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All, There's a little more to the RGBM computers than just manufacturer inputs. The algorithm is correlated with published data from Profile Data Banks so the stops are not just "lengthy inserts". See, for instance, "Statistical Correlations And Risk Analysis Techniques For A Diving...

:shocked2:Yes, the nitrox and heliar NDLs are reversed. Best, KLD.

About 3/4 of RGBM DB is from C & C Dive Team Operations here at LANL (13 yrs). Most diving now is on RBs (heliox and trimix). More OC earlier, and some nitrox and helitrox for shallow (less than 150 fsw) recon and joint exercises still. Most depths vary from 150 fsw down to 400 fsw. On...

MM, For air/nitrox it's straightforward, The NDL, tNDL, is computed for a particular tissue compartment, tau, from the nitrogen M-value, where ln is the natural logarithm, tNDL = (tau/.693) ln [ (po-pa)/(M-pa)] where po is the initial nitrogen partial presure (usually 0.79 x...

Just FYI as per request Great perspectives. Reprinted from SOURCES. Enjoy. BW SOME EARLY EVIDENCE FOR DUAL PHASE MODELS By Brian A. Hills Editor’s note: Brian Hills was one of the early advocates of deep stops and dual-phase modeling. His work was long disregarded if...

Here are some inputs and ball park stats; 1) -- At DEMA last October, Dick Vann reported and gave me a diskette with 47 cases of DCS from some 75,000 profiles at DAN across rec diving, so rate is approximately 47/75,000; 2) -- rec meter...

Thank you, Mike. BW

JBD, GI3 told me WKPP started with standard Haldane and started shaving time, depending how they felt toward the end of the deco path. Plus reducing N2 (smart), and introducing deep stops (smart too). What works, works was a maxim. Same with C & C back about 12 yrs ago, but we...

Hi Dandy Don, Got emails to check in on SB, and with a few days off, picked up on some script. No, I didn't have a sex change, just picked up SB using my girlfriend's monicker. Yea, too lazy to change the cookies in my computer for SB. Good to hear from an...

A couple of others out there include: 1) -- Suunto VYTEC for rec/light deco air and nitrox diving; 2) -- HydroSpace EXPLORER for fullup, mixed gas, tech, deco diving; plus Mares, Dacor, and Zeagle are updating for next product offering. Plus Steam...

DB, Physiological factors such as age, sex, fat index, workload, cardiovascular capacity, water temperature, etc feed crucially into diving staging regimens. These factors are called J-factors (USN early nomenclature), and attempts have been made to roll data over them...

N, Be assured that "links" are in black on white in my books, and none are "missing". Info comes out of published papers in reviewed journals, so most would say you guys likely don't know how to connect the dots? Nor implement codewise. Judging from your email questions to me...

No flying time in a pressurized airliner assumes an "altitude excursion" of 8000+ ft in case of depressurization. A flight in a small plane without pressurization, drive over a pass, flight in a hot air balloon, etc is called an altitude excursion, and the LANL/USN procedures I mentioned...

Altitude Divers Here at Los Alamos National Laboratory, we have developed a set of altitude diving protocols that are now also sanctioned and adopted by the USN. Excursions in which the change in altitude (not altitude itself) are less than 2000 ft have little risk for air no-deco...

The NAUI RGBM (bubble) Plastic Tables are "out" a year and a half, and used in all basic classes -- 9 plastic tables for air, EAN32, EAN36 for altitudes from sea level - 2000 ft, 2000 ft - 6000 ft, and 6000 ft - 1000ft for rec (no deco) diving. They are furnished in student kits for air...

Fins, Busy day. Haldane was a great physiologist, but really missed the computational boat on bubbles. Also Haldane found deep stops were necessary for deco but had no way to put them in his dissolved gas (only) regimen. Chemists (like Hill and others) couldn't persuade him...

Ninja, Since this seems to be an item of interest, let me clarify a few things, lest somebody gets a wrong picture. I don't really care to pick on you, but anybody who emails me asking if "helium needs to be included in calculations for trimix", thinks "theory is good to all depths"...

DennyB, Good observation. Maybe check out the NAUI Rec and Tec Tables -- as published, tested, released and used in the field for TRAINING of divers (first, and foremost). The Rec Tables for air, EAN32, and EAN36 are trivial to use, and have simple "backup" rules, and range sea...

Ninja, Pretty ambitious undertaking (from your email to me about RGBM), and I hope you can come up to speed on some 50 yrs of deco science and experience real quick. And maybe get some diving experience in that range (guess you said you were just starting a basic trimix course)...

Those gradients are for saturation exposures, and the probability function (written down) tells the bends incidence rate for any surfacing gradient. Fits were done years ago to some 500+ sat divers. The "average" gradient is the value of Q integrated over the probability function, and the...