For completeness also here:
(sorry for the bottom post).
--jan
On 19-03-17 11:26, Stefan Fuchs wrote:
Hello Jan,
Am 19.03.2017 um 09:53 schrieb janmulder:
Ok, I never use the Subsurface planner IRL so I might be confused how
thing are supposed to work. So when working on a translation of the
user manual (to Dutch), I sometimes find functionality that I just
try on the current master.
Intrigued by a sentence in the user manual "/Subsurface/ will
automatically extend the bottom section of the dive to the maximum
duration within the no-decompression limits (NDL)." from the
Recreational dive planner section, I try to plan a recreational dive
following the procedure in the user manual. I expect to end up with a
dive with at least reserve pressure, with a maximum bottom time
without any deco obligation.
It is unclear to me how to trigger the "automatically extend the
bottom section". It lets me drag the waypoints, sometimes I see a
minor snap to a different value, but, in general, this does not lead
to a bottom phase on NDL. Tried to drag points, alter the table, but
to no avail.
Seems a bug to me.
I was in a similar situation a few days ago when I had to decide how
to implement and document the minimum gas calculation for the planner:
I also had to learn how the recreational mode really works - I never
used it before.
But my result was that after the idea became clear to me and I double
checked a few results by e.g. calculating gas consumption I felt very
happy with the results and started to like the implementation. So no
bug found on my side.
One hint: As soon as you use such tiny small cylinders like 10l <g>
most probably gas consumption and reserve gas will be the limiting factor.
BTW: I copied this to the mailing list.
Best regards
Stefan
--
Stefan Fuchs
E-Mail: [email protected] <mailto:[email protected]>
Ok, ok. Like I said, never user de planner IRL (and certainly not in
Recreational mode).
As Stefan pointed out on the mailing list ... it takes a little training
to get familiar with use the planner, and indeed, I know do not see the
issue I pointed out here any more.
I understand where I was thinking the wrong way. I had set slow ascent
speeds, and did not really notice the change of scale of the entire
window when changing data of the profile. What is still counter
intuitive for me, is that it is called recreational dive mode, but
taking into account slow ascend speed (3m/min from 50% up, 1m/min from
6m) you still can achieve TTS values of 20 minutes (for a dive to 30m).
The counter intuitive part for me is, that I am not aware of any
recreational dive courses that take into account different ascend speeds
depending of depth. Obviously, this is something very well known in the
technical diving scene. And TTS of 20 minutes can hardly be considered
recreational.
Issue closed.
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