Deck General (Supplementary) USCG Q#180 (Set 4)

BOTH INTERNATIONAL & INLAND What light configuration may a sailing vessel underway exhibit?

Official USCG Answer & Rule Citation

Correct Answer: Option C — a red light over a green light at the masthead

COLREG Rule 25(b) allows a sailing vessel underway to exhibit optional masthead lights consisting of a red light over a green light in a vertical line at or near the top of the mast, visible only when sidelights and sternlight are combined.

All Deck General (Supplementary) Sets Practice Set 4