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3 blasts on the horn says you are going astern
A boat is astern propulsion and is in the act of backing up
When backing up a boat, it's recommended to sound two short blasts of the horn to signal your intention to reverse. This communicates to others in the vicinity that you are maneuvering backward. Always ensure that you're aware of your surroundings and any other vessels in the area while backing up.
Three short blasts tell other boaters, “I am operating astern propulsion.” For some vessels, this tells other boaters, “I am backing up.”
A boat backing up typically uses a series of short blasts on its horn as a sound signal to alert others. This is often standardized as three short blasts, indicating that the vessel is about to back up. This warning helps nearby vessels and individuals to be aware of the boat's movements and to maintain a safe distance.
One long honk on the horn
three short blast
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.
Passing on your starboard (right) side.
When a boat is backing up, it typically uses a sound signal consisting of one prolonged blast followed by two short blasts on the horn. This signal alerts nearby vessels and individuals of the boat's maneuver, indicating that it is reversing. The use of sound signals is important for safety in busy waterways to prevent collisions.
A vessel that is backing up typically uses a series of short blasts on its horn to alert other boats of its intention to maneuver in reverse. This sound signal consists of three short blasts, which indicate that the vessel is preparing to move backward. This is part of the International Regulations for Preventing Collisions at Sea (COLREGs) to ensure safety on the water.
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.