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> Also, as you point out further down, "as MigPlan has built in safety in
> taking ascent to first stop as part of bt."  So the diver wasn't off his
> bottom mix as early as possible, but the programme thought he was *at*
> the bottom.

I don't agree this is an additional safety factor.  My interpretation of
Buhlmann tells me is that this is the only acceptable method for
generating high-exposure tables. 

He says, almost flippantly, that you can use a 30ft/min ascent rate with
his tables.  I don't think he says that you should use the 30ft/min ascent
rate with his raw algorithm.  Certainly on light exposure air tables, such
as those he has published, this is just fine.  On heavy exposure tables
using Heliox and Tri-Mix, I have not seen anything to convince me that
using the 30ft/min ascent rate and ignoring on-gassing during ascent is
acceptable.  

Some people might argue that you should calculate ongassing during ascent
based on a 30ft/min (or some other) ascent rate.  I don't think this is a
good technique because I don't belive most divers can control their ascent
rates so precisely. 

>3.  As for using MigPlan on the dive.....the diver was using a pirated
>copy.....pirate beware!!!> 
> I'm sorry, I haven't got the faintest idea how this relates to the safety
> or otherwise of a particular algorithm.  I paid for my copy of Sheck's
> DRX and that didn't protect me.

If the person was using a pirated copy, he may not have a copy of the 
manual and/or he may not have recieved training in mixed gas diving.  
Therefore, he could have mis-understood the run-time format of the 
tables, for example, perhaps causing his hit.

> You seem to have missed my point entirely.  I wasn't saying that MiG plan
> was death on wheels or that you can't dive it without getting hit.  What
> I was objecting to was that Jody implied that there had *never* been a
> problem with *anyone* diving on MiGplan.  This is plainly absurd.
> He also *associated* mig plan with the *testing* of the Swiss algorithm
> and then with the next breath *disassociated* MiG plan from any hits
> sustained by users of the Swiss algorithm.

This point is well taken, and I retract my earlier statment that nobody 
had been bent on MiG Plan.  Thank you for pointing out my error.

   Jody Svendsen
   MiG Technologies

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