Three short blasts of a horn indicate that a boat is using sternpropulsion and is in the act of backing up.
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actually engine-room telegraph use- depending on circumstances-All Back Two Thirds ( ship is going into reverse) or if stationary,All Stop. sometimes transliterated as ( Shut her down) or cha chacha. It is used in this fashion in the song (Little Darling) whichmimics and engine- room telegraph.
It means literally, “change of status” as related to a ship”s orboat”s motion. For example, when beginning to get underway from apier, the ship will blast three short blasts when the command isissued to the engine room.
Rules of the Road.
Rule 34, Maneuvering & Warning Signal
International. “I am operating astern propulsion.”
It”s a salute upon leaving a port of call. “We”re underway!”
“I intend going astern”
∙ 4y ago
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