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Documentation: update "Start Using the Program"

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Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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Dirk Hohndel 2013-05-13 10:57:06 -07:00
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Documentation/user-manual.txt
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@ -96,7 +96,7 @@ However, great effort was taken to keep the profile simple, yet
informative.
The main information of the dive profile is the depth graph. On top of
the obvious information of the depth it shows also the ascent and
the obvious information of the depth it also shows the ascent and
descent rate compared to the recommended speed of going up or down in
the water column. This information is given using different
colors. Dark red means ascent faster than 18m/60ft per minute or
@ -139,16 +139,38 @@ Tec Information in Dive Profile
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The dive profile can include Tec settings. Enabling these is described
in chapter <<S_SettingUpPreferences,Setting up Preferences>>. Basically
you can include graphs of accumulated pO2, pN2, pHe. These graphs are
added below the profile data. On top of the profile the currently used
gradient factors are shown (e.g. GF 35/75).
in chapter <<S_SettingUpPreferences,Setting up
Preferences>>. Basically you can include graphs of the partial
pressures O2, N2, and He during the dive as well as a calculated deco
ceiling (only visible for deep, long, or repetitive dives).
The graph can also include both the dive computer reported ceiling and
our calculated ceiling. Because of the differences in used algorithms it
is unlikely that both of these are the same. It is even quite common
that Subsurface calculates ceiling for non-decompression dives when the
dive computer was not in deco mode during the dive.
The partial pressure graphs are added below the profile data, the
calculated ceiling is shown as a green overlay on top of the dive
profile. Above the profile the currently used gradient factors are
shown (e.g. GF 35/75). Please note that these are NOT the gradient
factors in use by the dive computer in question, but the gradient
factors used by Subsurface to calculate deco obligations during the
dive.
The graph can also include the dive computer reported ceiling (or more
precisely, the first deco stop that the dive computer recorded - note
that 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). Because of the differences in used algorithms and amount of
data available (and taken into consideration) at the time of the
calculation it is unlikely that both of these are the same; this can
be true even if the same algorithm and gradient factors 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. This is caused by the fact that Subsurface's
calculations describe the deco obligation at that point in time 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 time'.
[[S_ImportNewDives]]
Import New Dives from your Dive Computer