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I had a relatively early IAND Technical Nitrox course (my cert # is 74) but
was not told the "1 minute on O2 = 2 on air" rule.  Billy Deans, from
whom I took the course, tends to make safety a principle concern, and promotes
use of EAN/O2 for safety more than for extended bottom time or accelerated 
deco.  I did hear the rule from Randy Bohrer, who has been doing IANTD tables
for Tom Mount, co-authored the "Mixed Gas" book, did the algorithm for Dive
Rite's nitrox computer, and actually does some technical dives (he was a 
stage diver for Sheck Exley on his record deep Mante dives).

Would I use this rule?  Not unless my drysuit was flooding, or I was injured,
or running low on gas.  Then it might be good to know.

jheimann@sc*.gt*.co*

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