On Mon, Oct 27, 2014 at 11:29:47AM -0400, William Perry wrote: > >> > >> I just finished by CCR training down in Bonaire last week so I don’t have > >> a > >> lot of experience, but I did find that minor depth changes did not impact > >> the loop volume enough for me to feel the need to add diluent. My inhale > >> was cut very slightly short (I was diving with the auto-diluent-valve off > >> after the initial big descent). This would be equivalent to the occasional > >> mask clear at depth. If you are doing a ton of 10 meter ascents/descents > >> in > >> a cave system as it winds around then those will add up quickly, but 1-2 > >> footers is noise. > > > > I agree: 1/2 foot is noise, 10 m is significant. > > > > What value do you think we should use as limit? I just proposed 1 m on > > my previous email to Robert but I'm not sure if this value is big > > enough. > > > > What do you think? > > Maybe start tracking it if they stay at the new depth for more than a > certain # of samples? If I just drop down quickly to look at something > I’m not going to mind a short breath or two but if I am following the > contour of the reef and stay at that depth for 5-10 minutes I will > probably squirt in some diluent. I’m generally not a fan of heuristics > like that though.
With the benefit of absolutely know subject matter expertize, I think what would make sense is to smooth out the depth graph. Something like a gliding average across one minute - that should remove jitter and the quick pop down to look at things that you describe, at the same time it should be reasonably close to what I would call the "perceived depth" during a dive - and I think that's what people will tend to base their change to the counter lung content on... Again, just running my mouth (errr, fingers) and making things up here :-) /D _______________________________________________ subsurface mailing list [email protected] http://lists.subsurface-divelog.org/cgi-bin/mailman/listinfo/subsurface
