BOTH INTERNATIONAL & INLAND You are on a 25-meter vessel at anchor. Which light(s) are you required to show?

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

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