On 08 May, 2017 - Robert Helling wrote: > Davide, > > > On 8. May 2017, at 17:15, Davide DB <[email protected]> wrote: > > > > I've logged the first few CCR dives with a Shearwater Petrel and a SF2 unit. > > I discovered that most fields get filled by data coming form the > > Petrel and some doubt arose on how to correctly log these dives. > > Basically I find the equipment tab filled with my default cylinder (3 > > liter) and the CC gas set on my Petrel. i.e 3L 18/45 and a column > > called "use" with the value "OC Gas". > > I can only change it with "no use". What does it mean? > > I would expect "CC use". It's my diluent. Of course in my Petrel I > > have the same mix set as bailout gas but I guess it isn't. > > Moreover for each dive I have to add another cylinder to record my > > Oxygen tank setting initial and final pressure. > > Once I go in the stats tab I find gas calculation only for the 18/45 > > mix, no trace for the oxygen consumption. > > Why I do not find any data for the Oxygen? Would it be very useful add > > these tanks by default. I don't know CCR units without a Oxygen tank > > and actually Oxygen consumption is the most important parameter. Isn't > > it? > > If I understand correctly the logic behind I guess I should add my > > bailout tanks marking them as "no use". > > > > If someone is already using Subsurface proficiently with CCR logs > > could you give me some hints? > > > as was recently discussed on github “OC gas” is a misnomer, the text should > be changed to “gas used”. > > To be honest, Subsurface currently does not really do any reasonable gas > calculations for CCR dives. As always, it only considers gas used if it is > ever switched to and has the implicit assumption that at any moment in time, > the diver is only breathing a single gas. Both is of course wrong for CCR > dives. Apart from displaying the initial and final pressures of the cylinders > anything more advanced is really hard to do (like interpolating pressures for > example). For oxygen in CCR dives, I would only make a linear in time > interpolation (independent of depth) while predicting diluent use as a > function of the depth profile is really hard to do right. >
We actually do handle the diluent and o2 consumption simultaneously, via the MkVI import. I don't know if you can "activate" that functionality manually. You can all see it in action when importing the test data "dives/Poseidon_MkVILog.txt". //Anton -- Anton Lundin +46702-161604 _______________________________________________ subsurface mailing list [email protected] http://lists.subsurface-divelog.org/cgi-bin/mailman/listinfo/subsurface
