CAPTAIN SINBAD
Contributor
I would respectfully disagree with the notion that you need AOW and Nitrox to do AOW dives. GUE and UTD teach more than just "Fundies" and "Essentials." As mentioned above, UTD has Rec 1 and then Rec 2 and that certifies you to be on charters on which AOW divers usually dive from. You can take Rec 3, though I would recommend Tech 1. By staying within UTD/GUE there is no depth that you an not dive that PADI is teaching. The only difference is that these agencies structure their training to require you to be more thoroughly trained for those same depths that PADI is letting you dive after a guided diving experience.