matching GF's to V-Planner and others?

Dsix36

I need some input about all of the deco software out there. I have searched the forums and have not found the answer to this confusion.
I dive an Optima with HammerHead electronics. The deco calculations are done via GF's.
I have been using V-Planner for dive planning and for calculating bailout. I recently installed MV-Plan as another deco software. I have been "playing" with both softwares and trying to figure out which conservatisim setting in V-Planner will somewhat match a GF of 25/85. I was shocked to find that +4 was very close.
I have calculated all of my past dives with a 0 conservatisim and it would appear that my bailout gas was insuffecient for the dives.
I am in fair shape, don't drink, don't smoke, don't exercise but work at a very physically demanding job.
I have tried XS, freeplanner, gap, decocheck and a couple of others.
Software needs to be able to run with emperial units because I don't know that metric stuff.
I am guessing that 0 conservatisim is the same as 50/100 (bent)
Any and all insight will be appreciated.

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THE MORE THAT I LEARN, THE MORE THAT I STILL NEED TO LEARN!!!!!!

single tank numpty

So you've been diving and trusting V-Planner for a while (As I do) and then you buy something new, it tells you something different to V-Planner (That you've dived and trusted for a while) and suddenly V-Planner (That you've been diving and trusting for a while) was wrong all along even though you never got bent while you were on it.

Hmmm.



On re reading, that sounds rude, it isn't mean't to be. What works works. I'm surprised at the difference in the two. I dive (OC only at moment) V-Planner plus 2 on B for smaller dives in the 150 - 175 ft range, and it is more conservative than DecoPlan at 20:80. But then if you ramp up the Helium in the mix the Buhlmann starts to give relatively more deco. All it means is that find out what you are comfortable with and go with it. Just because something new says something different means nothing.

Dsix36

No No No No No No No No No No No No

I was trusting my HammerHead!

I was using V-Planner to figure bailout gas. I just didn't have the conservatism set right. MV-Plan works using GF like my HammerHead does.

I just want to make sure that I have enough bailout gas if it hits the fan.

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single tank numpty

Ah .... errr..... I'll shut up ten shall I. I knew that there was a reason that I stopped going on the forums. But then I tried a rebreather and realised that I was a newbie again. Just when I think I'm out ....... they pull me back in.

jkaterenchuk

I have a nice little planning sheet that helps you do a manual calculation of gas requirements. If you would like I can send it to you once I get back home.

John

mempilot

Don,

On most of the dives that we do here in SFL (130 to 200 fsw range), I run a lost deco gas calculation. I double my SAC and calculate bailing out at the last minute on the bottom prior to ascent. By running a lost gas scenario, double normal SAC, and worst case bailout point, I get the maximum volume of gas required for each gas mounted. This provides a very nice buffer in most cases, and since we are not doing 3000ft penetrations, it seems pretty safe.

Just keep in mind the type of diving you do. You will probably get all kinds of advice for diving that you are not engaged in; ranging from cold, high work load, long cave or wreck penetration. You have to decide whether you will need OC gas to get out of an overhead and then up and adjust accordingly. I don't like to plan for SCR gas extending as the primary means of getting out, but more use it as an option.

For our dives down here less than 200 fsw, I have never had to take more than an AL80 and AL40, and usually it is just two or one 40.

As for GF's and V-Planner: well, I used to use Decoplanner on OC with GF's and now I use V-Planner and the modified VPM on the VR3 for shallow deco dives and V-Planner and Buhl on the VR3 for deeper deco dives. I always cut tables at zero conservatism to know what my absolute numbers are. They can easily be padded on the fly if I'm down to using tables and a timer. For the computer, I change the conservatism based on depth, time, and repetitive nature of the diving. Be realistic on your SAC input for v-planner. During stressfull events, you will breath much harder than normal.

This doesn't really answer your specific question about the HH and V-Planner, but may give you some ideas for planning.

See you on the boats,

Eric

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Eric Stadtmueller, otherwise known as, MEM "Da Pilot"

rossh

Hi, Getting all these different models to align is hard. They tend to only align by coincidence within a certain range of each other. It's more a case of two model details aligning as the are passing each other. The settings that align two models at a given block or range of depths and times, may not work for a different set of depths. Using one model for all your planning is the easiest approach of course.

Sorry - I know this doesn't help your problem much.

Regards

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Regards, Ross Hemingway

www.v-planner.com

Dsix36

You can never escape the dark side.


That would be great. PM me when you get home.


I generally do double my gas from what v-planner states. I will keep in mind the other points that you mentioned too. Thanks.



Very good point about the differnt depths. I had not thought about that. I was "playing" with the same depth for examples.



.

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mempilot

Correction for my post above:

Should read, "NOT doing 3000 foot penetrations." Subliminal maybe.

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Eric Stadtmueller, otherwise known as, MEM "Da Pilot"

Dsix36

I thought it was just your sarcastic sense of humor. You should have left it alone, now everyone knows ......... better left unsaid

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THE MORE THAT I LEARN, THE MORE THAT I STILL NEED TO LEARN!!!!!!