Be careful with your demands to authority... there are probably 25 boaters for every one of us, 25 votes to 1. They could easily "solve the problem" by making laws that keep divers away from anywhere there are boats (it has happened in a few places already), and that isn't a "solution" we want.
We need to approach this in a friendly fashion, not as adversaries - we want to help boaters to be alert and aware of divers/diver down flags so they can avoid us because they
want to, not because they have to.
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--- edit: looks like RonFrank beat me to the punch