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>Most new divers take a PADI openwater course. In this course, divers are not
>taught the math involved nor the physiology of tissue gradients. This means
>that most new divers have no concept of the basic mathematical or
>physiological parameters that is the foundation for nitrox. There is no magic
>here either-it easy and straight forward. I could teach a good diver the
>information needed to dive nitrox safely in under an hour. 

>Nitrox is all academic. No new diving skills are required to dive nitrox
>providing the diver already knows how to dive and control his buoyancy.  If
>you can dive and breathe at the same time, you can dive nitrox. 

Agreed on all points. It's just that once you *do* cover the physiology 
and the partial pressure formulae you essentially just crank in your 
varying mixes and turn the handle, so to speak. The *principles* do not 
change, only their manifestations medically as the various ratios change.

It just seems that what should be somewhat straight forward is looking 
progressively more fragmented. I suppose this is what the basic 
certification programs looked like in the dim antiquity

Robb W  

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