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> I have a question about algorithms used in deco programs.
> 
> Given that the Oxygen window theory is fairly widely accepted, why do none
> of the deco calculators (including the one used by GUE?) take this into
> account when creating profiles? (tell me if I'm wrong), ie add a long stop
> at 21m (or whatever depth is 1.6atm ppO2) and trim the shallow stops.
> 
All the profiles I have created using Z-Plan, V-Planner, Gap, etc using 50%
for deco seem to only have a 1 or 2min max stop at 21m then conduct most of
the deco up in the 6m and 3m stops.
 
The norm I have seen locally is to fudge the resulting profile based on
experience and rules of thumb after it has been calculated (ie Add a long
soak at 21m then trim off the shallow stops or reduce the conservatism or
put in a 21m waypoint then calculate the ascent from there) rather than get
the tool to build it based on the correct inputs.

Thanks in advance

> James Dibbs
Sydney Australia

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