overtaking light

The Oxford Companion to Ships and the Sea | 2006 | 484 words | Copyright

overtaking light, a white light displayed at the stern of a vessel under way at night, forming part of the compulsory navigation lights which a ship must display under the regulations laid down by the International Regulations for Preventing Collisions at Sea. The overtaking light, also known as a sternlight, must have a visibility of 3.2 kilometres (2 mls.) on a clear night and must show through an arc on either side of the vessel from right astern to two points abaft the beam.

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