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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.

My basic course, 20 years ago, did not really mention partial pressure in
detail, but it did cover N2 and O2 effects.  They were VERY careful to tell
us about oxygen toxicity; they were VERY careful to tell us about nitrogen
narcosis; they were VERY careful to make certain we really and truly
understood the U.S. Navy Standard Air Tables.

This was the old Scubapro Skin and SCUBA System 100 videotape series.  It
was outstanding, far better than the PADI tape I saw ten years later.  I
wonder if Scubapro has given any thought to updating that series.

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