Boats and Watercraft
Large Ships

What does 3 short blast of the horn mean?


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International and Inland Navigational rules. Sound and Light Signals.

Rule 34

Maneuvering Signals(a) When vessels are in sight of one another, a power driven vessel underway, when maneuvering as authorized or required by these Rules, shall indicate than maneuver by the following signals on her whistle: -Three short blasts to mean "I am operating astern propulsion".