Subsurface planner

[Rick Walsh]

On 16 Oct. 2017 7:11 pm, "Stefan Fuchs" <sfuchs at gmx.de> wrote:

Good morning!

Good evening,

Am 16.10.2017 um 09:20 schrieb Willem Ferguson:

Rick, your mail is truly useful. Thank you. Comments in-line below:


Attached screenshot is 4.6.4.977, downloaded yesterday(Sunday). When plan
variations is activated, it says "extend dive duration for 38 seconds for
each extra minute of dive duration". That sound totally counterintuitive
because the dive duration should increase with at least one minute for each
minute that the bottom time is increased??


The variation is the ratio of change in deco time (not total dive duration)
to change in bottom time. So the total dive duration would increase by 1:38
for a 1min increase in bottom time


On 16/10/2017 08:59, Rick Walsh wrote:

I can confirm Ricks summary. Lot's of small fixes were done for the planner
but the two items "Plan variations" and "Minimum gas delta" are the only
really visible items.




> The planning using VPM-B is still pretty broken. The ceiling generated is
> just totally wrong.


Can you please test the latest master / daily builds?  My commit f9d05a8 a
week ago should have corrected the *totally* wrong ceiling, but there may
be more bugs.  If it's still not right we need to fix that.


Attached screenshot is 4.6.4.977, downloaded yesterday(Sunday). The VPM
plan generates an impossible ceiling. Perhaps worth another look?

Yes, regarding the ceiling I agree that there were some huge improvements
but at the same moment there still seem to be more bugs.
The picture from Willem reminds me a little bit of the EAN32 picture I
produced. Now that Willem showed that he can also have strange ceiling
results with air I successfully duplicated this here. Attached are a few
examples which are similar to Willems results.

About the "EAN32" issue (which may not be only restricted to EAN32):
- Yes, at least the "deepest ceiling before end of bottom time" part of the
EAN32 issue is still there. And what we see here looks very similar to this.
- Also for this example setup the ceiling calculated inside and outside the
planner is different
- For the ceiling calculated outside the planner I also still have the
effect that ceiling for EAN31 is larger/deeper than for EAN30%

Sorry for the large pictures but I also wanted to provide the full setup...


Thanks Willem and Stefan for those examples of discrepancies in ceiling
calculation between the planner and profile. Hopefully we can resolve them.
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