diff --git a/Documentation/user-manual.html.git b/Documentation/user-manual.html.git index 2e0c1d0fa..bae97b6af 100644 --- a/Documentation/user-manual.html.git +++ b/Documentation/user-manual.html.git @@ -722,6 +722,8 @@ 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 @@ -1002,7 +1004,7 @@ the divecomputer allows this, 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 +even though some may already be in the logbook, then check the check box labeled Force download of all dives.
Cylinders: The cylinder information is entered through a dialogue that looks +
Cylinders: The cylinder information is entered through a dialogue that looks like this:
Subsurface easily handles dives involving more than one cylinder. Sidemount dive logging involves -three steps:
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:
-During the dive, recording cylinder switch events. Since sidemount diving normally involves two +Describe the cylinders used during the dive This is performed in the Equipment tab of + the Dive Info panel, as 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 toolbar 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.
+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 @@ -2406,7 +2454,7 @@ three steps:
-This section gives an example of the versatility of Subsurface as a give logging tool.
This section gives an example of the versatility of Subsurface as a dive logging tool.
+
+ |
+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 Dive 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 multicylinder dives. +
+If a pSCR Dive Mode has been selected, the dive ceiling for pSCR dives is adjusted for the oxygen +drop across 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.
+-Unit system: only one unit system shold be used (i.e., no mixture between imperial and metric units) +Unit system: only one unit system should be used (i.e., no mixture between imperial and metric units)