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I'd appreciate some information on the following altitude diving issues.
(I'm aware of the issues regarding calculating equivalent depth for nitrogen
loading purposes; my questions relate to PO2 and PN2 limits.)  Thanks in
advance,

Andy

Is any "equivalent depth" calculation required for the purposes of limiting
Nitrogen narcosis at altitude? Which depth should be used to calculate the
PN2 for managing narcosis, the actual depth or sea-level equivalent depth?
For example, would a dive on air to 100 feet actual depth at an altitude of
5,000 feet cause the same degree of nitrogen narcosis as the same dive at
sea level (ignoring minor differences in pressure due to fresh water vs.
salt water)? 

Same question for O2 toxicity--is any adjustment required to manage one's
PO2 exposure?  For example, a dive to 100 feet at sea level using 36% Nitrox
would result in a PO2 of 1.45--would the same dive at an altitude of 5,000
feet produce the same risk of O2 toxicity?  


                                  ..        ..
Andy Gourevitch                   ||        ||    
Business Planning                 ||        ||      email: andyg@ci*.co*
Cisco Systems, Inc.              ||||      ||||     (408) 527-0817 (voice)
170 West Tasman Drive        ..:||||||:..:||||||:.. (408) 526-4734 (fax)
San Jose, CA 95134             Cisco Systems Inc.            


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