M-values and Gradient Factors

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Thanks Duke, I understand that, and the course mentioned as well wat was the low and high GF , I guess it is how John mention, one decides how willing/risk one want and raise the High GF in order to get out of the water quicker under normal circumstances,

even that the trend is 50/80, I think I will remain in my 45/75
 
Thanks Duke, I understand that, and the course mentioned as well wat was the low and high GF , I guess it is how John mention, one decides how willing/risk one want and raise the High GF in order to get out of the water quicker under normal circumstances

GF that matters is the "GF current" at a decompression stop. It equals GF low at the first stop, GF high at the surface, and is somewhere in between the rest of the time. On a no-stop dive that collapses to "GF high always" because the surface is the only stop, but on a no-stop dive "getting out of the water quicker" is not an issue anyway.

As I understand it, the current trend in deco diving is to raise GF low to make shallower stops.
 
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