documentation/mobile-manual: create a merged v3 manual

Unintentionally two versions of the mobile manual were created. This brings all
of Willem's changes into the version for Subsurface-mobile v3, and restores the
last version of the v2 mobile manual.

This commit was manually created from a pull request that was signed off by
Willem, given that he wrote most of the text I am copying that SOB into this
commit and will assign authorship to him.

To avoid further confusion, we now have a v2 and a v3 manual, explicitly named.
The corresponding .html.git files were also updated (reflecting our switch to
asciidoctor).

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

1 files changed, 552 insertions, 0 deletions

diff --git a/Documentation/mobile-manual-v2.txt b/Documentation/mobile-manual-v2.txt
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+
+// Subsurface-mobile User Manual
+// =============================
+// :author: Manual authors: Willem Ferguson, Dirk Hohndel
+// :revnumber: 2.1.5
+// :revdate: December 2018
+:icons:
+:toc:
+:toc-placement: manual
+:numbered:
+// :website: http://subsurface-divelog.org
+
+image::mobile-images/Banner.jpg["Banner",align="center"]
+
+[big]#Subsurface-mobile USER MANUAL#
+
+*Manual authors*: Willem Ferguson, Dirk Hohndel
+
+// toc::[]
+
+[blue]#_Version 2.1.5, December 2018_#
+
+Welcome as a user of _Subsurface_ and _Subsurface-mobile_, advanced dive logging
+software with extensive infrastructure to describe, organize, and interpret scuba
+and free dives. _Subsurface_ offers many advantages over other similar
+software solutions, including compatibility with Windows, macOS, Linux (many
+distributions), Android and iOS. In addition, _Subsurface_ is
+open-source software that allows downloading dive
+information from many dive computers.
+
+Introducing Subsurface-mobile
+-----------------------------
+
+_Subsurface-mobile_ is a limited mobile version of _Subsurface_
+aimed at Android and iOS smartphone and tablet devices, allowing viewing, entering, sharing, and storage of dive information at dive sites where a desktop
+computer is not useful. While the desktop version of _Subsurface_ shows much more detailed information
+for each dive, the mobile version allows a more accessible dive log
+on a dive trip, useful for proving dive experience to dive shops or to review
+previous dives. _Subsurface-mobile_ also allows
+the gathering of GPS locations where dives are performed.
+
+Users of _Subsurface-mobile_ typically use the
+mobile app as a companion to the laptop/desktop version of _Subsurface_,  sharing dive information
+between the mobile and the desktop versions. However _Subsurface-mobile_ can
+also be used independently of the desktop version and does not require the use of
+cloud storage.
+
+_Subsurface-mobile_ allows:
+
+- Download and storage of dive log information using the _Subsurface_ cloud.
+- Viewing this information on a mobile device.
+- Manually creating and adding new dive records to your dive log.
+- Download dive data directly from many dive computers.
+- Editing many of the dive log data fields, e.g. dive-master, buddy,
+  equipment or notes relating to a dive.
+- Recording, storing and applying GPS positions of dives.
+- Viewing the localities of recorded GPS positions and of dives
+  on a map.
+
+These items are discussed in greater detail in the following text.
+_Subsurface-mobile_ does not support download of dive data from all the
+dive computers that the desktop/laptop version can. This limitation is
+mainly caused by the inability of accessing some types of devices on the
+two mobile platforms. On Android, a subset of
+dive computers that use a FTDI USB interface or a Bluetooth / Bluetooth LE interface
+are accessible by _Subsurface-mobile_. On iOS, only Bluetooth LE based
+dive computers are supported.
+
+== Installing _Subsurface-mobile_ on your mobile device
+
+Find _Subsurface-mobile_ in the _Google Play Store_ or the _iTunes Store_
+and install it. Please note that both stores also contain the older _Subsurface_ companion app (used only for tracking GPS positions) - make sure you actually install _Subsurface-mobile_.
+
+== Using _Subsurface-mobile_ for the first time
+
+When you start _Subsurface-mobile_ for the first time, a Subsurface
+splash screen is shown while the program loads. On some devices this
+may take several seconds. After loading, the _Cloud Credentials screen_ appears
+(see image below on left).
+
+image::mobile-images/Credentials.jpg["FIGURE: Mobile credentials screen",align="center"]
+
+=== When NOT Using Cloud Storage
+Tap the "No cloud mode" button. The app will not access the _Subsurface_
+cloud storage server
+to obtain dive log information. This means that dive log information is
+stored on the mobile device only. If no dives have been entered into the dive log
+yet (the usual case), an empty dive log is created.
+
+=== Using Cloud Storage
+The _Subsurface_ developers provide a dedicated and
+free Internet cloud storage account that can be used for
+storing dive log information. This account can be created either from _Subsurface_ on the desktop or from _Subsurface-mobile_
+using a mobile device; you can
+do full maintenance of a dive log from _Subsurface-mobile_ alone. By using the same
+credentials with _Subsurface-mobile_ and _Subsurface_ for desktop, the _Subsurface_ cloud storage allows sharing of a dive
+log between both (or even more than two) devices.
+
+The dive data on the cloud are cached locally both on the mobile device as well as on the desktop - it is easy to create backups of the data (for example in XML format) on the desktop: both mobile device and desktop keep a local copy of the data so that the dive log is always accessible, even without Internet connection. The Subsurface team never accesses a user's dive data without explicit permission to do so, the data are not used for any purpose other than providing them to the user who created them. There are no ads and no harvesting / analysis of the data stored in the Subsurface cloud storage.
+
+1) Enter an e-mail address and a password in the fields indicated on the screen (see image above).
+The e-mail address should be in lower case and the password should contain a combination of
+letters from the alphabet (upper and lower case) and/or numbers.
+Tap the "Sign-in or Register" button. If you have already set
+up an account from the _Subsurface_ desktop application, enter the same credentials here.
+Once the dive
+list has been downloaded from the cloud, _Subsurface-mobile_ usually works only with the the local
+copy on the mobile device. This avoids long delays or even failure of operations if there is a bad (or no) internet connection, a situation fairly common at many dive sites. Once registered, _Subsurface-mobile_ remembers the cloud credentials and it is not necessary to provide these again when launching the program.
+
+2) If this is a new cloud account, a PIN screen will open (see image on right, above). A PIN is e-mailed
+to the email address entered in the previous step. Enter this PIN into the field indicated
+and tap the _Register_ button. The user
+information is stored on the cloud server and access to the cloud is enabled. In this case
+the dive list is initially empty. Start entering dives in the dive
+log or download dive information from a supported dive computer.
+
+****
+[icon="images/icons/important.png"]
+[IMPORTANT]
+*Cloud problems: FAQ*
+
+[blue]#After filling in the correct information and submitting it, I did not receive a PIN by email#
+
+1. Check *carefully* that there is not a spelling mistake in the email address you provided.
+2. Check that the return email containing the PIN is not in the SPAM folder of your email client.
+3. Wait for 24 hours and check again for an email with a PIN. 
+4. If there is still no email containing a PIN, send mail to in-app-support@subsurface-divelog.org
+
+[blue]#I want to access the Subsurface cloud facility but I have forgotten my password. How can I reset my password?#
+
+Open the following web address: https://cloud.subsurface-divelog.org/passwordreset
+
+This will require that you enter the same email address that you used during cloud registration.
+****
+
+The dive log can be updated automatically. If there is Internet connectivity, _Subsurface-mobile_ accesses
+the cloud-based dive log to verify that the local copy of the dive log is still the
+same as the log in the cloud server. If not, the local copy and the copy on
+the server are synchronized.
+
+=== Changing the existing login credentials on the _Subsurface_ cloud
+
+The login credentials can be changed, for example to work with
+multiple accounts. See the section on xref:S_ChangeCloudAccount[Changing to a different _Subsurface_ cloud account].
+
+== Getting Support
+
+The best place to get support is the Subsurface User Forum. Additionally, Subsurface-mobile allows you to send a support email by tapping on _Ask for support_ in the main menu. This will open an email to our in app support address in the native email client, including the relevant logs.
+
+== Menu Structure and User Interface
+
+At the bottom of many _Subsurface-mobile_ screens is a round button that provides for
+several actions (see image below). The most common choice is indicated in a round colored _action button_ (in the case below, edit a dive). Alternative actions are indicated in a white _action bar_.
+On Android devices, use the Android Back
+button for "cancel", "discard" or "back" actions. For example, when
+editing dive information, tapping the action button saves the changes while the
+Android back button can be used to cancel the edit without saving changes.
+
+image::mobile-images/Actionbutton.jpg["FIGURE: Action Button",align="center"]
+
+On iOS devices, on screens where a "back" action is enabled, a back arrow
+is shown in the top left corner of the screen.
+
+For a consistent experience between iOS and Android,
+_Subsurface-mobile_ on Android does not use the traditional "hamburger"
+menu button in the top left or right corner of the screen to open menus.
+Instead, _Subsurface-mobile_ uses a
+different user interaction philosophy based on the Kirigami framework
+developed by the Plasma developers. There are three ways to open the main menu:
+
+- Tap the "hamburger" symbol in the lower left corner of the screen
+  (easy to reach for hand held devices)
+- Swipe towards the right across the left edge of the screen
+
+image::mobile-images/Menusystem.jpg["FIGURE: Dive management sub-panel",align="center"]
+
+The image above indicates some of the important features of the menu system.
+On the left is the main menu, activated as described above. On the right of the image
+are the items of all the sub-menus accessible.
+
+All screenshots in this user manual are currently from the Android
+version. The iOS screens look similar.
+
+== The Dive List
+
+Most of the actions of _Subsurface-mobile_ center around the dives on the
+dive list. While the dive list is loading from the cloud,
+a message appears at the bottom of the screen, indicating that the cloud is
+being accessed, after which the dive list is shown. Once the list is loaded you can scroll up and down through your dive history.
+To upload dives from a dive computer, tap the blue action button. If you wish
+to add a dive manually, tap the + button in the action bar (described below).
+Tapping an existing dive on the list brings up a display of the _Details View_ for that dive
+including the dive profile, notes and additional information.
+
+image::mobile-images/Divelist2.jpg["FIGURE: Dive list screen",align="center"]
+
+You can view other dives by swiping the _Details view_ to the right (for the
+previous dive) or to the left (following dive).
+Using the Action Bar, it is also possible to delete the dive (tap the dustbin
+on the Action Bar) or to view the dive
+location on a map viewer (Google Maps on Android, the Google Maps web site
+on iOS; tap the GPS icon on the Action Bar.).
+
+== Filter the dive list
+
+Use this action button:
+
+image::mobile-images/FilterButton.jpg["FIGURE: Filter button",align="center"]
+
+at the bottom of the dive list to perform filtering of the dive list (see image on left above).
+
+image::mobile-images/Filter.jpg["FIGURE: Filter tool",align="center"]
+
+By default, all the dives in the dive log are shown in the dive list. After several years your dive log can become quite long and, sometimes, you might like to list only the dives of a particular type, e.g. those at a particular dive site or those with a specific buddy or dive master. Use the Filter to achieve this. The filter mechanism searches through all the information for each dive, looking for one or more key words. Only the dives containing these key words are listed in the dive list. In the xref:S_Settings[_Settings_] screen there two options that affect the way the filter searches for appropriate information. Firstly, you can select _Match filter case sensitive_ which causes the search of key words to be case sensitive. Secondly, you can select _Include notes in full text filtering_. If this option is not selected, the filter does not search through the dive notes for key words. Selecting the _Filter_ action button brings up a text box at the top of the dive list. Type the key words to be searched for. In the image on the left, the dive list has been filtered for the word "Nitrox" and 265 dives were found containing this word as a tag. For each trip in the dive list the number of dives containing "Nitrox" as a tag is shown. To clear the filter, remove the key words from the text box and select the Filter action button to switch off filtering.
+
+== Viewing the locations of all dives in the dive list
+
+image::mobile-images/DivesMap.jpg["FIGURE: Map of all dive sites",align="center"]
+
+The locations of all dives in the dive list can be viewed from the _Main Menu_ by selecting the _Map_ option.
+A satellite image of the world is shown. At that scale no dive sites are shown. If you zoom into a particular region
+of the world the dive sites appear, indicated by red flags. Zooming in even closer indicates the names of each
+of the different dive sites.
+
+== Viewing the location of a dive on _Google Maps_
+
+image::mobile-images/Map.jpg["FIGURE: Map of dive site",align="center"]
+In the _Details View_, the Action Bar at the bottom has a GPS pin on the
+left hand side. Tap that pin and the dive site is shown in Google Maps. Close Google Maps by using the Android _Back_ button
+or tapping on the _Subsurface-mobile_ link in the top left corner on iOS.
+
+Alternatively, the _Details View_ has a button at the top right hand marked
+_Map it_. Tap this button to open Google Maps showing the dive site (image on left).
+
+[[S_View_Dive]]
+== View a dive
+
+When you tap on a dive in the _Dive List_, a new screen with the dive profile
+and many important details about the dive is opened. You can use a pich gesture
+to zoom into the profile, and tapping with one finger, waiting briefly until
+the profile becomes translucent, and then dragging the finger around allows you
+to pan the profile so the interesting parts are shown.
+
+[[S_Edit_Dive]]
+== Edit a particular dive
+
+image::mobile-images/Editdive.jpg["FIGURE: Dive edit screen",align="center"]
+At the bottom of the _Dive Details_ screen the action button is a pencil.
+Tapping the pencil button changes the page and enables edit boxes that allow
+modifying the existing dive information, e.g. adding text to the dive notes
+or changing the names or values of some of the information (see image on left).
+It may be necessary to scroll the window to access all the information.
+At the bottom of the edit screen is a _Save_ action button. Tap this to save
+the new information, after which the dive list screen is
+updated and shown. To cancel any edits, tap the Android _Back_ Button or
+the application back button at the top left of the screen on iOS.
+
+[[S_Add_Dive]]
+== Manually adding a new dive to the dive list
+
+You can manually add a dive to the existing dive list. On the dive list
+tap the "plus" sign in the action bar, or use the
+main menu and tap _Dive management  ->  Add dive manually_. This opens  a screen that is
+identical to the editing screen discussed above. When a dive is added manually, you
+cannot directly add a dive profile from a dive computer. However, if you do not use a
+dive computer, the duration, depth and several other bits of information about
+the new dive can be entered. The _Action button_ at the bottom of the screen
+contains a disk symbol. Tap this to save the new dive. To cancel any edits, tap the _Back_ button.
+The left-hand image below shows a screenshot of a dive being created and the right-hand image shows
+the same dive in _Details View_.
+
+image::mobile-images/Manualdive.jpg["FIGURE: Manual dive entry screen",align="center"]
+
+== Copy dive information from one dive to another
+
+When editing dives it is possible to transfer information from one dive to another. For instance,
+when diving with the same buddy and the same equipment configuration during a particular dive trip
+it can be efficient to simply copy all this information from the previous dive into the dive that
+is being edited. Currently a standard list of dive information is copied to the clipboard:
+
+Divemaster, Buddy, Suit, Tags, Cylinders, Weights.
+
+Copy and paste dive information is performed on the Dive List. Long-press on a dive. A panel
+with three icons appears on top the selected dive :
+
+image::mobile-images/CopyDeleteDive.jpg["FIGURE: Copy/Delete dive information",align="center"]
+
+To copy the above information to the clipboard, select the leftmost of the three icons. A "Copy"
+notification briefly appears on the screen. Now long-press the dive into which the copied information
+needs to be pasted. The same three icons appear on the target dive. Select the middle icon. A "Paste"
+notification briefly appears on the screen. This completes the copy-and-paste action. Continue by
+reviewing this new (pasted) information by manually editing the target dive.
+
+To choose what dive details to copy, long-press the copy button. This will open
+up a configuration page where you can toggle the details you want to copy over
+to the destination.
+
+== Deleting a dive
+
+Delete a dive from the dive list by long-pressing a dive
+until a red dustbin appears on the right-hand side (see image above). Tap the dustbin.
+The dive is deleted without asking any confirmation because _Subsurface-mobile_ assumes that the
+combination of a long tap on the dive with another tap on the red dustbin is an unambiguous
+instruction to delete the dive.
+
+To choose what dive details to copy, long-press the copy button. This will open
+up a configuration page where you can toggle the details you want to copy over
+to the destination. By default, the following fields are copied:
+
+image::mobile-images/Delete_undo.jpg["FIGURE: Undo delete dive",align="center"]
+
+[[S_Download]]
+== Download dives from a dive computer
+
+From the main menu,
+tap _Manage dives ->  Download from DC_. A screen is shown requiring that the user specify
+the names of the vendor and model of the dive computer. For instance, when using a Shearwater Petrel dive
+computer, the vendor is _Shearwater_ and the Dive computer name is _Petrel_(see image on the left, below).
+*Caveats:* The download feature in smartphones supports only a limited number of dive computers. On
+Android devices these are typically dive computers using an FTDI interface
+using a USB OTG cable (but this is blocked on some Android devices by OS
+settings). Android devices also support Bluetooth dive computers that
+are supported in _Subsurface_ on the desktop. Both Android and iOS devices allow direct
+download of dive data from a handful of Bluetooth LE enabled dive
+computers. Use the _Vendor name_ and _Dive Computer_ drop-downs to pick the correct
+dive computer. When downloading from multiple different dive computers, shortcut
+buttons appear below the drop-downs to easily switch between them. In the xref:S_Settings[_Settings_] menu
+you can remove these buttons, a useful feature for removing buttons of dive
+computers that are not used any more. Achieve this by selecting the option 
+_Forget remembered dive computers_ in the xref:S_Settings[_Settings_] menu.
+After all these caveats, let us proceed with download. 
+
+*For USB FTDI dive computers:*
+This feature is not supported on iOS and on most newer Android devices. It still works on some older
+Android devices (typically Android 7 and older) and is kept enabled for this
+reason. Note: USB cables "normally" used for uploading dives to a
+desktop/laptop computer do NOT work; these
+cables usually have a full-sized ("Type A") male USB plug
+on one end which plugs into the USB port of a desktop/laptop computer. For downloads to a mobile device
+one needs a USB OTG (USB On-The-Go) cable.
+
+[width="100%", frame="None"]
+|=======
+a|image::mobile-images/USB-OTG.jpg["FIGURE: USB-OTG cable",align="center"] | 
+In most cases it is required to plug the USB
+cable "normally" used with the dive computer into a USB OTG cable which,
+in turn, plugs into the mini-USB (or sometimes a USB "Type C")
+receptacle of the mobile device. The
+OTG cable usually has a full-size ("Type A") female receptacle at one end which
+accommodates the full-sized male plug
+of the USB cable "normally" used (see image below). This means that two cables are used to connect
+the dive computer to the mobile device. *Not all Android devices support OTG cables*
+and even on some devices that do support those cables in general, as mentioned above _Subsurface-mobile_
+does usually not support cable based downloads, except on some older Android devices.
+|=======
+
+_Subsurface_ remembers the settings for dive computers that
+have been successfully used (image on right, below). These appear
+as buttons under a heading "_Previously used dive computers_".
+Select the appropriate button. Having connected the USB dive computer to the
+_Subsurface_ computer and having selected the appropriate vendor and dive computer,
+ensure that the Connection text box shows "FTDI". 
+
+*For BLUETOOTH/BTLE dive computers:* The process for Bluetooth download is slightly different between Android and iOS.
+In our testing we got the best results on iOS when the dive computer was
+in Bluetooth mode before _Subsurface-mobile_ is started. On most dive
+computers this is done through a menu entry, others (like the Suunto
+models) always respond to BTLE requests. However, on Android devices,
+you should first establish a link between the
+Bluetooth or Bluetooth LE dive computer and the mobile device using
+Android utilities. See below for more details.
+
+For Bluetooth-equipped dive computers and Android devices, establish a Bluetooth connection between the dive computer and the
+mobile device. Use the tools on the mobile device to achieve pairing between the Bluetooth dice computer
+and the mobile device. For many Android devices,
+the Settings -> Bluetooth tool of Android is probably appropriate.
+_Subsurface-mobile_ performs communication using both Bluetooth and Bluetooth-low-energy (BTLE).
+The appropriate choice of Bluetooth communication is often made by the software and the user need not be concerned with this.
+For dive computers with both Bluetooth and Bluetooth-low-energy (BTLE), a separate button is presented on the download
+screen for each mode of communication, allowing a choice. Use the _Connection_ value to distinguish between the
+two options. In the image on the right, below, there are three buttons labeled "Shearwater Petrel 2". These represent two Shearwater Petrel dive computers, one of which can communicate in both Bluetooth as well as BTLE. The _Connection_
+information indicates that the Petrel with no BTLE is selected.
+
+*DOWNLOAD:* With communication between dive computer and _Subsurface-mobile_
+having been set up, tap the _Download_ button. Be patient because the download can take a few minutes.
+As a matter of fact, a complete first download from some dive computers can take 45 minutes or longer.
+The downloaded dives appear in the bottom part of the screen,
+the most recent dive at the top (see image on right, below). 
+
+Each dive has a check-box on the left hand side, used for selecting which dives you want to be added to the
+_Subsurface-mobile_ dive list: dives that are not checked are ignored. With the appropriate downloaded dives
+having been checked, tap the button at the bottom left labeled _Accept_. All the selected dives appear on
+the _Subsurface-mobile_ dive list. The downloaded dive information can now be edited as described in the section
+above xref:S_Edit_Dive[Edit a dive].
+
+image::mobile-images/DC-Download.jpg["FIGURE: DC download screen",align="center"]
+
+== Dive log management
+
+A central  part of _Subsurface-mobile_ is the ability to store the dive
+log using the _Subsurface_ cloud storage.
+This provides security against loss or damage of the dive information in a local copy
+and allows the desktop version of _Subsurface_ to
+access changes made using the mobile device. This ability is accessed
+through the main menu
+(by tapping the "Hamburger" icon at the bottom left of the screen).
+Tap the option _Dive management_, enabling a number of options:
+
+=== Add new dive manually
+
+This is described above under the section dealing with xref:S_Add_Dive[Manually adding a new dive to the dive list].
+
+=== Download from DC
+
+This is described above under the section dealing with xref:S_Download[Download dives from a dive computer].
+
+=== Apply GPS fixes
+
+This is described in the following main section, below.
+
+=== Manually sync the dive log with the _Subsurface_ cloud storage
+
+Upload the dives contained on the mobile device
+to the _Subsurface_ cloud storage by tapping the option _Manual sync with cloud_.
+This synchronizes the local changes to
+the dive log with the cloud storage. It also downloads changes made to
+the dive log using another device or computer and stored in shared cloud storage.
+
+=== Enable cloud auto sync
+
+By default _Subsurface-mobile_ runs offline and only syncs the dive list
+with cloud storage when explicitly told to do so (see above).
+You can choose to always sync with the cloud servers. This is not
+recommended unless you are in
+an area with a fast and reliable internet connection, as otherwise
+_Subsurface-mobile_ might appear to hang between operations as it tries to
+connect to the cloud server. Selecting _Enable cloud auto sync_ causes
+the local dive log to be synchronized with the copy in the cloud every time that
+_Subsurface-mobile_ is closed.
+
+== Recording dive locations using GPS
+
+The fact that most smartphones have GPS facilities allows
+_Subsurface-mobile_ to record
+the locations of dives. *IMPORTANT: GPS-derived coordinates on a smartphone
+are not always accurate and can have an error greater than 1 km. GPS accuracy
+is determined by the hardware and software of the
+smartphone as well as by the GPS settings selected within Android/iOS.
+As of Android V6 select Android _Settings -> Communication -> Location -> High accuracy._*
+If the smartphone is taken on the boat
+during a dive, locations will be automatically recorded at regular intervals.
+These locations can then be applied to dives in the dive list. Here is how it's done:
+
+[[S_ConfigureGPS]]
+=== Configuring the GPS service
+
+From the _Main Menu_, select xref:S_Settings[_Settings_] screen which has a section for
+configuring the GPS service (image below). GPS location data
+are collected at regular intervals, e.g. every 5 minutes, or at regular
+distances, e.g. after the boat has moved more than 200m, or a combination of
+both of these approaches. Provide the appropriate information and
+tap the _Back_ button. The program is now ready to collect GPS positions.
+
+image::mobile-images/GPS-config.jpg["FIGURE: GPS configure",align="center"]
+
+=== Collecting GPS positions
+
+[width="100%", frame="None"]
+|=======
+a|image::mobile-images/GPSstart.jpg["FIGURE: GPS start",align="center"] | 
+On the _Main Menu_ select _GPS -> Run location service_.
+_Subsurface-mobile_ starts to collect GPS locations automatically,
+following the preferences specified as described above. While the GPS
+location service is running, all menus have a GPS symbol at the bottom
+of the menu, indicating that the service is active. After return from
+the dive trip, deactivate the collection of GPS data by tapping
+the option _GPS -> Disable location service_. The GPS symbol at the bottom
+of all menus disappears.
+|=======
+
+=== Viewing GPS data
+
+From the _GPS_ submenu select _Show GPS fixes_. This brings
+up a list of GPS positions obtained by the location service (image
+below). Two actions are possible for each of the locations, enabled by
+dragging the right part of a location to the left. This exposes two
+options. Tapping the dustbin deletes this particular GPS location. Tapping the
+teardrop-shaped icon (actually a Google Maps pin) opens up Google Maps with a pin
+indicating the exact map position of the GPS record being viewed. The two above
+options can be hidden by drawing the GPS record to the right.
+
+image::mobile-images/gpsmanagement.jpg["FIGURE: GPS management",align="center"]
+
+=== Applying GPS data to dives in the dive log
+
+Assuming that all the dives have been entered into the dive log or have
+been downloaded from the _Subsurface_ cloud, apply the GPS positions to
+these dives. GPS positions can only be applied to dives in the dive list.
+From the _Dive management_ sub-panel, tap _Apply GPS fixes_. The dive list contains the start
+and end times of each dive. Now, _Subsurface-mobile_ applies the first
+GPS position that falls within the dive period of each dive. This results
+in a GPS position for each dive that is saved as part of the dive log.
+
+[[S_Settings]]
+== Specifying the settings for _Subsurface-mobile_.
+
+The _Settings_ screen allows the customization of _Subsurface-mobile_. Many of the settings involve dragging a slider switch to activate or deactivate a particular setting.
+
+[[S_ChangeCloudAccount]]
+=== Changing to a different _Subsurface_ cloud account
+
+Some users have more than one _Subsurface_ cloud account and have a need to switch between accounts. Tap _Settings_ on the Main menu and scroll to the section titled _Cloud status_ (see image below).
+Tap the _Change_ button. This opens the _Cloud credentials_ screen.
+change the credential information, then tap the button _Sign-in or register_. The appropriate dive list is shown.
+
+image::mobile-images/SettingsCloudTheme.jpg["FIGURE: Settings: Cloud & Theme",align="center"]
+
+=== Changing the color theme of _Subsurface-mobile_
+
+[width="100%", frame="None"]
+|=======
+a|image::mobile-images/PinkTheme.jpg["FIGURE: GPS start",align="center"] | 
+_Subsurface-mobile_ has three color schemes to please users with different
+tastes (see image above). This user manual shows the default color scheme, comprising blue
+colors. Change to a pink or a dark color scheme by opening the main menu,
+tap _Settings_, and scroll to the section with heading _Theme_ (see image above).
+Select the appropriate color theme by dragging the appropriate slider on the right-hand.
+On the left is the dive list after selecting the Pink theme.
+|=======
+
+=== Configuring the GPS webservice
+
+The Settings screen allows one to set up the way in which GPS positions are collected during dives. See the section on xref:S_ConfigureGPS[Configuring the GPS service].
+
+=== Activating the Developer sub-menu
+
+The information in the subsurface.log generated while running _Subsurface-mobile_, plus some additional information for understanding the screen rendering of dive information as well as the way in which _Subsurface-mobile_ processed information during a specific occasion while running the app (see section below) is available through a _Developer_ menu at run time. Activate (or deactivate) this menu item on the Main Menu by dragging the slider switch in the Settings screen.
+If _Display developer menu_ has been activated in the _Settings screen_, the Main menu has a _Developer_ item. By tapping this one has two options that are relevant within
+the context of program development and debugging.
+
+=== App log
+
+This option shows the messages that _Subsurface-mobile_ generates while running. While
+most users are not aware of these messages, they are often crucial in detecting any
+abnormal behavior of the app. The App log can be found in the root directory of the local storage of the mobile device.
+
+=== Theme information
+
+This option provides a wealth of information about the screen characteristics of the mobile
+device and the font characteristics used by _Subsurface-mobile_.
+
+