Thank-you for the offer and the welcome back. I continue to be curious about the changed landscape. Now I have the money and the time to take whatever courses I want, but I'm not sure I would have pursued diving in my twenties under the current regimen. I wonder if other folks that were certified back in the seventies and eighties will chime in on this.
boulderjohn gave a great explanation at the start of the thread.
To make it easy for my brain to understand I break this situation down into simpler concepts
- training courses: there are now more of them
- actual diving: some ops need complicated rules
As already indicated in the thread, the old training has been split into multiple courses and additional courses covering other topics have been created. your c card is a training diploma. not a diving license. it does not license you to dive. it simply reflects that you passed a course. no one can undo history (well, we all forget parts of it...). You took a course, you passed, you were trained.
When it comes to real dives, it is now standard practise for an operator to require you to provide some proof of competency (unlike the old old days). But unlike driving, flying, doing lawyer or doctor stuff, there is no such thing as a divers license. And (in most places) there are no diving laws. So what to do? Make something up! Since there are no laws, each dive op is left to make up their own totally arbitrary rules.
All of the dive ops we use in the Caribbean have some very simple rules: produce any c card and you are good to go and dive as you wish with your divebuddy. There is no distinction made between OW, AOW, etc...
It is my understanding that many dive ops in some places in the US have made up a complex set of rules that do distinguish between OW, AOW, etc. We have never encountered these rules.