When my Nephew warned me that the Zombie Apocalypse was coming, I never expected that it would first appear on a Scuba Board Post. Will this thread never die?
No. Here is one reason.
"which is one reason I dive NITROX on all Cozumel dives,"
I am not saying that this approach is bad but I will say that I do not subscribe to it. My thinking is that a typical first dive is at a place where a down current or diver issues might (rarely) cause them to get below suggested limits of nitrox. Using air provides me more flexibility in responding to an occurrence of this nature...even if it never happens. I know my reasonable acceptable depth limit on air. I have not determined it for nitrox 32 or 36.