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This is a right side view of my rig. The right side waist strap is hanging down toward the bottom. Just above the D-ring I've mounted a ScubaPro pocket. It has a velcro closure at the top which is shown to the right in the photo above. I keep a slate in it and sometimes a mirror if I'm doing...

So, for those of you who do not know what NFL means apart from the three hours of hysteria we just witnessed a month ago; it means No Fun Limit. It can occur at any time but mostly rears its ugly head when NDL has gone to zero and you realize you don't have enough gas for those mandatory deco stops.

Sure, I would be open to a video conference. I have zoom and can use other software as long as it runs on Linux. Even though you are responding in English I have to state up front that I do not speak or understand Spanish. Furthermore, any information or advice I give you is solely based on...

Attached is another paper by Erik Baker, P.E. that includes tables for the m-values and slopes. It also includes formulas for computing the a and b coefficients.

Here's how I did it: '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 = GFLo, 'a = coefficient a, b = coefficient b, Psb = ambient surface pressure 'the first...

After reading the above couple of posts I couldn't resist posting this: In the early days of Windows the founder of Microsoft, Bill Gates, said this at a computer exposition: “If General Motors had kept up with the technology like the computer industry has, we would all be driving $25.00 cars...

All those divers standing on and bumping into the reef, regardless of who trained them, are DIR divers! In their case D.I.R. = Diving Intentionally Reckless.

When I started diving with a BP/W it came with a 2 inch wide crotch strap. While I didn't get chafing (I dove with a wet suit) it didn't feel comfortable. I finally ordered and installed a 1-1/2 inch wide crotch strap that got rid of all the discomfort. You can probably get a 1 inch strap. If...

I checked the NDL calculation in Subsurface and could not find any code that uses an assumed ascent rate.

We've already discussed that a predetermined ascent rate is used for some data but it doesn't mean that the rate is used in the calculations for NDL and deco. You need to look at the actual calculations to prove it one way or the other.

There is nothing in the Important message box above (and in information from other versions of the Perdix manuals that I've looked at) that indicate that an "assumed" ascent rate applies to calculations for NDL. For what its worth Erik Baker does not use an assumed ascent rate in his...

You said: "Put another way my instantaneous ceiling could be 20m (#1), but my "actual" (bad name) ceiling could be 15m, because as I ascend from 80m I offgas and I would be able to continuously ascend at whatever my configured ascent rate until I got to 15m and had to stop." This is exactly...

I posted some replies earlier in this thread and elsewhere regarding how ceilings and NDL are calculated. You can search for those responses. After reading the recent posts (dated 2024) I realized that I might be misunderstanding what you and others say by "assuming". So, there are two...

The A, B, and C tables for nitrogen and the table for helium can be found in Baker's paper "Understanding M-values". I've included it here for your convenience.

On the Perdix SurfGF is displayed post dive and counts down to zero as the leading TC off gasses. It might be displayed as GF99. I don't remember exactly. Whatever is displayed, SurfGF is equal to GF99 on the surface. I don't know what data and how long it gets logged once on the surface since I...

Unless I'm misunderstanding you you seem to suggest something opposed to what Erik Baker PE said. In his paper "Understanding M-values" he said, "This included M-values which expressed a linear relationship between ambient pressure and tolerated inert gas pressure in the hypothetical tissue...

I watched the video on hand signals. One handed signals is what I use and I've had mixed success in teaching my buddies to adapt them. Alas, old habits die hard. Cave divers use one-handed signals because frequently the other hand is occupied. The instructor in the video is using a variation of...

I misunderstood your original post. The two tanks are in parallel so given the same SAC rate you had more gas left than they did even though your tank pressure was less than yours. I still stand by what I said earlier, i.e. don't lie about remaining pressure. I agree with what others said that...

I meant to say the OP's gas consumption resulted in using 4000 psi of gas on the first dive versus 3000 psi for the other divers.

First, NEVER lie about gas remaining. Let's say it's a group dive and the DM gets everyone's tank pressure. He decides everyone has enough gas to swim farther from the ascent point. But, you lied and you eventually signal low on gas. The DM can't take the rest of the group back to the ascent...