steveann
Contributor
While I don't know much about PADI or NAUI (although I will say that I have seen an inordinate amount of PADI "courses") I am familiar with SSI and SDI/TDI. Between those two, there seems to be a large difference in skill/knowledge requirements. SDI, which takes a lot from NAUI (so I would guess NAUI is similar) requires a lot more in depth knowledge on dive physics and physiology. Whereas in my SSI OW class, we learned that stuff floats or sinks and you have to compensate for that (in a nutshell) the SDI course has you calculate the amount of bouyancy of objects. I thought this most interesting, as it helped me understand the weighting concept much better (no more magic or trial and error weighting, I can figure it out pretty dang close now).
As for AOW, SSI does have an Advanced class, although it might just be a shop by shop thing (most shops have them though) where you get your four specialties in a week or less.
Of course, in the end, it comes down to two things, really. The instructor, and the diver themselves. Would I have understood the weighting concept better in an SDI course? Probably. Did I understand it enough to realize that I had to compensate my buoyancy for gear changes. Yes. Would an SDI course have made me a better diver? Probably (from a knowledge point of view). Was I not a good diver before I knew about Archimedes Principle and it's application to diving? I wold hope not (although that would be something to ask my dive buddies). Each agency has it's ups and downs, I think the diver themselves brings about the quality of the instruction.
As for AOW, SSI does have an Advanced class, although it might just be a shop by shop thing (most shops have them though) where you get your four specialties in a week or less.
Of course, in the end, it comes down to two things, really. The instructor, and the diver themselves. Would I have understood the weighting concept better in an SDI course? Probably. Did I understand it enough to realize that I had to compensate my buoyancy for gear changes. Yes. Would an SDI course have made me a better diver? Probably (from a knowledge point of view). Was I not a good diver before I knew about Archimedes Principle and it's application to diving? I wold hope not (although that would be something to ask my dive buddies). Each agency has it's ups and downs, I think the diver themselves brings about the quality of the instruction.