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Hi Matthias,

Thanks for your answer.

So if I understand well, the confusion comes from my misunderstanding of the gas naming. Correct naming and use is:
- FIRST: the gas on which we start the dive, not included in the calculation of the predictive TTS
- TRAVEL: any gas that could be used during ...

Thanks Claude.

I understand from the manual that Travels are not included in the calculation of the deco. I also understand that HW consider that the dive always starts on the botton gas for a matter of safety.

For my oan use, I mostly do cave diving, and mostly never use the bottom gas first. In ...

Hello,

I've just received and try my new OSTC with the new firmware, but I have some trouble to correctly configure the gas for an OC dive.

I make a 3 gas dive: bottom is a 15/60, travel is a NX36, and deco is pure Oxy. Obviously, I start the dive on the NX36.

In my previous 2C, it was very easy ...