forum.heinrichsweikamp.com

Hi.

I just took a look at some CNS calculations in different software.

A 68m dive i did last week got a final CNS of 49% according to the OSTC3 log data, and (the now fixed) CNS calculations done in subsurface produced a result of 63%.

If i punch in about the same dive in the OSTC3 dive planner it says CNS: 0% -> 5% , which is complete bogus. Btw. The deco profile that the planner emits looks sane.

I'm no pic asm guy but as far as i see it the ostc3 code calls the same cns calc code as done in "real" dive mode. so its somewhere in the planner something is broken.

Can you post the dive plan you're simulating, please?

Bottom time, max. Depth and Gas/Setpoint setup.

Regards,
Matthias

21min 63m
18/45, 50%, 100%

Ostc deco planner says CNS: 0%->5%
(Firmware 1.30)

GUE decoplanner says: 54%

Subsurface calculates: 46%

I can't say if the real answer is 54%, 46% or something else, but 5% is most definitely bogus.

OSTC3's answer is 48% -> With the new 1.40 we have just uploaded. There was indeed a bug with the CNS in the deco planner (Not in real dives).

Thanks for reporting.

regards,
Matthias