Belzelbub
Contributor
I'm going to go with your settings are fine. The algorithm Suunto uses tends to get more conservative as the dive count racks up. Especially if the surface interval may have been less than Suunto wishes. Oceanics do tend to be quite liberal on the first dive (DSAT), but this changes on subsequent dives and it moves more conservative when compared to Buhlmann.I just did two days of meg tooth hunting and used my Peregrine. The dives were 35 ft max and I averaged 105 minutes per dive - 3 dives per day, so total of 6 dives. I was set on Air at 21%, moderate conserv, and had the same dive profile as everyone else (because you literally could NOT go deeper than 35ft).
After the last dive everyone was commenting that they had to end the dive because they were at between 2 and 5 minutes of NDL. My computer still said 99! I sent a message to Shearwater this morning and we'll see what they say, but I'm really curious. I know someone was diving a Suunto, and Roger was diving an Oceanic (and his might be set on conservative). I'm wondering if there's a setting I missed?
21/00 not 21/100. 2nd number is the Helium %. Peregrine doesn't have helium capability, but the firmware is the same as Perdix and Petrel, so it displays that way. 21% is air, but air is Nitrox as well. Just not enriched. Plus as mentioned, Nitrox is the mode. Nitrox mode makes sense, though you could also use Air. Setting it at 21% when in Nitrox mode is considering your mix as air.Also, I have checked, double checked (with R looking over my shoulder - on the boat and again today) and made sure I'm at 21%. BUT there is screen on the app version that shows my Computer settings and it looks like even though it says 21/100 it says NITROX. I'm flummoxed.
Your computer is set at 40/85, which is moderate conservatism. I noticed on both my Perdix and Garmin that doing long shallow dives doesn't do much to my SurfGF. It's generally in low single digits, so not likely to exceed NDL anytime soon. Even on multiple dives over an hour each.