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COLREGs · Rule 23

Power-driven Vessel Underway

TL;DR

A masthead light forward, a second masthead light abaft and higher (if 50 m+), sidelights, and a sternlight. Vessels under 12 m may show an all-round white in lieu of masthead+stern.

Authoritative source

Inland parallel

Inland Rule 23Power-driven Vessel Underway

More from Part C — Lights and Shapes

Related drills

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COLREGs Rule 23: Power-driven Vessel Underway — Captain's Exam Prep · CaptainsGround