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I think IANTD has taken the right direction with OW nitrox - i.e., 
including nitrox within entry-level certification courses.  Why?  Well, 
what's so special about nitrox training?  You need to learn what partial 
pressures are, and you need to have a rough idea of how different partial 
pressures of N2 and O2 in conjunction with ambient pressure tend to affect 
human physiology.  As far as I'm concerned, this is material that ALL 
scuba divers should know.  By including nitrox training within 
entry-level scuba courses, the courses now cover material that should have 
been covered in all basic scuba courses all along.

Aloha,
Rich

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