All vessels
Rule Reference
Rule 24(a): instead of the Rule 23(a)(i) or (a)(ii) light, two masthead lights in a vertical line — three when the tow exceeds 200 m; sidelights; a sternlight; a towing light above the sternlight; when the tow exceeds 200 m, a diamond shape where best seen.
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Tap any light dot to see its COLREGS sector and rule.
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