Actually I am not wrong and no offense intended. I have both computers in front of me. I did say it was a Cressi and not a Suunto and on nitrox.I just got my old vyper out and confirmed you are wrong. I dont mean that in a rude way at all so please dont take offense but I did a dive plan on air on both the suunto vyper and my perdix. At 90 feet it says 22 while the perdix says 20min. The perdix is more conservative...yes only by a couple minutes...but none the less suunto is one of the most conservative computers and it surprised me the perdix even on low was still more conservative.
So went back and ran air for comparison. Both on low, the Cressi takes over at roughly 60 feet. Cressi NDL on air at 58 feet is 50. On Petrel at 60 it is 49. (For comparison at 88 feet its 22 also for the Cressi so essentially the same as your Suunto).
But on nitrox, at 88 feet the Cressi NDL is 32 and at 90 its 31 on the Petrel. Interesting. Seems like something more then just EAD at play here.
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