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lateral light
signal light used to indicate the course of a navigable waterway
Note 1 to entry: A preferred-channel light is a lateral light that is used to indicate a preferred course at a point where a choice of courses exists.
Note 2 to entry: This entry was numbered 845-11-41 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-643 in CIE S 017:2011.