BOTH INTERNATIONAL & INLAND Which vessel must exhibit forward and after masthead lights when underway?

Correct Answer: Option B — A 50-meter power-driven vessel

Rule 23(a)(ii) requires a power-driven vessel of 50 meters or more in length to exhibit a second masthead light abaft of and higher than the forward one. Vessels under 50 meters are only required to carry one masthead light, though they may carry a second one.