Just to throw my unsolicited two cents in: The only discussion I seemed to notice that suggested OW dives should be required for Nitrox certification (and we are talking "recreational type") was a discussion of poor buoyancy control in a diver. I would suggest someone in this poor skill shape shouldn't receive OW certification in the first place. Now we have seen plenty of these yo-yo divers out there. I am pretty demanding of students for buoyancy skills before going to open water, let alone certification. I guess when you add up varying instructor's personal standards and some recommended PO2 limits approaching 1.6, you could certainly be in trouble. I DEFINITELY agree analyzing of several tanks should be required. I also would support teaching Nitrox as part of the open water course. Obviously, bottom times don't need to be extended to realize benefits from Nitrox. I think it is all in the way you teach it! David E. Smith -- Send mail for the `techdiver' mailing list to `firstname.lastname@example.org'. Send subscribe/unsubscribe requests to `email@example.com'.
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