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Given that pressures are in fsw, msw, ffw, or mfw how can we convert those pressures to psi (imperial), bar (metric), or atm (atmospheres). It's actually quite simple. Recall that a pressure in fsw (feet of sea water) is actually the depth and the pressures are absolute. So, 49 fsw becomes 49...

The first thing to do is calculate the surface pressure. Workman used gauge pressure in his formulas since the US Navy used the surface as the starting point. The surface was sea level which was set to 0. Since Buhlmann was interested in diving in high mountain lakes he used absolute pressures...

Here is the text from the comment header of the subroutine I use to calculate the ceiling in my Excel spreadsheet: '============================================================================= ' calc_ceiling ' ' For every segment of the dive check that ascents do not violate a deco ' ceiling...

Here's how I calculate the first stop in my Excel spreadsheet. I believe I got the formula from Baker's fortran code. 'calculate the first stop at GFLo using the formula: ' D = ((P - GF * a) / (GF / b - GF + 1)) - Psb 'where: D = depth, P = total gas pressure, GF = gradient factor...

Mark Powell states that all dives are decompression dives in that the tissues offgass or decompress on ascent. My wife who is not a diver understands this concept. After a late night dinner of pepperoni pizza with extra cheese when we're in bed she complains. I tell her, "Honey, relax. I'm just...

And that's the problem. Some people don't pick up context. I've said this before in another thread that the term NDL is the problem because it is misleading. It implies, if you take the term literally, that you will not decompress if you stay within the limit. I offered the term NSL "No Stop...

Great! Now we have another useless signal. You know what's cool? Not diving with cool people.

Hey, back off buster! It's a sign of the wonderful, prosperous, and joyous lives we live. That there's nothing left to argue over except the most insignificant things like a snorkel.

Here is something I found on google concerning Gabe Watson: Watson served 18 months in an Australian prison after pleading guilty to a manslaughter charge, but is now on trial in Birmingham, Alabama and faces life in prison. His defense contends that her death was accidental while prosecutors...

She's using swim fins. A lot of people use them to strengthen their legs. I watched the video. She has a good strong kick but her form wasn't correct. I was surprised because she looked like a competitive swimmer. At the start of the next stroke she was moving her knees outside of her ankles...

Yes. More standardization. Let's use the NACD's one-handed signals, secondary regs on a necklace, and primary donation.

I haven't read all the posts in this thread and maybe my question was answered already but why are they charging so much? Not having to print and mail out a card is a cost savings for the company. Usually, and not always, they pass on part of the savings to the customer. So, why are they...

You would think. Of course it depends on how familiar they are with your equipment. I did a boat dive and we were told to leave our BCD's in the front of the boat on the floor. The crew would then put the BCD's on the tanks. Once the tanks with our BCD's were placed in the racks we could put our...

You say you'll do whatever it takes to avoid surfacing with a SurGF of 99%. That's easy! Just set your GFHi to some percentage less than 99%. The Buhlmann algorithm with GF's is designed to calculate an NDL based on GFHi. That is, as long as you ascend with more than 0 minutes remaining of NDL...

What I wrote in the above quote in bold is not exactly true. Unfortunately, I was going by memory. When I ran my spreadsheet and put in a dive profile, the result was SurGF was increasing but at a slower rate than GF99. Both GF99 and SurGF are converging as the diver ascends. At the surface...

Don't you mean last diver to the bar loses. :cheers: What's this 30 stuff?

One legitimate scenario is if a student starts drifting up because either they're too light or they haven't released enough air from their BCD. It certainly would help instructors and their DM's if they could know whether the ascent is an equipment, skill, or a health problem. The first two...

For those of you who are wondering how to signal going to a shallower depth since the thumbs up signal in OW means going to the surface immediately, the NACD recommends raising an open palm toward the surface followed by the numerical signal for the new depth. The open palm signal without a new...

I read the article by DAN from the first post and came across this: "The proper course of action is for the buddy to return the signal, terminate the dive, and head to the surface together. Without a prearranged communication plan, however, buddies who don’t know what is wrong may spend...

In the 330 dives I've done I have never opened a tank valve all the way and then a 1/4 turn back, and I have never had a problem with the valves. I suspect the people who have a problem are using too much force against the seat of the valve and damaging it so a 1/4 turn back becomes a remedy for...