There's a good reason for that, as three short horn blasts is the signal that a ship is operating in astern propulsion. If you're not familiar with nautical terms, "astern propulsion" essentially ...

DULUTH — Have you ever noticed that not all ships entering, or leaving, the Duluth Harbor use the same horn signal? I'll confess that I hadn't. Fortunately, the News Tribune has a reader with ...

said many people looked forward to the area's cruise ship season. She said: "Some have a musical horn and a funky tune. It is a signal to say 'hello' or 'goodbye'." The port authority said it ...