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mast-head light, <of a vessel>
navigation light positioned above the longitudinal axis of a vessel, and designed to show a fixed white light forwards and to the sides of the vessel
Note 1 to entry: This entry was numbered 845-11-45 in IEC 60050-845:1987.
Note 2 to entry: This entry was numbered 17-757 in CIE S 017:2011.