Another question... What is the recommendation of the default gradient factors (GF) settings for recreational diving and doing a dive with no mandatory decompression stops and a maximum of 40 meters deep? The default conservatism of the system is medium (40/85), Is this good for diving with other divers with other computers with different algorithms? Thanks
I know you've received a good answer above, but here are my thoughts.
See section 9.2 of the manual, and take my advice with a grain of salt...
1) The default GF's carry a bit of legacy bias due to older beliefs about optimal protection against DCS.
2) For no-stop dives, the lower the "high" number (e.g., the 85 in your 40/85 example), the shorter your NDL by a little bit, and the safer the dive from a DCS standpoint, though it's complex.
3) Therefore, choosing Conservative (35/75) should be safer. In fact, I actually dive my Shearwater to XX/70 for no-stop diving.
4) BUT... the legacy bias pairs a lower GFHi with a lower GFLo. That shouldn't mean anything for a no-stop dive, because the GFLo never comes into play, for all intents and purposes. But should you have an unintended deco requirement (you exceeded NDL), then your GFLo will give you a deeper first stop than I believe is best.
Without derailing this thread (because Gradient Factors is discussed
ad nauseum elsewhere) I would recommend you choose either Conservative (GF 35/75) or a custom GF like the one I dive, which is GF 50/70. I am happy to sacrifice 5 minutes of bottom time for what I believe to be added safety when doing 25 dives in a week on vacation.
So nobody in their right mind is going to tell you what numbers to use.
Except me.