Sound Signalling Device - Requirements - Short Blasts - Altering course
Unlike the sound signalling device, the sound signalling appliance is an integral part of the boat, is affixed to it and is in good working order. A sound signalling device can be a pealess safety whistle, a compressed gas horn, an electric horn, a gong or a bell. Whistles with a pea inside are not regulatory as they will not work with water in them.
Meeting situations sound signals
One short blast - I intend to change course to starboard.
Two short blasts - I intend to change course to port.
Three short blasts - I am operating astern propulsion (backing up).
Five or more short and rapid blasts - Danger or doubt signal (I don’t understand your intent).
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