ItsBruce
Contributor
However, the rest of your post was atrociously dangerous. What you're suggesting is that you want an instructor to teach you how to break the limits of your cert without the proper training to do so. Purposefully breaching NDLs in purely rec gear without any of the other requisite skills. Do you think that all of the fancy crap tech divers learn to do is for show? I'm really not trying to be a butthead about it, I'm honestly asking. Besides the non-silting techniques, everything else is about useful skills even on normal Rec dives or "Lite deco." As has been mentioned above, proper redundancy isn't just about YOUR gas, but the gas of your buddy. Gas planning is about knowing for sure where you'll be in terms of gas reserves if all goes well, and what to do if it doesn't. All of the additional stuff you'd learn in a Tec40 class is so you can do dives that put you into deco with the training and knowledge to do those dives safely. That's what the card says, that the instructor believes you can accomplish those dives.
I'm mostly in agreement. But, I take exception about gas planning as it relates to deco obligations. Consider the following dive plan:
A diver is diving air. The first dive is 60 fsw for 45 min followed by a SI of 60 min. The second dive is 50 fsw for 40 min followed by another SI of 60 min. The third dive is another 50 feet but for only 20 minutes.
Does anyone disagree about these being easy, conservative dives? Does anyone think there are worries about gas, especially on the third dive?
Guess what? The Navy tables say "Deco" on the third dive!
Deco may entail gas issues, but not always.