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Nope. You are badly mistaken. On and off gassing have to do with the inert gas pressure only. You even say so in your post above by your use of the term "partial". Flow of nitrogen in and out of the tissues is driven by the inert partial pressure of that gas. The quote below is from the...

This can't be right. The GF99 is the % value between ambient pressure (which is 0%) and the m-value at that depth (100%) for the controlling tissue compartment (CTC). Off gassing can only occur when the CTC pressure is above the ambient pressure which is the inspired gas pressure. Since GF99 of...

...and there are more factors: is this a repetitive dive (2nd, 3rd, 4th dive)? Was there a short surface interval? Is the dive deeper? Higher computer conservatism will have you going into deco sooner.

Thanks. It took me at least five years to get it close to what it is now, and I credit a few key people for helping me along the way. I have been working on a newer version to calculate a continuous ascent to the surface for deco dives. Unfortunately, because of all the additions in new features...

Yes. The spreadsheet is designed to mimic dive decompression software. It is designed as an educational tool with no safety warnings. It also does calculations for ppO2, NDL, ceiling, END, EAD, density, ICD, and gas usage. It supports up to five dive profiles which can be linked together to...

Using my example from above of GF = 60/80 and the first stop at 40 ft I get a slope of: slope = (80 - 60) / (0 - 40) = -0.5 GFcurrent = -0.5 * 40 + 80 = -20 + 80 = 60 ;first stop = 40 ft GFcurrent = -0.5 * 30 + 80 = -15 + 80 = 65 ;next stop at 30 ft GFcurrent = -0.5 * 20 + 80 = -10 + 80...

After re-reading the above post I realized the Schreiner I cited above might be confusing. I copied it from my code in the spreadsheet and the function name in VBA for e raised to some power is EXP. Let me rewrite the equation to make it clearer: p = Pi + rate * (t - 1 /k) - (Pi - Po- rate / k)...

Thanks JMarc. My post above is corrected.

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...