Definition
A sailing vessel of less than 20 metres may combine her red, green and white lights in one lantern carried at or near the top of the mast, keeping the standard arcs of 112.5, 112.5 and 135 degrees. Height gives excellent range offshore for very little current draw. It must never be shown together with deck-level sidelights, nor when the engine is driving the boat, and it is less useful inshore against shore lighting.
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