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Alan Wright > > Most computers I've seen don't allow this latitude. If you rise above > the stop they go into error and you have to drop down, or wait for the > trough to pass. I'd like to know if the computer is compensating for > the amount of time spent shallow. 15-25' also seems quite deep for the > final stop in a deco profile. As Bill Mayne points out, I am talking about taking the final 10' stop deeper than 10' to avoid troughs "raising" me above 10'. When you are using a computer, there is nothing wrong with hanging deeper than the required stop. In fact, it is one of the best things about deco on a computer: since hanging deeper reduces the pressure gradient, you are less likely to bubble. With tables, you cannot hang much below the indicated depth because (most) tables do not take the slowed offgassing into account. > Sounds to me (and please correct me if I'm wrong) that the profile you > are describing is for very small deco [....] Doesn't matter what the deco is, though I rarely go over 30 minutes: it's too cold, even dry. That and the conditions change rapidly. > You will probably be using only your mounted tanks so that your ascent > rate is controlled only by the computer asking you to wait. > > On a dive plan where you have to rise to staged bottles you don't have > this luxury. I'm not sure how and why my gas source relates to my ascent rate. If I have deco stops, I have deco stops. I also have a fixed, not-to-exceed ascent rate. Why does my gas source matter? > This means that you will have been bobbing up and down at 3m for over > half-an-hour possibly by up to 2m in rough seas. I wouldn't trust the > repetitive group or the allowable BT for subsequent dives from a > computer. Actually, the dive would have to be damned important before > considering doing it in these conditions in the first place. Yes, doing a dive like this requires foresight and planning, as well as fortitude, but what does this have to do with how to perform a 3m hang? Cheers, Dave Story NAUI AI Z9588, PADI DM 43922, EMT story@be*.wp*.sg*.co* Better diving through drugs.
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