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Interesting thoughts. A few comments: 1. Double 80s are fun to dive. I have several sets, find them very comfortable. You only have 160cf of gas, not a lot more than a single HP 130. So, you can use them for a lot of tech / deco dives, but you may not be going real deep, or staying very long...

Ideally, a frameless mask should be so low volume that the difference in light between a clear and black skirt should be virtually unnoticeable. But, there is the matter of personal perception and preference and CamG makes a good point. Another advantage that some report with a black skirt is...

I suspect the point was the choice of a console-mounted vs wrist-mounted computer, and a suggestion you think through that particular issue before buying. There is nothing wrong with air integrated, nothing wrong with the Cobra, etc. The Cobra is nitrox-capable, has a readable screen, and Suunto...

This question has come up on SB before, about this particular operation in Charlotte. And, the reactions have been the same. The costs seem to be higher than other, entry-level OW instruction options, in Charlotte or elsewhere. However, noone who has been through this particular course has...

30s are used, perhaps not as frequently as 40s. I dive 30s as deco bottles when the required gas supply, with reserves, allows me to use the 30, instead of a 40 (or an 80). In the water, it is less likely you will notice a difference in a slung 19 vs a slung 30 or 40. If the dive planning is...

As texdiveguy said, clip to the same chest / hip rings. The goal is to have the richer mixture inboard - clip it first. Then clip the second bottle (the leaner mixture, which you will use first, outboard of that bottle. Some describe that configuration as having the leaner mixture 'on top' of...

The DSAT sequence emphasizes equipment configuration and procedures on the front end, and diver exposure to greater depth, and actual decompression diving and richer (than 50%) O2 blends, comes late in the sequence, compared to some other agency offerings. This is not a matter of ‘good’ or...

Good advice. I read the manual ahead of time, twice. I did the knowledge reviews before class. I felt prepared in the class, and it was fun. No. It was more a seminar than a classroom. The PADI approach is to make the process enjoyable. Most PADI instructors I know are serious about making...

Yes. Factor in descent time, and ascent time air consumption as well. Add the descent time to your bottom time, at your bottom air consumption rate, for simplicity. Set it up as a spreadsheet, with coulmns for Depth, Time, Total time, SACR, Converison factor (e.g. the 4.22 for 106 ft)...

You didn’t ask if it is a good idea. You asked how to do it. We all need to push our personal limits at times. I’ll give you my thoughts, based on what I know now. Yes, having the formal training is good. But, you can go to 50m without it, if you are reasonably prudent. (And, more than a few...

Nothing wrong with the TransPac, the Rec wing, or the weight pockets. Have dove all of them. Having used simple SS or AL BP, a Transplate rig, and a TransPac, I prefer the BP as I don't need the shoulder padding in the TransPlate rig. I simply do not care for the TransPac - too much 'stuff'...

Very true. The new diver can function as well with a rental jacket BC as with an expensive purchased back-inflate BC, because the newer diver should be focused on the (continued) development of bouyancy and trim control, proper finning techniques, etc., etc., etc. One of the challenges is newer...

I am not aware of documented incidents involving diver injury resulting from this situation. I previously cited mine / ours. In fairness to the 'quoters', and those who went astray: The OP conveyed no indication that it was a 'Devils Advocate' post. You cited what was apparently a recent...

Good question. Thermo does not appear to make a Pro valve for a 7/8 neck tank.

And, you carry all of this in your luggage on airplanes when traveling to the Caribbean?

Well, if you used the tanks for nitrox, there should be a decal or sticker affixed to the tank, indicating the contents. If nitrox was put in, and no sticker was put on, that is inappropriate, and a safety concern. And, while it is tempting to take these off after a dive (after all, WE know what...

If your point is that a diver may begin to experience SOME degree of nitrogen narcosis as soon as he/she submerges, and the degree of narcosis increases at some variable rate as depth increases, and that narcosis at any depth may be imperceptible and clinically insignificant but is still...

Battle, you shouldn't waste your time trying to teach a pig to sing. It can't be done, and it just frustrates the pig. Or, put another way, as Larry the Cable Guy (or one of those redneck comedians) says, 'You can't fix stupid'.

Data from objective, published studies suggest there is no psychomotor or behavioral adaptation, in terms of measurable test or task performance, resulting from repeated exposure to depth. They also indicate that subjective adaptation does occur. A potential danger of this dissociation, of...

Clarify the question. On one hand, it sounds like the problem is that you feel you have too much weight. So, people are responding by talking about how to do a proper doubles weight check, suggesting that you stay a little more negative than you might ordinarily do, etc. Reasonable responses...