Usermanual update.

1) Several layout changes including banner.
2) Stylistic revision of part of textr.
3) Addition of text to dive computer upload section.

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

1 files changed, 64 insertions, 43 deletions

diff --git a/Documentation/user-manual.txt b/Documentation/user-manual.txt
index 939c48a5e..1d5f37bc1 100644
--- a/Documentation/user-manual.txt
+++ b/Documentation/user-manual.txt
@@ -1,18 +1,29 @@
-Subsurface 4.0 User Manual
-==========================
-:author: Manual authors: Jacco van Koll, Dirk Hohndel, Reinout Hoornweg, Linus Torvalds, Miika Turkia, Amit Chaudhuri, Jan Schubert, Willem Ferguson
-
-:revnumber: 4.0
-:revdate: December 2013
-:toc:
+// Subsurface 4.0 User Manual
+// ===========================
+// :author: Manual authors: Jacco van Koll, Dirk Hohndel, Reinout Hoornweg, Linus Torvalds, Miika Turkia, Amit Chaudhuri, Jan Schubert, Willem Ferguson
+// :revnumber: 4.0
+// :revdate: December 2013
 :icons:
+:toc:
+:toc-placement: manual
 :numbered:
-:website: http://subsurface.hohndel.org
+// :website: http://subsurface.hohndel.org
+
+image::images/SubsurfaceBanner.png["Banner",align="center"]
+
+[big]#USER MANUAL#
+
+*Manual authors*: Jacco van Koll, Dirk Hohndel, Reinout Hoornweg, Linus Torvalds, Miika Turkia, Amit Chaudhuri, Jan Schubert, Willem Ferguson
+
+[blue]#_Version 4.0,  December 2013_#
 
-Welcome as a user of _subsurface_, an advanced dive logging programme with extensive infrastructure to describe, organise and interpret scuba and free dives. _subsurface_ runs on many hardware platforms and software environments. These include Linux (many distros), Mac (OS/X) and Windows (Win XP or later). The scope of this document is the use of the _subsurface_ program. To install the software, consult the *Downloads* page on the http://subsurface.hohndel.org/[_subsurface_ web site]. Please discuss issues with this program by writing email to mailto:subsurface@hohndel.org[our mailing list] and report bugs at http://trac.hohndel.org[our bugtracker].  For instructions on how to build the software and (if needed) its dependencies please consult the README file included with the source code.
+
+Welcome as a user of _subsurface_, an advanced dive logging programme with extensive infrastructure to describe, organise and interpret scuba and free dives. _subsurface_ runs on many hardware platforms and software environments. These include Linux (many distros), Mac (OS/X) and Windows (Win XP or later). The scope of this document is the use of the _subsurface_ program. To install the software, consult the _Downloads_ page on the http://subsurface.hohndel.org/[_subsurface_ web site]. Please discuss issues with this program by writing email to mailto:subsurface@hohndel.org[our mailing list] and report bugs at http://trac.hohndel.org[our bugtracker].  For instructions on how to build the software and (if needed) its dependencies please consult the README file included with the source code.
 
 *Audience*: Recreational Scuba Divers, Free Divers, Tec Divers, Professional Divers
 
+toc::[]
+
 [[S_StartUsing]]
 Start Using the Program
 -----------------------
@@ -37,11 +48,11 @@ You can determine which of the four panels you wish to see by selecting *View* o
 
 *All*: show all four of the above panels.
 
-*Divelist*: Show only the dive list. One can select and highlight a dive on the dive list by clicking on it.
+*Divelist*: Show only the Dive List. One can select and highlight a dive on the dive list by clicking on it.
 
-*Profile*: Show only the profile of the highlighted dive in the dive list.
+*Profile*: Show only the Dive Profile of the highlighted dive in the dive list.
 
-*Info*: Show only the textual information about the highlighted dive.
+*Info*: Show only the Dive Notes about the highlighted dive.
 
 *Globe*: Show only the world map, centered on the highlighted dive.
 
@@ -50,9 +61,9 @@ at all. This is because the program doesn't have any dive information available.
 
 1) Create a new logbook in which you can store dive data.
 
-2) Store dive information in the new logbook.
+2) Enter information in the new logbook.
 
-3) Save the information in your logbook.
+3) Save your logbook.
 
 [[S_NewLogbook]]
 Creating a new logbook
@@ -68,12 +79,12 @@ There are several ways to obtain dive information to view:
 
 2. Import dive information directly from a dive computer if it is supported by _subsurface_. The latest list of dive computers supported by _subsurface_ can be found at: link:http://subsurface.hohndel.org/documentation/supported-dive-computers/[Supported dive computers].
 
-3. Import dive information from another file format. This is discussed in more detail below.
+3. Import dive information from another data base or file format. This is discussed in more detail below.
 
 [[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 written dive logbook includes dive type, date, time, duration of dive, depth of dive, name of buddy and of dive master and some remarks about the dive. _subsurface_ can store much more information than this for each dive. In order to add a dive to your dive log, click on _Log -> Add Dive_. The program then shows three panels to enter information for a dive: two tabs in the *Info* panel (*Dive Notes* and *Equipment*), as well as the *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. We will now consider each of the tabs used for data entry.
+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 written dive logbook includes dive type, date, time, duration of dive, depth of dive, name of buddy and of dive master and some remarks about the dive. _subsurface_ can store much more information than this for each dive. In order to add a dive to your 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 (*Dive Notes* and *Equipment*), as well as the *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. We will now consider each of the tabs used for data entry.
 
 image::images/AddDive1.jpg["The most important parts of the _subsurface_ window for manual data entry",align="center"]
 
@@ -87,7 +98,7 @@ The *Starttime* field contains five data items reflecting the date and the time
 
 *Air/water temperatures*: Type in the air and water temperatures during the dive into these fields to the right of the Starttime. You do not need to type in units of temperature: subsurface supplies these automatically, you only need type the number. (The units selected in the 'Preferences' [red]#[[URL link]]# will determine whether metric or imperial units are displayed)
 
-*Location*: Here type in text that describes the site where you did this dive, e.g. "Lake Balaton, Hungary".
+*Location*: Here type in text that describes the site where you did this dive, e.g. "Tihany, Lake Balaton, Hungary".
 
 *Coordinates*: The geographic coordinates of the dive site should be entered here. These can come from three sources:
 
@@ -112,13 +123,13 @@ c. You can obtain the coordinates from a helper program if your mobile phone has
 
 *Notes*: Type any additional information here.
 
-The *Save* and *Cancel* buttons are used to save all the information for the dive after all the other information has been added. Here is an example of a completed Dive Notes panel:
+The *Save* and *Cancel* buttons are used to save all the information for the whole dive after ALL the other information has been added. Do NOT use them before also completing the *Equipment* tab as well as the *Dive Profile*. Here is an example of a completed Dive Notes panel:
 
 image::images/CompletedDiveInfo.png["Example: A completed Dive Notes tab",align="center"]
 
 ==== Equipment
 
-The Equipment tab allows the user to enter information about the type of cylinder and gas you used, as well as the weighting for that dive. The message in a blue box at the top of the panel:
+The Equipment tab allows the user to enter information about the type of cylinder and gas used, as well as the weighting for a dive. The message in a blue box at the top of the panel:
 
 image::images/BlueEditBar.png["Blue edit bar",align="center"]
 
@@ -128,7 +139,7 @@ indicates that one is in the process of adding equipment information for the div
 
 image::images/CylinderDataEntry1.png["Initial cylinder dialogue",align="center"]
 
-The + icon at the top right allows one to add more cylinders for this dive. The dark dustbin icon on the left allows one to delete information for a cylinder.
+The + button at the top right allows one to add more cylinders for this dive. The dark dustbin icon on the left allows one to delete information for a cylinder.
 
 Start by selecting a cylinder type. The AL80 cylinder is shown as the default cylinder type. If you wish to change this, click on the AL80. This will bring up a dropdown list, accessible through a down-arrow:
 
@@ -136,13 +147,13 @@ image::images/CylinderDataEntry2.png["The cylinder drop-down list button",align=
 
 Use the dropdown list to select the cylinder type you used for this dive. The *Size* of the cylinder as well as its working pressure (*WorkPress*) will automatically be shown in the dialogue.
 
-Now you need to indicate the starting pressure and the ending pressure of the specified gas during your dive. The unit of pressure (metric/imperial) corresponds to the setting you chose in the preferences [red]#[[LINK]]#.
+Now you need to indicate the starting pressure and the ending pressure of the gas used during your dive. The unit of pressure (metric/imperial) corresponds to the setting you chose in the preferences [red]#[[LINK]]#.
 
-Finally you need to type in the gas mixture that you used. If you used air, you can enter 21% or leave the field blank. If you used nitrox or trimix, specify the percentage of oxygen and the percentage of helium. Leave any inappropriate fields empty. Add information for any additional cylinders by using the + icon at the top right hand. Here is an example of a complete description for a dive using two cylinders (air and EAN40):
+Finally you need to type in the gas mixture that you used. If you used air, you can enter 21% or leave the field blank. If you used nitrox or trimix, specify the percentage of oxygen and the percentage of helium. Leave any inappropriate fields empty. Add information for any additional cylinders by using the + button at the top right hand. Here is an example of a complete description for a dive using two cylinders (air and EAN40):
 
 image::images/CylinderDataEntry3.png["Example: a completed cylinder dive information table",align="center"]
 
-*Weights*: Information about the weighting system used during a dive can be entered using a dialogue very similar to that of the cylinder information. If you click the + icon on the top right of the weights dialogue, the table looks like this:
+*Weights*: Information about the weighting system used during a dive can be entered using a dialogue very similar to that of the cylinder information. If you click the + button on the top right of the weights dialogue, the table looks like this:
 
 image::images/WeightsDataEntry1.png["The Weights dialogue",align="center"]
 
@@ -150,10 +161,11 @@ If you click on the *Type* field, a dropdown list becomes accessible through a d
 
 image::images/WeightsDataEntry2.png["Weights type drop-down list button",align="center"]
 
-Use the dropdown list to select your type of weighting system. In the *Weight* field, type in the weight used during the dive. It is possible to enter information for more than one weighting system by adding an additional system using the + icon on the top right hand. Weighting 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:
+Use the dropdown list to select your type of weighting system. In the *Weight* field, type in the weight used during the dive. It is possible to enter information for more than one weighting system by adding an additional system using the + button on the top right hand. Weighting 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.png["Example: A completed weights information table",align="center"]
 
+Do NOT select the _Save_ button before you have completed the dive profile.
 
 ==== Creating a Dive Profile
 
@@ -161,21 +173,21 @@ The *Dive Profile* (a graphical representation of the depth of your dive as a fu
 
 image::images/DiveProfile1.png["Initial dive profile",align="center"]
 
-_Configuring the dive profile_: When one moves the cursor around the dive profile, its position is indicated by two red lines as shown above. The depth and time that the cursor represents are indicated, respectively on the left hand and bottom axes. The units (metric/imperial) on the axes are determined by the *preference* settings [red]#[[LINK]]#. The dive profile itself comprises several line segments demarcated by waypoints (white dots on the profile, as shown above). The default dive depth is 15m. If your dive depth was 21m then you need to drag the appropriate waypoints downwards to represent 21m. To add a waypoint, double-clicking on any line segment. To remove a waypoint, right-click on it and choose "Remove this point" from the context menu. You will also need to drag the waypoints to represent an accurate time duration for your dive. Below is a dive profile that represents a dive to 21m for 31 min., followed by a 3 minute safety stop at 5m.
+_Configuring the dive profile_: When one moves the cursor around the dive profile, its position is indicated by two red lines as shown above. The depth and time that the cursor represents are indicated, respectively on the left hand and bottom axes. The units (metric/imperial) on the axes are determined by the *preference* settings [red]#[[LINK]]#. The dive profile itself comprises several line segments demarcated by waypoints (white dots on the profile, as shown above). The default dive depth is 15m. If your dive depth was 21m then you need to drag the appropriate waypoints downwards to represent 21m. To add a waypoint, double-click on any line segment. To remove a waypoint, right-click on it and choose "Remove this point" from the context menu. You will also need to drag the waypoints to represent an accurate time duration for your dive. Below is a dive profile that represents a dive to 21m for 31 min., followed by a 3 minute safety stop at 5m.
 
 image::images/DiveProfile2.png["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 performed by clicking on the gas description for a particular segment and selecting the appropriate choice from the context menu. Note that only the gases defined in the *Equipment* tab appear in the context menu:
+_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 performed by clicking on the gas description for a particular waypoint and selecting the appropriate choice 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.png["Gas composition context menu",align="center"]
 
-If one inadvertently clicks on the gas composition but one does not wish to change this, press the ESCAPE keyboard button. Below is the profile of a dive to 21m for 31 min. with a switch from air to EAN40 on the ascent. In this case the first cylinder in the *Equipment* tab contained air and the second cylinder contained EAN40.
+Below is the profile of a dive to 21m for 31 min. with a switch from air to EAN40 on the ascent. In this case the first cylinder in the *Equipment* tab contained air and the second cylinder contained EAN40.
 
 image::images/DiveProfile4.png["Example: Completed dive profile",align="center"]
 
 ==== Saving the hand-entered dive information
 
-The information entered in the *Dive Notes* tab, the *Equipment* tab as well as the dive profile can now be saved in your logbook by using the two buttons on the top right hand of the Dive Notes tab. If one clicks _Save_, the dive data are saved. If a logbook file hasn't been selected before, one can now select name and place to store the logbook otherwise it is saved in the already opened logbook. If one clicks _Cancel_, the newly entered dive data are deleted. When one exits _subsurface_ there is a final prompt to confirm that the new data should be saved.
+The information entered in the *Dive Notes* tab, the *Equipment* tab as well as the *Dive Profile* can now be saved in your logbook by using the two buttons on the top right hand of the Dive Notes tab. If one clicks _Save_, the dive data are saved. If a logbook file hasn't been selected before, one can now select the file name and directory to store the logbook, otherwise it is saved in the already opened logbook. If one clicks _Cancel_, the newly entered dive data are deleted. When one exits _subsurface_ there is a final prompt to confirm that the new data should be saved.
 
 
 [[S_ImportNewDives]]
@@ -195,7 +207,7 @@ not recharge through the USB connection. Please consult the manual of
 your dive computer if you are unsure if it will recharge or drain its
 batteries while connected to the USB port.
 
-To import dive information from a dive computer to your computer with _subsurface_, it is necessary that the two pieces of equipment must communicate. In order to set up this communication, you need to find the appropriate information to instruct _subsurface_ where and how to import the dive information. *Appendix A* provides the technical information to help you achieve this for different operating systems and *Appendix B* has divecomputer specific information.
+To import dive information from a dive computer to your computer with _subsurface_, it is necessary that the two pieces of equipment must communicate. In order to set up this communication, you need to find the appropriate information to instruct _subsurface_ where and how to import the dive information. *Appendix A* provides the technical information to help you achieve this for different operating systems and *Appendix B* has dive computer specific information.
 
 Now it is time to hook up your dive computer to your PC:
 
@@ -205,7 +217,7 @@ Now it is time to hook up your dive computer to your PC:
  - Put your dive computer into PC Communication mode.
 	(You should consult the manual of your specific dive computer for your brand and type)
 
- - In Subsurface, from the main menu, select _Import -> Import From Dive Computer_. The following dialogue appears:
+ - In _subsurface_, from the main menu, select _Import -> Import From Dive Computer_. The following dialogue appears:
 
 
 image::images/ImportFromDC1.png["Download dialogue 1",align="center"]
@@ -218,15 +230,24 @@ Often, dive computers retain all their dives even though these dives have been i
 
  -  Click the _OK_ button.
 
- - If there is a problem in communicating with your dive computer, an error message will be shown, similar to this text: "Unable to open /dev/ttyUSB0 Mares (Puck Pro)". In this case, consult *Appendix A* for information specific to the operating system of your _subsurface_ computer and consult *Appendix B* for information specific to some dive computers.
+ - If there is a problem in communicating with your dive computer, an error message will be shown, similar to this text: "Unable to open /dev/ttyUSB0 Mares (Puck Pro)". In this case, consult *Appendix A* for information specific to the operating system of your _subsurface_ computer and consult *Appendix B* for information specific to some dive computers. 
+
+[icon="images/icons/important.png"]
+[IMPORTANT]
+In the case of *communication failure* then check the following:
+1) Is the dive coputer still in PC-communication or Upload mode?
+2) Is the battery of the dive computer fully loaded? If not then load or replace the battery.
+3) Is the cable faulty? Does the cable work perfectly using other software? Has it worked before, or is this the first time you are using the cable?
+4) Consult *Appendix A* and make sure you specified the correct Mount Point (see above). If your _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 communcation failure between dive computer and _subsurface_ computer.
+
 
  - With communication established, watch how your data is retrieved from your dive computer!
-   Depending on your type of computer and/or number of dives, this
-   could take some time. Please be patient. The import dialogue shows a progress bar at the bottom of the dialogue:
+   Depending on your make of computer and/or number of dives, this
+   could take some time. Please be patient. The _Download_ dialogue shows a progress bar at the bottom of the dialogue:
 
 image::images/ImportFromDC2.png["Download dialogue 2",align="center"]
 
-When download of the dive information is complete, all the imported dives appear on your Dive List, sorted by date and time. Switch off your dive computer to conserve its battery power.
+When 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 one selects a particular dive, the Dive Profile panel shows an informative graph of dive depth against time for that particular dive.
 
 [[S_EditDiveInfo]]
@@ -269,7 +290,7 @@ c. You can obtain the coordinates from a helper program if your mobile phone has
 
 *Notes*: Type any additional information here.
 
-The *Save* and *Cancel* buttons are used to save all the information for the dive after all the other information has been added. Here is an example of a completed Dive Notes panel:
+The *Save* and *Cancel* buttons are used to save all the information for the whole dive after ALL the other information has been added. Do NOT use them before also completing the Equipment tab. Here is an example of a completed Dive Notes panel:
 
 image::images/CompletedDiveInfo.png["Example: A completed Dive Notes tab",align="center"]
 
@@ -285,7 +306,7 @@ indicates that one is in the process of adding equipment information for the div
 
 image::images/CylinderDataEntry1.png["Initial cylinder dialogue",align="center"]
 
-The + icon at the top right allows one to add more cylinders for this dive. The dark dustbin icon on the left allows one to delete information for a cylinder.
+The + burron at the top right allows one to add more cylinders for this dive. The dark dustbin icon on the left allows one to delete information for a cylinder.
 
 Start by selecting a cylinder type. The AL80 cylinder is shown as the default cylinder type. If you wish to change this, click on the AL80. This will bring up a dropdown list, accessible through a down-arrow:
 
@@ -295,11 +316,11 @@ Use the dropdown list to select the cylinder type you used for this dive. The *S
 
 Now you need to indicate the starting pressure and the ending pressure of the specified gas during your dive. The unit of pressure (metric/imperial) corresponds to the setting you chose in the preferences [red]#[[LINK]]#.
 
-Finally you need to type in the gas mixture that you used. If you used air, you can enter 21% or leave the field blank. If you used nitrox or trimix, specify the percentage of oxygen and the percentage of helium. Leave any inappropriate fields empty. Add information for any additional cylinders by using the + icon at the top right hand. Here is an example of a complete description for a dive using two cylinders (air and EAN40):
+Finally you need to type in the gas mixture that you used. If you used air, you can enter 21% or leave the field blank. If you used nitrox or trimix, specify the percentage of oxygen and the percentage of helium. Leave any inappropriate fields empty. Add information for any additional cylinders by using the + button at the top right hand. Here is an example of a complete description for a dive using two cylinders (air and EAN40):
 
 image::images/CylinderDataEntry3.png["Example: a completed cylinder dive information table",align="center"]
 
-*Weights*: Information about the weighting system used during a dive can be entered using a dialogue very similar to that of the cylinder information. If you click the + icon on the top right of the weights dialogue, the table looks like this:
+*Weights*: Information about the weighting system used during a dive can be entered using a dialogue very similar to that of the cylinder information. If you click the + button on the top right of the weights dialogue, the table looks like this:
 
 image::images/WeightsDataEntry1.png["The Weights dialogue",align="center"]
 
@@ -307,13 +328,13 @@ If you click on the *Type* field, a dropdown list becomes accessible through a d
 
 image::images/WeightsDataEntry2.png["Weights type drop-down list button",align="center"]
 
-Use the dropdown list to select your type of weighting system. In the *Weight* field, type in the weight used during the dive. It is possible to enter information for more than one weighting system by adding an additional system using the + icon on the top right hand. Weighting 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:
+Use the dropdown list to select your type of weighting system. In the *Weight* field, type in the weight used during the dive. It is possible to enter information for more than one weighting system by adding an additional system using the + button on the top right hand. Weighting 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.png["Example: A completed weights information table",align="center"]
 
 ==== Saving the updated dive information
 
-The information entered in the *Dive Notes* tab, the *Equipment* tab can be saved with all the other information of your dives in your logbook by using the two buttons on the bottom right hand of the Dive Notes tab. If one clicks Save, the dive data are saved. If one clicks Cancel, the newly entered dive data are deleted, although the dive profile obtained from the dive computer will be retained. When one exits _subsurface_ there is a final prompt to confirm that the new data should be saved.
+The information entered in the *Dive Notes* tab, the *Equipment* tab can be saved with all the other information of your dives in your logbook by using the two buttons on the top right hand of the *Dive Notes* tab. If one clicks _Save_, the dive data are saved. If one clicks _Cancel_, the newly entered dive data are deleted, although the dive profile obtained from the dive computer will be retained. When one 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
 
@@ -327,7 +348,7 @@ DiveManager. Native format of JDiveLog and MacDive are imported as well.
 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 substantially different) _subsurface_
+beginning time of the dives to be almost simmultaneous) _subsurface_
 will not create duplicate entries.
 
 [[S_ImportingDivesSuunto]]
@@ -599,7 +620,7 @@ The graph can also include the dive computer reported *ceiling* (or more precise
 
 For a more detailed explanation of _gradient factors_, use the following links:
 
-- 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.tek-dive.com/portal/upload/M-Values.pdf[Understanding M-values, by Erik Baker, 1988, _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]
 
@@ -846,7 +867,7 @@ Note the _Apply_ button now active, click on it and, luckily, you'll be done.  S
 _Features, issues and tips._  Automatically applying of GPS data to the dives is a task very dependent on a correct time.  Note that there might be a difference between time in your DC and time in your android device, if you have a little one there'll be no problem and the logic will work fine, but if it's big Subsurface will be unable to identify the dive which matches the coordinates, and nothing will happen. The ideal is have a correct time in your DC (or in the android device, whichever is wrong)  but this may be not possible.  A dirty hack is editing manually the time in Subsurface's log _before_ downloading the GPS data. If the correct time was the erased one, then simply edit it back manually again _after_ downloading.
 
 
-== APPENDIX A: Operating system specific information for importing dive information from dive computer.
+== APPENDIX A: Operating system specific information for importing dive information from a dive computer.
 
 === Make sure that your OS has the required drivers installed
 [icon="images/icons/drivers.jpg"]