Hi I have just realized that Subsurface appears to be miscalculating gas consumption and SAC. Gas consumption and SAC should be: consumption = tank size x (start pressure - end pressure) SAC = consumption / (time x (1 + ave depth / 10))
For a recent dive, Subsurface reported gas consumption as 1367 l, and SAC as both 18.8 l/min (in dive info) and 19.0 l/min (in dive list), yet I calculate consumption to be 1464 l and SAC to be 20.1 l/min. Tank vol = 12.2 l (single tank entered manually in equipment) Start 220 bar, End 100 bar (entered manually) Ave depth = 12.8m (downloaded from DC) Dive time = 32min (downloaded from DC) gas consumption = 12.2 x (220 - 100) = 1464 l SAC = 1464 / (32 x (1 + 12.2/10) = 20.1 l/min Similar miscalculations are being made for all of my last half dozen dives (I haven't checked the rest). Has anyone else noticed this? I like Subsurface enough, I don't need to be flattered by it telling me my gas consumption is better than it actually is. I'm using Subsurface 4.0.2 on Linux mint. Binary package version 4.0.2-0exp1ppa1~raring from http://ppa.launchpad.net/miika-turkia/subsurface-git/ubuntu/ I'm not a programmer, but happy to help if I can. Cheers, Rick _______________________________________________ subsurface mailing list [email protected] http://lists.hohndel.org/cgi-bin/mailman/listinfo/subsurface
