diff options
author | willem ferguson <willemferguson@zoology.up.ac.za> | 2015-02-05 20:42:21 +0200 |
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committer | Dirk Hohndel <dirk@hohndel.org> | 2015-02-05 11:27:35 -0800 |
commit | 7b44cf2a61f967da807d616aea76479020fb4392 (patch) | |
tree | 54014aa811f4a692a815fc84a4f4c84a83df17db /Documentation | |
parent | 802bf1d7c8e4c291c62034e0bf0888aa1d672e0f (diff) | |
download | subsurface-7b44cf2.tar.gz |
User manual: small updates
A section on multicylinder dives has been added.
Just to warm LongJohnSilver's heart, a short section on pSCR has been added.
Please feel free to add to the pSCR section, LongJohn.
Replaced the sidemount figure with obsolete mean depth line.
Fixes #827
Fixes #828
Signed-off-by: willem ferguson <willemferguson@zoology.up.ac.za>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/images/halcyon_RB80.jpg | bin | 0 -> 15149 bytes | |||
-rw-r--r-- | Documentation/images/multicylinder_dive.jpg | bin | 0 -> 44091 bytes | |||
-rw-r--r-- | Documentation/images/pSCR_profile.jpg | bin | 0 -> 43689 bytes | |||
-rw-r--r-- | Documentation/images/sidemount1.jpg | bin | 57860 -> 45928 bytes | |||
-rw-r--r-- | Documentation/user-manual.txt | 81 |
5 files changed, 75 insertions, 6 deletions
diff --git a/Documentation/images/halcyon_RB80.jpg b/Documentation/images/halcyon_RB80.jpg Binary files differnew file mode 100644 index 000000000..ba14826c3 --- /dev/null +++ b/Documentation/images/halcyon_RB80.jpg diff --git a/Documentation/images/multicylinder_dive.jpg b/Documentation/images/multicylinder_dive.jpg Binary files differnew file mode 100644 index 000000000..07d44c156 --- /dev/null +++ b/Documentation/images/multicylinder_dive.jpg diff --git a/Documentation/images/pSCR_profile.jpg b/Documentation/images/pSCR_profile.jpg Binary files differnew file mode 100644 index 000000000..1a00ee15a --- /dev/null +++ b/Documentation/images/pSCR_profile.jpg diff --git a/Documentation/images/sidemount1.jpg b/Documentation/images/sidemount1.jpg Binary files differindex ae919f616..96e797a5a 100644 --- a/Documentation/images/sidemount1.jpg +++ b/Documentation/images/sidemount1.jpg diff --git a/Documentation/user-manual.txt b/Documentation/user-manual.txt index 886c687d7..87368756f 100644 --- a/Documentation/user-manual.txt +++ b/Documentation/user-manual.txt @@ -824,6 +824,7 @@ _Subsurface_ and the information on cylinders and gases (entered here) determines the behaviour of the dive profile (top right-hand panel). +[[cylinder_definitions]] *Cylinders*: The cylinder information is entered through a dialogue that looks like this: @@ -1635,12 +1636,46 @@ If, later, the external drive with the photos is connected again, the photos can === Logging special types of dives +[[S_MulticylinderDives]] +==== Multicylinder dives + +_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: + +- *Describe the cylinders used during the dive* This is performed in the *Equipment tab* of + the *Dive Info* panel, as xref:cylinder_definitions[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 ttolbar 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. + +image::images/multicylinder_dive.jpg["FIGURE: Multicylinder profile",align="center"] + ==== Sidemount dives -_Subsurface_ easily handles dives involving more than one cylinder. Sidemount dive logging involves -three steps: +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, recording cylinder switch events*. Since sidemount diving normally involves two +- *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 @@ -1666,6 +1701,38 @@ image::images/sidemount1.jpg["FIGURE: Sidemount profile",align="center"] This section gives an example of the versatility of _Subsurface_ as a give logging tool. + +[[S_sSCR_dives]] +==== Semi-closed circuit rebreather (SCR) dives + +[icon="images/halcyon_RB80.jpg"] +[NOTE] +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 xref:S_MulticylinderDives[multicylinder dives]. + +If a pSCR _Dive Mode_ has been selected, the dive ceiling for pSCR dives is adjusted for the oxygen +drop accross 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. + +image::images/pSCR_profile.jpg["FIGURE: pSCR profile",align="center"] + + + [[S_CCR_dives]] ==== Closed circuit rebreather (CCR) dives @@ -1842,7 +1909,7 @@ different colours: The profile also includes depth readings for the peaks and troughs in the graph. Thus, users should see the depth of the deepest point and other peaks. Mean depth -is marked with a horizontal red line. +is plotted as a grey line, indicating mean dive depth up to a particular moment during the dive. [icon="images/icons/scale.jpg"] [NOTE] @@ -2698,8 +2765,10 @@ This panel allows two type of selections: ** _Show unused cylinders in Equipment Tab_: This checkbox allows display of information about unused cylinders when viewing the *Equipment Tab*. Conversely, if this box is not checked, and any cylinders entered using the *Equipment Tab* are not used (e.g. there was no gas switch to such a cylinder), then these cylinders are omitted from that list. -** _Show average depth_: Activating this checkbox causes _Subsurface_ to draw a red line across - the dive profile, indicating the mean depth of the dive. +** _Show average depth_: Activating this checkbox causes _Subsurface_ to draw a grey line across + the dive profile, indicating the mean depth of the dive up to a particular point in time during + that dive. Normally this is a u-shaped line indicating the deepest average depth just before the + ascent. * *Misc*: |