Wade wrote, in part:
>Furthermore, unless you do a massive set of  measurements on many
>individuals, you can't even say how much more safe you are with one
>computer vs the other.   You're safe enough.

The way I understand it (and I realize I am greatly oversimplifying), dive
computers make assumptions on bottom time remaining (tissue saturation,
etc.) based upon a theoretical mathematical model.  As we all know, these
computers cannot monitor the actual physiological functions of an
individual diver, but are just assumptions.  The newer of my computers is,
as Kuty said, a new Sunnto with what they call a Reduced Gradient Bubble
Model algorithm, based upon Doppler research done by DAN, and others. It is
more conservative than the older algorithm based upon the classic Haldane
model.  Even though the RGBM is based upon a lot of actual diving studies,
etc., it is still just a guess, and that was my point.  As others have
pointed out, the computer does not actually know what MY level of tissue
saturation actually is at a given point.  In light of this, I don't think I
am required to have absolute faith in either computer, or not use them, as
Wade seems to suggest.  It can never hurt to add a little extra margin of
safety, given that in the end, even the new computer is just guessing. :)

Dive safe,

/Don