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Bill Mayne writes: > I'm confused by this response. ... > I don't know of any computers which don't allow stops to be performed > deeper than indicated, although they penalize you for doing this in > accordance with conventional theory. If you spend more than a short time > above the indicated stop depth the computer is likely to go into error > mode. Aladins simply suspend desaturation calculations while too shallow. > Although there may be valid concerns about bubble formation messing up > the model it is clear from a theoretical point of view that for the > short time the computer lets you spend too shallow before going into > error mode you would be offgassing. Hence suspending calculations is > ... Sorry for any confusion but I think we are saying the same thing. > > On a dive plan where you have to rise to staged bottles you don't have > > this luxury... > But on a dive where you have to rise to staged bottles you are most > likely doing a gas switch. Otherwise it would be okay to just keep > breathing from your main tanks, since deep stops are short and you > should have enough reserve gas to do it. If employing gas switches > which are critical (because you are shortening deco time compared to > staying on air) you wouldn't be using a computer to control the > decompression at all. Two things here (and I am open to different experiences from UK divers). First, nitrox is very new in the UK, as far as sport diving goes, and there are very few places to obtain it. Only one in Scotland and the shop has yet to run its first training course. So the only way to get it is to mix your own and no-one I know has done that. Everyone I know uses Air. Second, the rule here is that you don't use your own tanks to do deco even if you have enough air. In reality you would probably use them up to 6m. I think this is one of the reasons that SSAC is about to endorse the use of nitrox for sport diving. Alan
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