Quote: (Originally Posted by schwerve)
OK, I'm old enough, and I have 260 or so logged dives - although maybe it needs to be 50 dives on "advanced" mixes? In any event, the prereq certs baffle me a bit; I figured my PADI EANx cert (where x <= 40) would be enough to satisfy that.
CCR's use pure oxygen in one cylinder and mixes are dynamic dependant upon depth. <6m can be pure oxygen.
Adv nitrox courses prepare you for this.
Brent
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