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Your certification card should not be looked upon as a "qualification" but as evidence of a certain level of training. A basic open water card certifies that you have received training sufficient for you to make unsupervised dives with another certified diver under ideal conditions in no greater than 60 feet of depth.
Dive operators may choose to accept your certification or not, acording to their own practices. Some operators require "advanced" certification for some or all of their trips. Other operators may require professional supervision. Still others may make decisions based on your diving experience, as evidenced by your dive log. For the most part, the "rules," if you can call them that, are adhered to on a voluntary basis.
I hope I came close to answering your question.
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