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A boat is astern propulsion and is in the act of backing up
three short blast
3 short blasts
Three short blasts tell other boaters, “I am operating astern propulsion.” For some vessels, this tells other boaters, “I am backing up.”
Three short blasts means you are operating in reverse. One prolonged blast followed by 3 short blasts means boat under tow in redcued visibility conditions.
Three short blasts means that the ship's engine is working in reverse.
3 short blasts
3 short blasts
3 short blasts
passing on the port side from behind
When two boats approach each other, they use horn blasts to signal the other about their intentions when it comes to moving to avoid collision. 5 short blasts indicates that the signaling boat is unsure about what the other boat is doing.
3 short blasts