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I thought I knew all the basics of recreational Nitrox diving - in spite of my instructor. Pretty sure I knew more than him by the time I got my card.
I know how to plan a dive using Padi 32% or 36% charts, how to calculate Soft Bottom & Hard Bottom depths for any recreational O2 percentage. When I can get a custom blend, I prefer 30% EANx for most of the North Carolina & Florida Keys wrecks I've done, 28% for the Bibb and a few of the NC's.
But let's say I'm doing 2 morning dives, to about 60-80 feet? My initial analysis is based on a 70 foot average:
On a recent Cozumel trip, some divers said if doing 1 of 2 similar dives on Nitrox, do it on the second...?
Looks like they were right, in that I'll have 2 more minutes in plan #2 in this example, but finish in 1 dive group lower.
Did I approach this correctly, do it correctly, and end up with correct analysis...?
thanks, don
I know how to plan a dive using Padi 32% or 36% charts, how to calculate Soft Bottom & Hard Bottom depths for any recreational O2 percentage. When I can get a custom blend, I prefer 30% EANx for most of the North Carolina & Florida Keys wrecks I've done, 28% for the Bibb and a few of the NC's.
But let's say I'm doing 2 morning dives, to about 60-80 feet? My initial analysis is based on a 70 foot average:
- a: 2 Air dives: First to 35 min = Q, 81 min SI = C, only 28 min left for second = T, after 63 min at 70 feet;
- b: 2 Nitrox 32% dives: First to 36 min = M, 86 min SI = B, 35 min = Q, after 71 min at 70 feet - however - as much as they charge for Nitrox, do I really want to do both?
- c: Or one of each - and which one should be the Nitrox...?
On a recent Cozumel trip, some divers said if doing 1 of 2 similar dives on Nitrox, do it on the second...?
- 1: First on Nitrox to 36 min = M, 86 min SI = B, then Air on the second to 31 min = T, after 67 min at 70 feet; or
- 2: First on Air to 35 min = Q, 81 min SI = C, then 32% Nitrox on the second to 37 min = S, after 72 min at 70 feet
Looks like they were right, in that I'll have 2 more minutes in plan #2 in this example, but finish in 1 dive group lower.
Did I approach this correctly, do it correctly, and end up with correct analysis...?
thanks, don