A tri-colour or tri-light is a navigation light situated at the top of a mast on a sailing boat. The only reason for having one onboard is to save battery power while sailing at night; having only one bulb to show all 3 navigation lights. A tri-colour cannot be used with any other lights.
By SailingQuiz November 2019 Category: Sailing Terms
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Definition of the nautical phrase "Tri-colour".
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