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john j · (This post was last modified: 06-02-2010, 04:41 PM by john j.)

See Page 75 of the Vision Electronics Manual. If you don't have a copy, you can download a free PDF file copy from

A setting of 90/90 is very aggressive (too little decompression) and I would advise against that setting.

A starting point given in the manual is GF LOW = 15 and GF HIGH = 85. I would call that an "average conservatism" setting and that's about what most people use from what I have seen. However, I don't think that setting is overly conservative and I personally set the GF LOW to 10 (which is even more conservative than 15) because I want more deep stops. Some people believe deeper initial decompression stops are helpful. Lower values of GF numbers give longer decompression stops. GF LOW sets the deep part of the decompression and GF HIGH sets the shallower stops. Al,s setting of 30 for GF low is less conservative than what I would call "average", but what works, works as they say. Al is in pretty good shape.

Decompression theory is not well understood and there are many variables, so you should error on the side of caution of course. Also, proper hydration and avoiding fatigue are super important in avoiding decompression sickness.