in Texas the jet skis use the flags as racing buoys. sometimes they will get a whole slalom course if you have your buddy carry one.
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Here in AZ you don't need pass a test or hold any kind of license to operate a boat - I think you have to be over 12 or have a note from your mother. You just need to have the boat registered with Game and Fish and, seeminlgy, copious amounts of cold beer. The best advice I can give is to treat diving in an area with boat traffic like you are diving in an overhead environment. I have a dive buddy who just sets his dive flag on the shore to mark his entery point and doesn't surface until he is in water shallow enough to stand in. (for you boaters out there that means about waist deep) When boat diving I kinda like the double dive bouy and shotgun approach. I'll suggest it to my buddies at the Scubateer's.
AZ dive flag laws have some idiosyncracys when compared to the laws in other states, not the least of which is they are merely suggestions without any kind of fine or penalties.
Steve.