User manual: Updates for iphone app for subsurface GPS serevice

I did some editing of the image to increase contrast and make the text in
the screen shots more readable. In the process I also reduced the size of
the image substantially. I have also edited the text somewhat.

Signed-off-by: willem ferguson <willemferguson@zoology.up.ac.za>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

Documentation/user-manual.txt

@@ -1239,8 +1239,8 @@ 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
+Using the *Subsurface Companion App* on an _Android device_ with a GPS or
-iPhone, the coordinates
+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
@@ -1440,28 +1440,26 @@ of another registered diver.
 
 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
 
-==== Using the Subsurface companion app on an iPhone smartphone
+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.
 
-The iPhone interface is quite simple. One needs to add the user ID given
+image::images/iphone.jpg["FIGURE: Using iPhone companion application",align="center",width=640]
-during the registration to the space reserved for it as shown on left
-part of the image below.
 
-image::images/iphone.png["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.
 
-Next step is to click "Dive in" and start collecting location
+One can edit the site name afterwards by selecting the dive
-information. Dive can be added automatically or manually. The difference
+from the dive list and clicking on the site name. There are no other
-seems to be whether user is asked for site name or not. When user adds a
+editable fields. The dive list is automatically uploaded from the iphone
-dive, location service is started and there is a red bar at the bottom
+to the webservice and there is not an option to
-of the screen indicating that. After the dive one can click on the red
+trigger upload manually.
-bar to end the dive/location service. Note that when the location
-service is running, one can add dives only manually.
-
-It is possible to change the site name afterwards by selecting the dive
-in question from the dive list and clicking on the site name. Other
-modifications doesn't seem to be possible. The dive list is uploaded
-automatically to webservice and there does not seem to be an option to
-trigger it manually.
 
 
 ==== Downloading dive locations to the _Subsurface_ divelog