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On Wed, 7 Sep 1994, Jason Rogers wrote: > Hi David, > > We are already making our first stop at 39 or 42 metres. Do you mean deeper > than that? > If you intended deeper than that, then for how long? > Cheers Jason My experience causes me to agree with David here. We've found that the most critical aspect of avoiding DCI or "pre-DCI" problems after deep dives is SLOWWWW ascent rate, and that includes extra deep stops. If your first stop is in the neighborhoo of 40 m, then you're obviously talking about some pretty hard-core exposures (90 m? 100 m?). If my tables call for the first stop to be 40m, then I usually hang out at 60-70 m for about a minute, then 50 m for a minute, then proceed with the schedule. Also, my ascent rate between stops is very slow (10m/min or less). The problem, of course, is that the tables assume you are going to be ascending steadily to the first stop, and they don't account for the additional gas loading. One way around this is to plan a multi-level dive (if your software allows you to do this) to include the deeper stops. The other is to add a few extra minutes at your shallower stops. No, it's not an exact science - but this is what our own experience has led us to do. Pls don't sue me if it doesn't work .....;-) Aloha, Rich deepreef@bi*.bi*.ha*.or*
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