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> I use a modified saturation calculation formula that is
> capable of calculating linear accents/descents without
> interpolation. The formula was derived by solving the
> underlying differential equations for accent/descent
> profiles with an initial (inert)gas change.
> <SNIP>
> The simulation results suggest that my formula is right.

FYI, this formula can be extracted from Dave Waller's
divecomp.c (http://wrolf.net/divecomp/index.html).

For those without web access, here are the comments from the code;

   P(t) = P0 + (PA - P0 + r*Th/ln(0.5))*(1 - 0.5^(t/Th)) + r*t
  where,
   P0 = Initial pressure of compartment (fsw)
   PA = Initial ambient pressure (fsw)
   r  = ascent/descent rate
   Th = compartment halftime

Greg
--
Greg Roach, Stony Stratford, Bucks, England
Home: greg@su*.co*.uk*
Work: groach@uk*.co*.uk* 
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