Re: TTS Calculation
Date: May 19, 2019 06:43PM
Arno is completely right!
The OSTC adds 1 minute per meter for the final ascent to the TTS, so with a last stop set to 3 meters it's 3 minutes, with last stop at 6 meters it will be 6 minutes (indeed!). When the last stop is finished, the TTS will disappear and "NDL 240" or alike will be shown, so these extra minutes won't acctually counted down on you any more when doing the final ascent. But for your own favour, you should still try to do it that slow - the "real" last stop is the surface, watch how the saturation percentage value goes up on the last meters!
The "xx left" in the deco calculator is an estimate of the remaining NDL time. The deco calculator is geared to calculate a deco schedule, if it doesn't find any stops that need to be done, it gives an estimate on how many more minutes would be possible. "0 left" hence means you're on the edge between NDL and deco.
Regarding deco plans from different computers: Suunto doesn't do Bühlmann, they use the secret RGBM algorithm. Other brands that claim to do Bühlmann generally do it, but often add lots of company-own "safety additions". There are only few computers that really do "straigth Bühlmann", the OSTC is one of them. When you are into serious deco diving, make a good decision which computer will be your companion...