BOTH INTERNATIONAL & INLAND At night you sight a vessel displaying one green light. What is indicated by this light configuration?
Official USCG Answer & Rule Citation
Correct Answer: Option B — sailboat underway
Rule 25(c) allows a sailing vessel of less than 20 meters to combine its sidelights and sternlight into a single lantern carried at or near the top of the mast. A single green light indicates the starboard side of a sailing vessel, confirming it is underway and under sail.
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