Question 538 Rules of the Road

90% to pass

BOTH INTERNATIONAL & INLAND Which light(s) must a sailing vessel of over 20 meters in length while underway exhibit?

A stern light
B white masthead light
C red light over a green light at the masthead
D combined lantern
AI Explanation

The correct answer is A) stern light. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a sailing vessel over 20 meters in length while underway must exhibit a stern light. This is required by Rule 21(c) of the COLREGS, which states that a sailing vessel shall exhibit a stern light. The other options are incorrect as they do not fully meet the COLREGS requirements for a sailing vessel over 20 meters in length. For example, a white masthead light (option B) or a combined lantern (option D) would not be sufficient on its own.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG Navigation Center
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