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John, PADI's course documentation is excellent and the accompanying tables and video (probably soon available in UK) round out the concepts taught. Please note I am neither a PADI instructor nor do I have any proprietary interest. ANDI, TDI and I am sure other groups, all have student training materials. These are usually of the xerox repro type, mostly without photos and sometimes with poorly reproduced figures. Their tables for Basic Nitrox are just the Navy/NOAA tables. My impression, as an educator, is that a great deal of thought has gone into the PADI materials. I know that they are being slammed by some as too conservative, too dogmatic and too simplistic. I think all those criticisms have some merit, but I think you need to know the basics first and then can look elsewhere for dialectic. I dont't think you will go wrong with PADI's course materials as a starting point. The tables PADI supplies are good and recommend a upper limit pPO2 upper limit of 1.4 ATA. The US Navy/NOAA uses 1.6 ATA for maximal exposure. I am an advanced recreational diver, *not* an expendable marine/soldier. My own choice is to plan my dives to keep my pPO2 to < 1.3 ATA (true weenie that I am). There are several texts on Diving Medicine - Diving Physiology in Plain English, Bookspan (1995) US$30 from Undersea & Hyperbaric Medical Society, 10531 Metropolitan Ave, Kensington, MD 20895 USA Ph: 301/942-2980 Fx: 301/942-7804 is (in my opinion) a good one. If you want others, e-mail me. Safe diving and enjoy nitrox! Peter Heseltine
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