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A boat is astern propulsion and is in the act of backing up
three short blast
Passing on your starboard (right) side.
I intend to pass you on the starboard(right) side
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.
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.
One long honk on the horn
3 blasts on the horn says you are going astern
3
A boat is using astern propulsion and is in the act of backing up.
you are altering your course to starboard