Wish for VPM algoritme

[Steve]

I don't know if it is on the to do list or not but I see there are some forum posts with questions about VPM. Is it possible to introduce the VPM algoritme into the OSTC? I think it is technically possible. Here you have a link to VPM programs and somewhere on the site you can even find the algoritme itself.

http://www.decompression.org/maiken/VPM ... ograms.htm

I found out that V-Planner Live is only for the X1 but as the algoritme is free for everyone it maybe can also be implemented on the OSTC.
VPM and RGBM are almost simalar and both are newer decomodels than Buhlmann. If the memory of the OSTC is not able to load the Buhlmann algoritme and VPM maybe you can make 2 different firmwares. One with Buhlmann and the other with VPM so we can choose wich one to use.

thanks in advance,
Steve

[corona_citron]

Sincerely... if you use adequate GF, you'll get a VPM

[angelain]

corona citron :

What you tell is correct and incorrect:

try a dive with trimix 20/25 and deco gas EAN70 to a depth of let's say 60m and bottom time greater than 60 minutes, and run the simuation with a program that runs on Gradient Factors let's say 30/90(which is allready rather agressive), you'll get a total runtime of about 220 minutes/depending on which program you use.

Try the same with dive with the same factors(gasses/depth/time) with a VPMB program set on +2 conservatism, and you'll get a total run time of 204 minutes/depending on which program you use.

(I used Freeplanner in this case because it shows me both Gradient Factor and VPMB for the same dive).

OK, that's only 16 minutes, but the longer the bottomtime, the greater the difference gets(I know one should watch his OTU's and CNS ,and gas planning but just to show you there is a difference).

Try it you'll see it: example bottom time = 80 same dive same mixes difference is allready 42 minutes. and so on.

If you take bottom times up to about only 40 to 50 minutes, you can get about the same dive as with VPM(B), but if you start taking higher bottomtimes teh differnce is there, you can even find documents on the internet showing you the difference.

Conclusion:
Some people like GF , some like VPM(B).

It would be nice if one had the option...
And if someone could write the software....sourcecode for the OSTC.

[corona_citron]

you can try 30/75 of something like that and I'm sure you'll get the same curve....

[angelain]

corona citron : check it out, even with GF 30-75 you won't get as soon out of the water as with VPMB. No matter what settins you use, or you'll get a skull on your OSTC
Check out the OTU's and CNS also....

[angelain]

here you can see the curves...
Greetz...

[corona_citron]

ok. It could be but the real question is : why do you want to use VPM ?
If you get deep stop and if you get out fit and well... is that not enough ?
I 've tried a lot a feature, deco and other funny things and the best compromise is for me 30/85....

[Steve]

I bought GAP lite for my PDA lately so i could run Bühlmann with GF or RGBM
I had V-planner with VPM already on my laptop, this was the main reason why I wanted the OSTC to run VPM.
Another reason is that most of my friends use V-planner to plan their dives, so i would still be handy if the OSTC could run VPM as the X1 can.

it is just handy that u use the same model as your buddy.

[corona_citron]

ok. But I don't dive with buddies....

[angelain]

Hi Steve and corona(luv that beer with a twist of lemon/citron);)

Corona : the question is not why does one want to use VPM, but when does one want to use VPM(B).
When would someone use VPM algorithm instead of GF? Well as you can see , with longer bottom times on great depths( deeper than 40m) , you get out of the water sooner (and have built up less percentage CNS en OTU's), I'm not saying it is safer,but that study is something for someone with bigger brains than mine...
Also a lot of dives have allready been done with the VPM(B) algorithm so I think it is safe, I'm not saying GF has not been used a lot and is not safe, my personal opinion is that is even safer, but as I told I'm not that smart...

Anyway, it's not in my kind of diving yet to get out of the water sooner because of VPM, because right now I'm still working on getting my Normoxic...
So deeper than 60 and longer than 40min willnot apply to me yet not even in the near future...
Maybe in the further future...(when I will be with the happy few...?)

Steve: indeed is it much easier when you have the same algorithm as your buddy

[corona_citron]

I feel good with GF 30/85. I've dived 150 minutes at 100 m today and I'm happy

[angelain]

wooow must have been a great dive.

and with a (I mean : one!!!;)) corona with a twist of "citron" after the dive even better lol...

greetings, Alain.

[Steve]

where do you do these kind of dives?
Ever exceeded the 100m with the OSTC?

grz,
Steve

[corona_citron]

in gwadeloupe.
Exceeded ? Yes, a little bit. 102 m . The OSTC simply stops running.

[sailor]

For me the OSTC kept on running on a dive to 112 meters.
I don't think the software or depth sensor is the limiting factor.
I think the case is the limiting factor regarding depth.

[corona_citron]

I was with the 1.40 version