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I just found out that Ross Hemingway has put out a VPM (Varying Permeabilty Model) decompression planner. I have downloaded it and compared it to some GUE Deco Planner profiles as well as Z Planner profiles. It is comparable to Deco Planner (a bit less conservative) and much less conservative than Z Planner. The best part is that it's free, but the model was developed by Younte, Maiken, and Baker -- these guys know their stuff. I would suggest that anyone into this type of stuff check it out.
Most programs are way too conservative. I don't own Deco Planner, but I have a few tables from it. I know Z Planner is WAAYY too conservative. This one (V Planner) is much less conservative. I like it so far. The problem with all of these is they don't keep you at 70' long enough on 50%. One to two minutes isn't long enough to do much good. We always stay about 5mins at 70' as a safety factor (i.e. getting decompressed earlier) in case we have surface prematurely.
Perhaps we just found something to agree on! I personaly find that GAP is the better one, for me, to use. It seems to run neck to neck with most of the usn tables (cept for acellerated deco w/ o2 and extended range)
Also with GAP I really hate the report system and love the interface. I dislike the interface with decoplanner and departure seems very good so far.
I haven't played with GAP either, but I have heard good things about it. Irvine will even give a less-than-reluctant nod to GAP, as he was part of the guinnea pig process with it. With Deco Planner, you have to reduce the conservatism factor bunch, I guess. With this one (V Planner), I have the factor on Nominal (least conservative). We throw in our own safety factors as the dive requires.
If you get a chance, I'd like to see a side by side comparison of GAP and V Planner (say 150' 45mins, 21/35, 50% & O2 deco). Just for curiosity.
Before I post the info I would like to say if your reading this and plan to dive this profile then KNOW WHAT YOUR DOING! Do *NOT* rely on something you read off the internet to substitute training and experience!
With that said here's the info
Assuming you switch to 100% at 19
stop ft/ min/mix
With vplanner I get this
Stop at 80ft 2:00 (48) on Trimix 21.0/35.0, 0.72 ppO2, 30ft END
Stop at 70ft 2:00 (50) on Nitrox 50.0, 1.56 ppO2, 32ft END
Stop at 60ft 2:00 (52) on Nitrox 50.0, 1.41 ppO2, 26ft END
Stop at 50ft 2:00 (54) on Nitrox 50.0, 1.26 ppO2, 20ft END
Stop at 40ft 4:00 (58) on Nitrox 50.0, 1.11 ppO2, 13ft END
Stop at 30ft 5:00 (63) on Nitrox 50.0, 0.95 ppO2, 7ft END
Stop at 20ft 9:00 (72) on Nitrox 50.0, 0.80 ppO2, 1ft END
Stop at 10ft 10:00 (82) on Oxygen, 1.30 ppO2, 0ft END
This looks like some computations for deep stops factored in. With GAP I have that turned off and no conservatism. Vplanner appears to have some factored in by default and not user setable.
Now with GAP's deep stops and conservatism turned on I get this