From my experience, where the cops are NOT is patrolling almost anywhere after
dark. I bet more constituants care about after dark piracy along the water
front than all the traffic tickets you can write.
Getting rocked by a wake or hearing a loud boat is a minor irritation compared
to waking up and finding your engine gone.
Other than that I imagine a boat cop is juat like being in the roller. You
spend most of your shift clearing radio calls.