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>"Oxygen & the Diver" talks about nausia & vomiting being a possiblity on >>switching to 100% oxygen. Nausea is a symptom of O2 toxicity. This is highly unlikely to occur in a resting diver at a PO2 of 1.6 ata (6m/20ft). I've never known or heard it to happen. The main advantage of using nitrox (say EANX 80) instead of 100% O2 is in slowing down the CNS oxygen clock whilst not increasing the decompression time by much. The disadvantage is that from a decompression point of view nitrogen outgassing is less efficient. I'd think it unlikely you'd get anywhere near exceeding the NOAA oxygen limits diving in the 50-60m range unless you were planning very long bottom times. For a 60m dive for 40 minutes, using a Buhlmann table, you'd be looking at about 90 min of decompression, just under half of it on 100% oxygen, which would put you at about 85% of the NOAA single exposure limits. I'd go for 100% oxygen. Logistically it's easier, and EANx 80 is just as dangerous as oxygen if you don't know what you're doing. >Do I buy a seperate 3 litre cylinder for every dive I plan to make ? What about a 7 or 10 litre stage bottle? These are my views. EANx 50 (etc) has its proponents, and I dare say one of them will be along soon. Regards, Andy. Dr Andrew Pitkin apitkin@ad*.de*.co*.uk* apitkin@ci*.co*.co*.uk*
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