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Paragraph in manual about off-gassing

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The VPM-B model assumes off-gassing only happens during ascent
which for us are that part of the dive where dp->entered is
false. This is wrong for dives with manually entered waypoints
in the ascent, as discussed in

See #601.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
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Robert C. Helling 2017-09-28 23:21:30 +02:00 • committed by Lubomir I. Ivanov
parent 2a29d4a4ba
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Documentation/user-manual.txt
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@ -3568,6 +3568,17 @@ dive durations than the Bühlmann model, albeit at the cost of higher tissue com
When selecting one of these models, keep in mind they are NOT exact physiological models but
only mathematical models that appear to work in practice.
Please note as well that there is an intrinsic assumption of the VPM-B
model that off-gassing only happens during the ascent phase of the
dive (which is the part controlled by the planner). Thus it is
possible to get misleading results if you manually enter waypoints
well in the decompression phase of your dive. This is particularly
relevant when editing a dive read from disk in the planner since that
will have waypoints up to the surface. Thus for those dives, first
delete all waypoints during the ascent phase. This is most easily done by
holding the Ctrl- or Command-key while clicking on the trash can icon
next to the first ascent waypoint in the table on the left hand side.
For more information external to this manual see:
* link:http://www.tek-dive.com/portal/upload/M-Values.pdf[Understanding M-values by Erik Baker, _Immersed_ Vol. 3, No. 3.]