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

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

Rule 30(a) of both International and Inland Rules requires a vessel at anchor to exhibit an all-round white light where it can best be seen. For a vessel less than 50 meters in length, a single all-round white light is sufficient to satisfy the anchor light requirement.