From my experience, I would say it is a lot more common than many people realize. I'm aware of a couple of dozen people who dive with no training or certification. I have no doubt that there are many, many more that I'm not aware of.
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Hmm.. Ive never been aksed for a card to do a fill. That said, out of the 5 places ive had my tanks filled, 2 of them knew me since one was at the scuba club where i got certified and the DM that was assisting on our ow class was the one that opened the door on the 2nd.TSandM:The fellow whose name is on my OW card dove for three years before he got certified. I can see how you could do it -- I've never been asked for my C-card to get a fill, just to get on a boat.
Definitely a first here on Scubaboard.:11:ArcticDiver:Your comments have made me change my mind.
grassyknoll:Not being certified = Unknown level of experience, ability or skill.
grassyknoll:Certified = A known (and perhaps even acceptable) level of experince, ability and skill.