petrel, select _Dive Log -> Upload
Log_ and wait for the _Wait PC_ message.
* *Pair the _Subsurface_ computer with the dive computer.*
.Sur Windows :
Bluetooth is most likely already enabled. For pairing with the dive computer
choose _Control Panel -> Bluetooth Devices -> Add Wireless Device_. This
should bring up a dialog showing your dive computer (in Bluetooth mode) and
allowing pairing. Right click on it and choose _Propertie s-> COM Ports_ to
identify the port used for your dive computer. If there are several ports
listed, use the one saying "Outgoing" instead of "Incoming".
For downloading to _Subsurface_, the _Subsurface_ drop-down list should
contain this COM port already. If not, enter it manually.
Note: If there are issues afterwards when downloading from the dive computer
using other software, remove the existing pairing with the dive computer.
.Sur MacOS :
Click on the Bluetooth symbol in the menu bar and select _Set up Bluetooth
Device..._. The dive computer should then show up in the list of
devices. Select it and go through the pairing process. This step should only
be needed once for initial setup.
Once the pairing is completed the correct device is shown in the 'Device or
Mount Point' drop-down in the _Subsurface_ *Import* dialog.
.Sur Linux
Ensure Bluetooth is enabled on the _Subsurface_ computer. On most common
distributions this should be true out of the box and pairing should be
straight forward. For instance, Gnome3 shows a Bluetooth icon in the upper
right corner of the desktop where one selects 'Set up New Device'. This
should show a dialog where one can select the dive computer (which already
should be in Bluetooth mode) and pair it. If a PIN is required, try
manually setting '0000'.
In the rare cases where the above is not true, then depending on your
system, try +initd+ or +systemd+. This might be different and also involve
loading modules specific to your hardware. In case your system is running
+systemd+, manually run +systemctl start bluetooth.service+ to enable it, in
case of +initd+, run something like +rc.config start bluetoothd+ or
+/etc/init.d/bluetooth start+.
One may also use a manual approach by using such commands:
* +hciconfig+ shows the Bluetooth devices available on your computer (not dive
computer), most likely one will see a hci0, if not try +hcitool -a+ to see
inactive devices and run +sudo hciconfig hci0 up+ to bring them up.
* +hcitool scanning+ gets a list of bluetooth enabled client devices, look for
the dive computer and remember the MAC address are shown there
* +bluez-simple-agent hci0 10:00:E8:C4:BE:C4+ pairs the dive computer with the
bluetooth stack of the _Subsurface_ computer, copy/paste the MAC address
from the output of 'hcitool scanning'
Unfortunately on Linux binding to a communication device has to be done
manually by running:
* +rfcomm bind /dev/rfcomm0 10:00:E8:C4:BE:C4+ binds the dive computer to a
communication device in the desktop computer, in case rfcomm is already
taken use rfcomm1 or up. IMPORTANT: Copy/paste the MAC address from the
output of +hcitool scanning+, the MAC address shown above will not work.
For downloading dives in _Subsurface_ specify the device name connected to
the MAC address in the last step above, e.g. _/dev/rfcomm0_.
[[_appendix_b_dive_computer_specific_information_for_importing_dive_information]]
== APPENDIX B: Dive Computer specific information for importing dive data.
[[S_ImportUemis]]
=== Importing from Uemis Zurich
[icon="images/icons/iumis.jpg"]
[NOTE]
_Subsurface_ downloads the information stored on the SDA (the built-in file
system of the Uemis) including information about dive spots and
equipment. Buddy information is not yet downloadable. Things are very
similar to a normal USB-connected dive computer (the Uemis is one of those
that recharge when connected to the USB port). The main difference is that
one does not enter a device name, but instead the location where the
UEMISSDA file system is mounted once connected to the dive computer. On
Windows this is a drive letter ( often 'E:' or 'F:'), on a Mac this is
'/Volumes/UEMISSDA' and on Linux systems this differs depending on the
distribution. On Fedora it usually is
'/var/run/media/<your_username>/UEMISSDA'. In all cases _Subsurface_ should
suggest the correct location in the drop down list.
After selecting the above device name, download the dives from the Uemis
Zurich. One technical issue with the Uemis Zurich download implementation
(this is a Uemis firmware limitation, not a _Subsurface_ issue) is that one
cannot download more than about 40-50 dives without running out of memory on
the SDA. This will usually only happen the very first time one downloads
dives from the Uemis Zurich. Normally when downloading at the end of a day
or even after a dive trip, the capacity is sufficient. If _Subsurface_
displays an error that the dive computer ran out of space the solution is
straight forward. Disconnect the SDA, turn it off and on again, and
reconnect it. You can now retry (or start a new download session) and the
download will continue where it stopped previously. One may have to do this
more than once, depending on how many dives are stored on the dive computer.
[[S_ImportingGalileo]]
=== Importing from Uwatec Galileo
[icon="images/icons/Galileo.jpg"]
[NOTE]
The Uwatec Galileo dive computers use infra red (IrDA) communication between
the dive computer and Subsurface. The Uwatec hardware uses a USB dongle
based on the serial infra-red (SIR) protocol and the MSC7780 IrDA controller
manufactured by MosChip and marketed by Scubapro and some electronics
companies. Under Linux, the kernel already provides for communication using
the IrDA protocol. However, the user additionally needs to load a driver for
the IrDA interface with the dive computer. The easiest way is to load the
*irda-tools* package from the
http://irda.sourceforge.net/docs/startirda.html[Linux IrDA Project]. After
the installation of the irda-tools, the *root user* can specify a device
name from the console as follows: +irattach irda0+
After executing this command, Subsurface will recognise the Galileo dive
computer and download dive information.
Under Windows, a similar situation exists. Drivers for the MCS7780 are
available from some Internet web sites e.g.
http://www.drivers-download.com/Drv/MosChip/MCS7780/[www.drivers-download.com].
For the Apple Mac, IrDA communication via the MCS7780 link is not available
for OSX 10.6 or higher.
[[S_ImportingDR5]]
=== Importing from Heinrichs Weikamp DR5
[icon="images/icons/HW_DR5.jpg"]
[NOTE]
When mounted as a USB drive the Heinrichs Weikamp DR5 saves a single UDDF
file for every dive. Mark all the dives you'd like to import or open.
Note: The DR5 does not seem to store gradient factors nor deco information,
so for _Subsurface_ it is not possible to display them. Adjust the gradient
factors in the _Graph Settings_ in _Subsurface_ to generate a deco overlay
in the _Subsurface_ *Dive Profile* panel but please note that the deco
calculated by _Subsurface_ will most likely differ from the one displayed on
the DR5.
[[S_ImportingXDeep]]
=== Importing from xDEEP BLACK
[icon="images/icons/HW_xdeepblack.jpg"]
[NOTE]
Each dive has to be individually saved as UDDF file using "Export UDDF"
option in BLACK's logbook menu. When mounted as a USB drive UDDF files are
available in LOGBOOK directory. Note: The xDEEP BLACK saves NDL time but
does not seem to store gradient factors nor deco information, so for
_Subsurface_ it is not possible to display them. Adjust the gradient factors
in the _Graph Settings_ in _Subsurface_ to generate a deco overlay in the
_Subsurface_ *Dive Profile* panel but please note that the deco calculated
by _Subsurface_ will most likely differ from the one displayed on the xDEEP
BLACK.
=== Importing from Shearwater Predator using Bluetooth
[icon="images/icons/predator.jpg"]
[NOTE]
Using a Shearwater Predator one may be able to pair Bluetooth but then
encounter issues when downloading, showing errors like _Slip RX: unexp. SLIP
END_ on the Predator. This might also arise when using other dive log
software and operating systems other than Linux. We have no detailed idea
about the source and how to fix this, but it is reported to be solved
sometimes by one of these steps:
* use the Bluetooth dongle which came with the Shearwater Predator instead of
the built-in one of the _Subsurface_ computer
* switch to different Bluetooth drivers for the same hardware
* switch off WiFi while using Bluetooth
[[S_PoseidonMkVI]]
=== Importing from Poseidon MkVI Discovery
[icon="images/MkVI.jpeg"]
[NOTE]
Download of dive logs from the MkVI is performed using a custom
communications adapter and the _Poseidon PC Configuration Software_,
obtained when purchasing the MKVI equipment. The latter is a Windows
application allowing configuration of equipment and storage of dive
logs. Communication between dive computer and desktop computer utilises the
IrDA infra-red protocol. Only data for one dive can be downloaded at a time,
comprising three files:
- Setup configuration for the dive and key dive parameters (file with a .txt
extension)
- Dive log details (file with a .csv extension)
- Redbook format dive log (file with .cvsr extension). This is a compressed
version of the dive log using a proprietary format.
_Subsurface_ accesses the .txt and the .csv files to obtain dive log
information.
=== Importing from APD Inspiration CCR
[icon="images/APDComputer.jpg"]
[NOTE]
The dive logs of an APD Inspiration or similar CCR dive computer are
downloaded using a communications adapter and _AP Communicator_, obtained
when purchasing the equipment. The dive logs can be viewed using the _AP Log
Viewer_, within Windows or Mac/OS. However, APD logs can be viewed and
managed from within _Subsurface_ (together with dives using many other types
of dive computer). The APD inspiration dive logs are imported into
_Subsurface_ as follows:
- Open a dive within the _AP Log Viewer_.
- Select the tab at the top of the screen, entitled "_Data_".
- If the raw dive log data show on the screen, click on "_Copy to Clipboard_".
- Open a text editor, e.g. Notepad (Windows), TextWrangler (Mac).
- Copy the contents of the clipboard into the text editor and save the text
file with a filename extension of .CSV
- Within _Subsurface_, select _Import -> Import log files_ to open the
xref:Unified_import[universal import dialogue].
- In the dropdown list towards the bottom right of the dialogue, select "_CSV
files_".
- On the list of file names select the .CSV file that has been created
above. An import dialogue opens.
- In the dropdown list on the middle right labeled '_Pre-configured imports_",
select _APD Log Viewer_.
- Ensure the other settings for the ADP dive log are appropriate, then select
_OK_.
The APD dive log will appear within _Subsurface_.
== APPENDIX C: Exporting Dive log information from external dive log software.
The import of dive log data from external dive log software is mostly
performed using the dialogue found by selecting _Import_ from the Main Menu,
then clicking on _Import Log Files_. This is a single-step process, more
information about which can be found xref:Unified_import[here.] However, in
some cases, a two-step process may be required:
1. Export the foreign dive log data to format that is accessible from
_Subsurface_.
2. Import the accessible dive log data into _Subsurface_.
This appendix provides some information about approaches to export dive log
data from foreign dive log software. The procedures below mostly apply to
Linux and/or Windows.
[[S_ImportingDivesSuunto]]
=== Exporting from *Suunto Divemanager (DM3, DM4 or DM5)*
[icon="images/icons/suuntologo.jpg"]
[NOTE]
DiveManager is a MS Windows application for Suunto dive computers.
Divemanager 3 (DM3) is an older version of the Suunto software. More recent
Suunto dive computers use Divemanager version 4 or 5 (DM4 or DM5). The
different versions of Divemanager use different methods and different file
naming conventions to export dive log data.
*Divemanager 3 (DM3):*
1. Start 'Suunto Divemanager 3' and log in with the name containing the logs
2. Do not start the import wizard to import dives from the dive computer.
3. In the navigation tree on the left side of the program-window, select the
appropriate dives.
4. Within the list of dives, select the dives you would like to import later:
* To select certain dives: hold 'ctrl' and click the dive
* To select all dives: Select the first dive, hold down shift and
select the last dive
5. With the dives marked, use the program menu _File -> Export_
6. The export pop-up will show. Within this pop-up, there is one field called
'Export Path'.
* Click the browse button next to the field Export Path
** A file-manager like window pops up
** Navigate to the directory for storing the
Divelog.SDE file
** Optionally change the name of the file for saving
** Click 'Save'
* Back in the Export pop-up, press the button 'Export'
7. The dives are now exported to the file Divelog.SDE.
*Divemanager 4 (DM4) and Divemanager 5 (DM5):*
DM4 and DM5 use identical mechanisms for exporting dive logs. To export a
divelog from Divemanager one needs to locate the DM4/DM5 database where the
dives are stored. the user can either look for the original database or make
a backup of the dives. Both methods are described here.
Locating the Suunto DM4 (or DM5) database:
1. Start Suunto DM4/DM5
2. Select 'Help -> About'
3. Click 'Copy' after text 'Copy log folder path to clipboard'
4. Now open Windows Explorer
5. Paste the address to the path box at the top of the File Explorer
6. The database is called DM4.db or DM5.db
Making a backup copy of the Suunto DM4/DM5 database:
1. Start Suunto DM4/DM5
2. Select 'File - Create backup'
3. From the file menu select the location and name for the backup, we'll use
DM4 (or DM5) in here with the default extension .bak
4. Click 'Save'
5. The dives are now exported to the file DM4.bak (or DM5.bak)
=== Exporting from Atomic Logbook
[[Atomic_Export]]
[icon="images/icons/atomiclogo.jpg"]
[NOTE]
Atomic Logbook is a Windows software by Atomic Aquatics. It allows
downloading of dive information from Cobalt and Cobalt 2 dive computers.
The divelog is kept in a SQlite database at
C:\ProgramData\AtomicsAquatics\Cobalt-Logbook\Cobalt.db. This file can be
directly imported to Subsurface.
=== Exporting from Mares Dive Organiser V2.1
[[Mares_Export]]
[icon="images/icons/mareslogo.jpg"]
[NOTE]
Mares Dive Organiser is a Windows application. The dive log is kept as a
Microsoft SQL Compact Edition database with a '.sdf' filename extension. The
database includes all Dive Organiser-registered divers on the particular
computer and all Mares dive computers used. The safest way to obtain a copy
of the dive database is to export the information to another compatible
format which can be imported into _Subsurface_.
1. Within Dive Organiser, select _Database -> Backup_ from the main menu and
back up the database to the desk top. This creates a zipped file
DiveOrganiserxxxxx.dbf.
2. Rename the file to DiveOrganiserxxxxx.zip. Inside the zipped directory is a
file _DiveOrganiser.sdf_.
3. Extract the _.sdf_ file from the zipped folder to your Desktop.
4. The password for accessing the .zip file is _mares_.
[[S_ImportingDivingLog]]
=== Exporting from *DivingLog 5.0*
[icon="images/icons/divingloglogo.jpg"]
[NOTE]
Unfortunately DivingLog XML files give us no indication on the preferences
set on one's system. So in order for _Subsurface_ to be able to successfully
import XML files from DivingLog one first needs to ensure that DivingLog is
configured to use the Metric system (one can easily change this within
Diving Log by selecting 'File -> Preferences -> Units and Language' by
clicking the 'Metric' button). Then do the following:
1. In DivingLog open the 'File -> Export -> XML' menu
2. Select the dives to export
3. Click on the export button and select the filename
[[S_Appendix_D]]
== APPENDIX D: Exporting a spreadsheet to CSV format
Many divers keep a diving log in some form of a digital file, commonly a
spreadsheet with various fields of information. These logs can be easily
imported into _Subsurface_ after the spreadsheet is converted in a .CSV
file. This section explains the procedure to convert a diving logbook
stored in a spreadsheet to a .CSV file that will later be imported from
_Subsurface_. Creating a .CSV is a straightforward task, although the
procedure is somewhat different according to which spreadsheet program is
used.
The first step is to organize the diving data in the spreadsheet, so that
the first row contains the names (or titles) of each column and the
information for each dive is stored in a single row. _Subsurface_ supports
many data items (Dive #, Date, Time, Duration, Location, GPS, Max Depth,
Mean Depth, Buddy, Notes, Weight and Tags). The user can organize dive data
following a few simple rules:
1. Date: use one of the following formats: yyyy-mm-dd, dd.mm.yyyy, mm/dd/yyyy
2. Duration: the format should be minutes:seconds.
3. Unit system: only one unit system shold be used (i.e., no mixture between
imperial and metric units)
4. Tags and buddies: values should be separated using a comma.
5. GPS position: users must use decimal degrees, e.g. 30.22496 30.821798
=== _LibreOffice Calc_ and _OpenOffice Calc_
These are open source spreadsheet applications forming parts of larger open
source office suite applications. The user interaction with _LibreOffice_
and _OpenOffice_ is very similar. In Libreoffice Calc the time format
should be set to minutes:seconds - [mm]:ss and dates should be set to one
of: yyyy-mm-dd, dd.mm.yyyy, mm/dd/yyyy. A typical dive log may look like
this:
image::images/LOffice_spreadsheetdata.jpg["FIGURE: Spreadsheet data", align="center"]
To export the data as a .CSV file from within LibreOffice click _File ->
Save As_. On the dialogue that comes up, select the _Text CSV (.csv)_ as the
file type and select the option _Edit filter settings_.
image::images/LOffice_save_as_options.jpg["FIGURE: Save as options", align="center"]
After selecting _Save_, select the appropriate field delimiter (choose _Tab_
to prevent conflicts with the comma when using this as a decimal point),
then select _OK_.
image::images/LOffice_field_options.jpg["FIGURE: Field options", align="center"]
One can double check the .CSV file by opening it with a text editor, and
then import the dive data as explained on the section
xref:S_ImportingCSVDives[Importing CSV dives].
=== Microsoft _Excel_
The field delimiter (called "_list separator_" in Microsoft manuals) is not
accessible from within _Excel_ and needs to be set through the _Microsoft
Control Panel_. After changing the separator character, all software on the
Windows machine use the new character as a separator. One can change the
character back to the default character by following the same procedure,
outlined below.
- In Microsoft Windows, click the *Start* button, and then select _Control
Panel_ from the list on the right-hand side.
- Open the _Regional and Language Options_ dialog box.
- Do one of the following: ** In Windows 7, click the _Formats_ tab, and then
click _Customize this format_. ** In Windows XP, click the _Regional
Options_ tab, and then click _Customize_.
- Type a new separator in the _List separator_ box. To use a TAB-delimited
file, type the word TAB in the box.
- Click _OK_ twice.
Below is an image of the _Control Panel_:
image::images/Win_SaveCSV2.jpg["FIGURE: Win List separator", align="center"]
To export the dive log in CSV format:
With the dive log opened in _Excel_, select the round Windows button at the
top left, then _Save As_.
image::images/Win_SaveCSV1.jpg["FIGURE: Excel save as option", align="center"]
Click on the left-hand part of the _Save as_ option, NOT on the arrow on the
right-hand. This brings up a dialogue for saving the spreadsheet in an
alternative format. From the dropdown list at the bottom of the dialogue,
marked _Save as Type:_, select _CSV(Comma delimited) (*.CSV)_. Ensure that
the appropriate folder has been selected to save the CSV file into.
image::images/Win_SaveCSV3.jpg["FIGURE: Excel save CSV dialogue", align="center"]
Select the _Save_ button. The CSV-formatted file is saved into the folder
that was selected. One can double check the .CSV file by opening it with a
text editor, and then import the dive data as explained on the section
xref:S_ImportingCSVDives[Importing CSV dives].
== APPENDIX E: FAQs.
=== Subsurface appears to miscalculate gas consumption and SAC
[[SAC_CALCULATION]]
'Question': I dived with a 12.2 l tank, starting with 220 bar and ending
with 100 bar, and I calculate a different SAC compared what _Subsurface_
calculates. Is _Subsurface_ miscalculating?
'Answer': Not really. What happens is that _Subsurface_ actually calculates
gas consumption differently - and better - than you expect. In particular,
it takes the incompressibility of the gas into account. Traditionally, Gas
consumption and SAC should be: +consumption = tank size x (start pressure -
end pressure)+
and that's true for an ideal gas, and it's what you get taught in dive
theory. But an "ideal gas" doesn't actually exist, and real gases actually
don't compress linearly with pressure. Also, you are missing the fact that
one atmosphere of pressure isn't actually one bar. So the *real*
calculation is:
+consumption = (amount_of_air_at_beginning - amount_of_air_at_end)+
where the amount of air is *not* just "tank size times pressure in bar".
It's a combination of: "take compressibility into account" (which is a
fairly small issue under 220 bar - you'll see more differences when you do
high-pressure tanks with 300bar) and "convert bar to atm" (which is the
majority of your discrepancy). Remember: one ATM is ~1.013 bar, so without
the compressibility, your gas use is:
+12.2*((220-100)/1.013)+
which is about 1445, not 1464. So there was 19 l too much in your simple
calculation that ignored the difference between 1 bar and one ATM. The
compressibility does show up above 200 bar, and takes that 1445 down about
eight litres more, so you really did use only about 1437 l of air at surface
pressure.
So be happy: your SAC really is better than your calculations indicated. Or
be sad: your cylinder contains less air than you thought it did. And as
mentioned, the "contains less air than you thought it did" really starts
becoming much more noticeable at high pressure. A 400 bar really does not
contain twice as much air as a 200 bar one. At lower pressures, air acts
pretty much like an ideal gas.
=== Some dive profiles have time discrepancies with the recorded samples from my dive computer...
_Subsurface_ ends up ignoring surface time for many things (average depth,
divetime, SAC, etc). 'Question': Why do dive durations in my dive computer
differ from that given by _Subsurface_?
'Answer': For example, if you end up doing a weight check (deep enough to
trigger the "dive started") but then come back up and wait five minutes for
your buddies, your dive computer may say that your dive is 50 minutes long -
because you have fifty minutes worth of samples - but subsurface will say
it's 45 minutes - because you were actually diving for 45 minutes. It's
even more noticeable if you do things like divemastering the initial OW
dives, when you may stay in the water for a long time, but spend most of it
at the surface. And then you don't want that to count as some kind of long
dive”.
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