FreeFlyFreak
Contributor
This is what the manual says.
I assume this means that the appropriate corrections for diving at altitude are applied no matter what altitude you are at.
So, in effect, every dive that starts above sea level is an altitude dive....it is just that the corrections are insignificant unless you start at...300 ft? 1000 ft? Unclear...but by 1000 ft they must be significant enough for USN/NOAA to worry about them.
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Which is why the Shearwater manual recommends turning the computer on before the dive to get an atmospheric pressure before submerging.