dive planner lost gas and ++ profile

[Alon Dotan]

Hey,
two questions regarding the diva planner:
1. is it possible to simulate lost gas?
for example Im using both 50% and 100% oxygen deco gas but the 50% is also the travel gas, I want to check if I have enough 100% to complete the deco if the 50% lost after the travel
2.  can a ++ profile be auto generated based on the entered profile?
Thanks,

[Michael Keller]

Hi Alan.

On Mon, 10 Aug 2026 at 07:19, Alon Dotan <alon1...@gmail.com> wrote:

two questions regarding the diva planner:
1. is it possible to simulate lost gas?

Yes - just set the gas to 'not used' in the gas list.

 

2.  can a ++ profile be auto generated based on the entered profile?

Not sure what you mean by this, but Subsurface supports the calculation of plan variations:

 

Ngā mihi

  Michael Keller

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GCS$/CC/E/IT d- s+ a C++ UL+++/S++ P L++ E-
W++ N o? K? w O(++) M-- V+ PS+ PE+ Y? PGP+ t
5? X R tv b++ DI++ D++ G e+++ h---- r+++ y+++

[Alon Dotan]

Thanks Michael,
If Ill set the gas to not used, he will ignore it also in the travel phase,
regarding the ++ is a backup plan of what will happen if Ill exceed the bottom time by 5 minutes, or If Ill exceed the bottom depth by 5 meters

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[Robert C. Helling]

Hi,

Alon Dotan schrieb am Montag, 10. August 2026 um 10:15:14 UTC+2:

Thanks Michael,
If Ill set the gas to not used, he will ignore it also in the travel phase,

Indeed, this is currently not implemented. Might be not too difficult, though.

 

regarding the ++ is a backup plan of what will happen if Ill exceed the bottom time by 5 minutes, or If Ill exceed the bottom depth by 5 meters

As Michael said: This is to be deduced from the "plan variations": Those give you the additional run time per further minute at depth/additional meter of depth. Take those numbers, multiply them by five and distribute those over the stops (roughly in proportion to the length of the stops) and you should be in the right ballpark.

Best

Robert 

[Alon Dotan]

Thanks Robert,
I created this pr https://github.com/subsurface/subsurface/pull/4897 if you can TAL it will be very helpful,
Thanks

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