Markus, > On 30. Nov 2021, at 03:14, Markus Ehmann via subsurface > <subsurface@subsurface-divelog.org> wrote: > > One question I have is about the Buhlmann used for planning as well as > calculated TTS when analysing a divelog. The settings don't specify if this > is the ZHLC or ZHLB. > Can you tell me which one is used or if I may missed the option to switch to > either one? > Depending on the dive computer used, the differ during the dive and it would > be neat to align planning and profile as close as possible. > > As you can see in https://github.com/subsurface/subsurface/blob/1e527fb9f01388df2248a90efc7de26c90faec75/core/deco.c#L84 Subsurface uses the ZHLC coefficients as should be the case for dive computers (-B is to generate tables).
For the detailed coefficients, see for example http://www.nigelhewitt.co.uk/stuff/aab.jpg. The a coefficients in the -C model are about 10% smaller in the middle tissues and since tolerated = (tissue_inertgas_saturation - buehlmann_inertgas_a) * buehlmann_inertgas_b; this means that tolerated is bigger. That means that for given tissue saturation the ceiling is a higher ambient (tolerated) pressure i.e. deeper. So this version is a bit more conservative, but the difference is not too big. > Also, having recently added a Divesoft Liberty, I noticed that the import of > divelogs works only with the .dlf files. > With their recent 2021 hardware update, Divesoft added Bluetooth > functionality. So I wondered if you have any plans of adding a direct > Bluetooth import for this computer to subsurface as well? > I don’t know. As far as I know, none of the developers have such a computer. And implementing this would be helped substantially if there were information on how the protocol is supposed to work (most likely provided by the manufacturer). Best Robert
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