(COLREGs) established in 1972 stipulates the requirements for navigation lights required on a vessel.

Basic lighting

Watercraft navigation lights must permit other vessels to determine the type and relative angle of a vessel, and thus decide if there is a danger of collision. In general, sailing vessels are required to carry a green light that shines from dead ahead to 2 points (22 1/2°) abaft the beam on the starboard

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