In regards to Nitrox training: There are many agency that will certify a person to dive with Nitrox. TDI requires only classroom training for certification. PADI requires classroom and 4 open water dives. GUE requires are even more stringent. My question is: Why are these guidelines different and which would be the best course to follow? -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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