BOTH INTERNATIONAL & INLAND If you anchor your 25-meter vessel in a harbor, what light(s) must you show?

Correct Answer: Option A — One all-round white light

Rule 30(b) allows vessels of less than 50 meters in length to exhibit a single all-round white light where it can best be seen, instead of the two separate anchor lights (forward and aft) required for larger vessels under Rule 30(a).