Question Shearwater GF99 vs Baker's Gradient Factors

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Wonder what the SurfGF would be from a 60m/200ft dive some 4 hours later? The main challenge is it's not available post dive (or is it?!?).

Must have a look at this after surfacing.

If you're on the surface, the SurfGF is the same as GF99.... So.... ?
 
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