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George,

Great stuff.  I'd always done similar routines, but my system was much
more "gut-feeling", and less structured.  I'd never heard of a "Fibonnacci
sequence" before, but I won't forget it - it runs almost perfect numbers. 
My method for the gas switch is that you can generally repeat the previous
stop time each time you you do a gas switch.  In other words, if you do 45
minutes at 30 on nitrox, then switch to O2 at 20, the 20 stop repeats 45
minutes (but then you still have to add the ten-foot stop time on top of
the 20-foot stop time) That way, you can off-set the series by one
position at each gas switch. 

Incidently, on the 'breather, the curve is much closer to linear up until 
the 20 stop, because the PO2 is always changing.  I once lost deco data 
after 55 minutes at 290, on the ONE dive I neglected to bring a backup 
set of tables.  When surface-support sent me a new set of tables, I found 
that my "winging it" methodology was in perfect synch all the way to 
my 40, within 2 minutes on the 30, and within 15 minutes on the 20 (I had 
erred more conservatively on the latter two stops).

Thanks for your informative post.

Aloha,
Rich

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