Question 573 Rules of the Road

90% to pass

BOTH INTERNATIONAL & INLAND When anchoring a 20-meter vessel at night, which light(s) must you show?

A one all-round white light
B one all-round white light and the stern light
C one all-round white light and a flare up light
D two all-round white lights
AI Explanation

The correct answer is A) one all-round white light. According to the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules, a vessel at anchor must display an all-round white light where it can best be seen. This is the required lighting configuration for a 20-meter vessel at anchor, both in international and inland waters. The other options are incorrect because: B) displaying a stern light in addition to the all-round white light is not required for a vessel at anchor; C) a flare-up light is not a required light for a vessel at anchor; and D) displaying two all-round white lights is not the correct configuration for a 20-meter vessel at anchor.

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