Computer Nitrox? does that mean you cant dive without a computer?
SDI Computer Nitrox used to be called, I think, Easy Nitrox.
SDI was, I think, the first agency to teach OW without teaching tables, relying solely on computers. As of last summer, I think PADI started offering the same thing, at least as an option. But anyway....
SDI Computer Nitrox certifies the diver to dive with Nitrox, but, again, does not teach any tables (other than reading an MOD table). No math. No EAD stuff. No point, really, if you assume the student is SDI OW trained, which means they potentially have no training in tables at all anyway. They (We) are trained to understand what the MOD is, how to analyze the gas, etc..
Does that mean an SDI Computer Nitrox diver is going to get carded and denied a Nitrox fill or a dive if they aren't/can't prove that they will be diving with a Nitrox-capable computer? I don't know, but I highly doubt it.
I took TDI Nitrox last weekend. There wasn't anything in that class that wasn't in the SDI Nitrox class except the actual use of dive tables to do planning instead of using a computer. And just as well, it seems to me. I'd say there's a lot greater chance of a recreational diver making a bad mistake if they are using tables to plan a nitrox dive versus the same diver using the same analyzer to check their gas and then plugging the FO2 into their dive computer.
EDIT: Maybe I should have ordered my points differently. Really, the point is SDI OW certs aren't trained and, thus, not certified to dive without computers anyway, Nitrox or not. Unless the instructor goes above and beyond the standards, of course. So, having a Nitrox cert and still being required to use a computer doesn't really change anything for the SDI diver.