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Dave Story writes: > Or use a computer. Typically, I do at 15-25', depending on conditions > and the presence/absence of a downline. I make sure I don't rise > above 10-15', and just count my deco time at the average depth (15-20'). 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. Sounds to me (and please correct me if I'm wrong) that the profile you are describing is for very small deco where you have simply over-run the NDL a little (planned or otherwise) and you can compensate by rising more slowly on the computer until it gives you the all clear to rise further. 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. On Buhlmann tables you have a stop every 3m above 24m If we take a Buhlmann profile; say 45m for 40 mins. The deco on this is: Depth (m) 24 21 18 15 12 9 6 3 Time (min) 2 5 9 18 34 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. Alan -------------------------------------------- awright@gs*.bt*.co*.uk* (Alan Wright) BT, Software Engineering Centre, Glasgow, UK --------------------------------------------
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