| Re: So it really is kinda like OC's progression.....
Well the obvious difference is that the potential maximum buoyancy shift is far smaller than on OC, since there's no huge volume of gas that "disappears" during use.
On the other hand you have to account for the potential consumpton of your bail gas (and weight for it), which results (on a rec rig where "loss of personnel" is not acceptable) in a significant shift.
Absent that and no exposure suit shift (e.g. a drysuit being dove constant-volume, or a rash guard which doesn't compress) you could dive with the rig balanced and no BC without any problem at all. However, most of my diving is done with a wetsuit, so there is a shift - its just not anywhere near what it was with an OC rig.
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