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Billy,

Maybe something interesting will come out of the dr buttcrack thread.

> I also
> fill my deco cylinder with 50. You, being ignorant about advanced
> diving, will be surprised to learn that 50 is the optimal decompression
> gas for dives down to 60 metres, beyond which the addition of a
> sling of 02 makes the ideal deco combination for dives to 90 metres.

I have also noticed that when using software that uses gf's to control ascent
(in my case
Decoplanner), the software will give you a shorter deco using 50% rather than
100% in, for
example, a 30min 40m dive.  I assume that this is primarily because you open up
the o2
window earlier in the dive when you get on to the 50% and because you are
starting deco
deeper due to the gf settings.

However I have always choose to use 100% as my first deco gas (adding in 50%
and 35% as I
move deeper or stay longer).  The reasons are primarily the same as those for
not using
80% as a deco gas.

Am I missing something missing here ?

Simon Murray
South Africa

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