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The main difference is that most, but not all, divers can do a controlled emergency swimming ascent (CESA) from 60 ft or less. How often is that necessary? I've never talked to a diver who has had to do one (maybe we should do a survey here to see how often it has been required of the general scuba population).
My question is why would you object to taking continuing-ed courses? If you're a "serious confident" diver then I don't understand your objection.
R..
To the OP
Diving is one of those things in life where being conservative is never a bad idea.
I am not trying to be critical here but based on your questions here and in your Nitrox thread you should probably break out your OW training manual and spend some time reviewing it. Asking questions here is good but you will probably find the answers in your manual more concise. Just because the course is over doesnt mean you cant keep using the manual.