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hsnowden:I'll agree that Cozumelis a more complex dive. I would aslo agree the Comal River should not be used for certification dives.
Current is what gets most people. Entry, descent, depth, and a safety stop may not be involed, but with buoyancy and trim in a working current things are going to be a lot different than bouyancy in a lake. Weighting going to be different anyway going from fresh to salt water. Comal is good for Learning how to manuver in a current with out running in to things. Really all I'm saying getting in the water anywhere after two years would ge a good idea. Besides, where in the San Antonio area are you going to get a condition like and dive at Cozumel? Medina vis has gone to hell, Canyon Lake and Lake Travis are packed with students tearing vis up.