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Good point. But I would guess some places (like apparently N.J.?) wouldn't like your idea, realistic as it is....I can't begin to count the number of times I have yelled at idiots in boats for driving right up to a dive flag and start messing with it. When I have had my flag messed with I wish I could come up with a 12Ga bangstick to their engine compartment.
I have stopped using flags most of time because it creates more of a hazard than to not have one.