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>The *only* thing I could think of is that Sheck's
>algorithm accounts for bubble formation and subsequent growth on the
>second dive....which means his program is a virtual IWR calculator!?  I
>really wish he was still with us so that I could ask him.  Does anyone
>else understand the math he put into the program?

The math Sheck put into his program is the Buhlmann's ZH-L16 algorithm with 
these modifications:

 - instant descend to the bottom is assumed.
 - the time to first stop is included in bottom time at maximum depth for 
decompression calculation  (he does that using recursive functions).
 -  the bottm time is further adjusted by a logarithmic function of time that 
has the effect of making the tables generated by DR.X equivalent, or more 
conservative than those of Hamilton Research Ltd. and Oceaneering 
Corporation.

Sheck did not want to alter any parameter of the ZH-L16 model.

This information comes from "MIXED GAS MADE EASY, A Strategic Planning 
Approach To Trimix, Heliox, Nitrox, EAN, Air" by Sheck Exley (this was his 
Mixed Gas Diver student manual).

To my knowledge, his software has no other particularities regarding 
decompression calculation.

Michel
BP7Y@mu*.mc*.ca*

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