Nobody has "taken away" my certification--I simply got mine updated. I contacted NAUI when I began traveling and going on dive boats and got funny looks because my C-Card said "Scuba Diver" on it. These days that means something like you are qualified to go diving in a swimming pool with an instructor. They didn't have any records earlier than 1970 but, as it turns out, I went through the class again in '83 along with my ex (just to make sure they didn't leave anything out) plus I sent them copies of my original C-Cards (both paper and plastic) along with the name of the dive shop and instructor. They sent me a "Master Diver" card. From what I read on NAUI's web site you currently need to take 10 separate courses to get a Master card. My original course cost $20. That was 1969 so, based upon northernone's math, I think that comes out to about $89 present-day dollars. It was a special, during the week course and I'm guessing business was slow. We spent most of the day, five days a week, for two weeks in the classroom, the pool, and the ocean. I'm guessing that today 10 courses would be somewhere in the neighborhood of $4000. To me it's very plain that there is more money to be made with separate, "specialty" courses.
We were taught that 130' was the "recreational limit" but were also taught about doing decompression dives and how to plan them. We were also taught about such things as wreck penetration and cave diving and what precautions to take but as I recall it was not something that you just went out and did, it was more like something that you sought more information about and hopefully could find someone with experience to guide you. IOW, I felt that my original course was somewhat of a "basic introduction" rather than attempting to be an in-depth course on everything. In the back of my mind it could be summed up as something like: "sure, if you want to go cave diving, go ahead, but make damned sure you know what you are doing beforehand." In any case they did touch on a lot of different aspects of diving in one course that they do not seem to include with the present-day methods. I never heard the expression "Open Water" until a few years ago and had to ask what it meant. To summarize, my definition of the phase "Scuba Diver" on my original C-Card meant that I was qualified to do whatever I wanted as long as it wasn't something stupid.