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PA Boating Handbook
Sound Signals
Sound signals should be made when within hearing distance of another vessel to indicate your intentions when meeting, crossing or overtaking them. Your signal should receive a response signal from the other vessel indicating their agreement or disagreement with your intentions.
Short Blast- one-second duration   Prolonged Blast- 4 to 6 seconds duration

Horn1 Short Blast- I intend to leave you on my port side (boat turns right).
2 Short Blasts- I intend to leave you on my starboard side (boat turns left).
3 Short Blasts- I am operating in reverse (astern propulsion).
5 or More Short Blasts- Doubt or danger (danger signal used when the other vessel’s intentions are not understood or where the other vessel’s indicated course is dangerous).

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