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You know, after being a regular on SB for a number of years we seem to always have to define SAC. I wish we and the diving industry would change the acronyms to SACP for surface air consumption pressure and SACV for surface air consumption volume. RMV is not intuitive.

The m_value stands for maximum pressure. It should be understood as the maximum pressure difference between either itself and the surface pressure or between itself and ambient pressure. Since we need to keep the off gassing rate below a safe value it makes more sense to take the pressure...

I would like to offer some information that may help our understanding of GF99 and SurGF. This may be old information to those of you who have been using GF's. Here are the two equations used to calculate GF99 and SurGF (they may not be exactly the equations Shearwater uses but they serve here...

The Buhlmann ZHL-16C model uses 16 tissue compartments labeled 1 through 16; the fastest being 1 and the slowest 16. While the faster compartments on gas fast they also off gas fast. Compartments 1 and 2 generally clear on ascent. The slower compartments on and off gas the slowest. This suggests...

Multiple tissue compartments can offgass simultaneously. The controlling tissue compartment doesn't mean it is the only compartment to offgass but that it's calculated ceiling (yes, NDL dives have a ceiling) is the deepest or has the most positive ceiling. When I look at my spreadsheet that...

For me the solo cert gave me options. If I can't find a buddy I can still go diving. Solo is more relaxing in that I don't have to constantly look after a buddy. It gives me freedom in that I can do and go where I want when I want.

I updated the spreadsheet to include an automatic calculation of the air surface interval needed to get the controlling tissue compartment's current and surface gradient factor to 0. This might save some time for those of you who need to calculate this. This can be set for any profile when the...

Except for "managing their gas" recreational divers have been doing decompression stops for years. They just don't realize it. They're called safety stops. Physiologically, there's no difference between a mandatory deco stop and a voluntary safety stop. They both off gas the critical tissue(s)...

At the time I took PADI reliant (Sep 2013) using a twinset was acceptable. My regular buddy used one while I rented a 19 ft3 pony tank.

When I did my solo diving course (PADI self-reliant) I had to do gas planning and demonstrate it to the instructor. I was always a little bewildered by the necessity of this particular skill. Why is it so important to know as a solo diver and not for a (recreational) buddy pair? It could be that...

Yeah, you need to take a break. You contradicted yourself in the above quote! You first say there are no fundamental differences in the nature of dives. In the very next comment you say there is a fundamental difference in the nature of dives, and those differences are taken care of by the...

I tried to present some information that shows how both deco and NDL dives can be treated the same and in another way differently, but you reacted to it by insulting me. Without noise my answer to those five questions you posted above are: no, no, no, yes, and yes.

NDL and deco dives are fundamentally different because one type of dive demands mandatory stops and the other type doesn't. Our behavior is fundamentally different because those dives being fundamentally different demand that our behavior is different assuming we want to be safe from DCS. Edit...

Riding the NDL on the ascent is impossible unless you have multiple tanks staged at various shallow depths on the way up and you have a ton of patience. This is because the NDL time is not linear on the ascent. I've had a few minutes left of NDL only to go shallow and find my NDL is 23 min and...

....and let's not forget fiddling with the horizontal and vertical rheostats in the back of the TV to get that better picture. However, we had to wait at least 5 minutes for the TV to warm up before doing that.

It makes sense in that older people, generally, have more time (especially if they're retired) and money. I am 69 and was certified by NASDS in 1974. Dove as a vacation diver with about 25 dives over 5 years. Quit diving and had a family. Recertified in 2011 as an OW diver. I have 330 dives...

Curiously, nothing about exposure protection and nothing on weight. So, not detailed enough for me. Unless those details are in your write up which I had a hard time reading.

Your comment that agencies could care less about turning out qualified divers needs itself to be qualified. @stuartv, long ago in another thread, mentioned that the recreational agencies certify divers according to knowledge and not by proficiency in skills, provided those skills are basic...

Yes. The above bolded text otherwise known as the opposite of a restriction is something most novice and even experienced divers ignore. The longer the swim through the more dangerous a restriction is. There are some swim throughs of 10+ feet at Devils Den I will not go through with the group...