I have never been asked for a C-card. After a short time talking I guess they figured I was OK. I did get a buddy to give me a PADI and a NAUI card after making a 900'+ sat run, but never had to use it.
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I dove from 1963 to 1980 without a c-card, as far as I'm concerned my "rights to dive have been [-]eliminate or[/-] restricted in order to save [-]us[/-] me from [-]ourselves[/-] myself......" I could have continued to dive without the card but the writing was on the wall in California and I had the time.
My point is that all this lack of diving knowledge causing accidents are happening to certified divers. Stupidity, irresponsibility, mistakes and bad judgment do not disappear when you get a c-card.
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If you want to dive off a boat without a card, charter a boat to be your water taxi, and you can dive all you want. Dive ops have a legal responsibilty.