Ratio Deco

[jamesp]

Ahh I see I was wondering if there is an explanation of Ratio Deco for non standard mixes available? For example how to work out decompression penalties for a dive of mix X + Y. I have the feeling this may require a better understanding of physiology than a bunch of simple on the fly equations.

Read Deco for Divers.

Buy a VR3/suunto/Apeks/VPlanner/Decoplanner/extra set of fingers.

Accept that deco is neither an exact or perfect science, you are not a goat.

Realise that it is possible to dive without a Phd in human phisiology, decompression theory, maths or physics.

Enjoy the frigging dive.

[ootini]

Read Deco for Divers.

Buy a VR3/suunto/Apeks/VPlanner/Decoplanner/extra set of fingers.

Accept that deco is neither an exact or perfect science, you are not a goat.

Realise that it is possible to dive without a Phd in human phisiology, decompression theory, maths or physics.

Enjoy the frigging dive.

I have a Mares Nemo and use iDeco to do a lot of my planning anyway, I just liked the idea of being able to work it out in my head should the need arise.

[balbrigganbloke]

If you have a computer and a timer with a slate with tables you dont need anything else

[big_si]

I have a Mares Nemo and use iDeco to do a lot of my planning anyway, I just liked the idea of being able to work it out in my head should the need arise.

Wouldn't your buddy help you out should the need arise?

[ootini]

If you have a computer and a timer with a slate with tables you dont need anything else

Assuming the computer doesn't pack up and I don't lose the slate and tables. I know this is an extreme example of up-fuckery but still....

[ootini]

Wouldn't your buddy help you out should the need arise?

In theory yes, but I like the idea of being capable on my own "should the need arise"

I'm just after a bit of a " X + Y = Z" type affair, if such a thing exists.

[Woz]

Assuming the computer doesn't pack up and I don't lose the slate and tables. I know this is an extreme example of up-fuckery but still....

Then do some stops at 21, some at 18, 15, 12 and some more at 9 then sit at 6 until you're bored or run out of gas.

If you've lost that much then it's just not your day.

[Woz]

Of course if you use BSAC 88 tables, 3@9 and 18@6 is the most you can do...

[big_si]

Assuming the computer doesn't pack up and I don't lose the slate and tables. I know this is an extreme example of up-fuckery but still....

In theory yes, but I like the idea of being capable on my own "should the need arise"

I'm just after a bit of a " X + Y = Z" type affair, if such a thing exists.

Computer bust, slate and tables lost, buddy lost... Eeeek! Note to self, never dive with Ootini


As said previously you can spot suitable patterns using whatever gas you use... Plug some numbers into a computer planner whilst keeping as many variable the same as possible (e.g. % EAN or depth if the gases / type of dives you often do are pretty much to the same depths) and look at how the stop times vary with dive duration. Change the depth by x metres and do the same. As you do this you can see how those variables might form a model that you could use.

It's when you start trying to do it with different gases all the time that it's impossible (for normal folk) to keep the variables and trends in their heads should they need to use them. By having standard gases it's easier to do.

[Woz]

Or if you are really keen, do some 60min and 90min runtime slates for differing depths. Then stuff them in your pocket and hope you never need them. Pretty sure a RB diver on the S coast does this.