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>I would like to see the emphasis for using NTX changed from *you can >dive longer* to *you can dive safer*. In the area I am in (southern Yes, this is definitely the way it should be used by "recreational" divers, however... >California), the emphasis on selling NTX training courses is "dive >longer". Most of the people that get NTX trained don*t realize that >diving longer on NTX (just as close to the edge as they dive on air) >is NOT safer. It is these divers that already lack the discipline to >adhere to depth and time limits and they use NTX to go past the air >NDL (for fun, lack of discipline, etc) not realizing that they are >probably in MORE danger due to OXTOX, Low air (NTX) situations (want >to use all of the NTX that they paid for), and DCI from longer dives >(lack of discipline, planning). I've only had a very small amount of sleep (we're moving tomorrow), so please correct me if I'm wrong, but... The "standard" depth limits for nitrox are: 32% O2 - 130' PPO2 @ Max Depth = ~ 1.6 36% O2 - 100' PPO2 @ Max Depth = 1.45 For any reasonable dive, you will NOT hit the O2 Tox limits of Nitrox II if you are diving at <100', the real concern is diving too deep with Nitrox and to that I say - *personal responsibility*. The standard limits for O2 Tox are 45 min at 1.6 atm, so if you back off of the max depth limit of Nitrox I a little (to a PPO2 of 1.5 atm) you'd be well within the save ranges for O2 Tox limits and since "rec" nitrox is done without planned deco, the dive time limits should be hit long before O2 Tox is reached. >Recreational NTX is fine. I would just like to see the emphasis changed >(I do not expect that to happen anytime soon). Well, when done properly, bottom times can be extended safely, you just really need to look at the margin you're leaving yourself on the deco limit and the percentage tissue loading. If you're diving up to 90% tissue loading now and you switch to nitrox, extend your dive times, but limit yourself to 80% tissue loading, I would maintain that you have safely increased your bottom time (I realize that you said "diving within the same margin")... -Carl-
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