I suspect if anyone lit off a horn when entering or leaving the breakwater entrances around our marina they would be run out of town on a rail. Or on a plank, I guess, since it's a marina. In the 13 years we've been in our marina we are aware of exactly one boat that did this regularly until the port office politely told him they'd gotten so many complaints from other boaters that they would appreciate it if he never did it again. And he hasn't.
Our dual horns are loud enough to wake the dead but the only time we ever use them (outside of a test once or twice a year well away from anyone else) is in fog.
Our dual horns are loud enough to wake the dead but the only time we ever use them (outside of a test once or twice a year well away from anyone else) is in fog.