BOTH INTERNATIONAL & INLAND A towing vessel is towing two barges astern. The length of the tow from the stern of the tug to the stern of the last barge is 250 meters. The towing vessel is 45 meters in length. How many white masthead lights should be displayed on the tugboat at night?

Correct Answer: Option C — 3

Rule 24(a) requires a power-driven vessel towing to display two masthead lights in a vertical line when the length of the tow exceeds 200 meters. A third masthead light is required if the length of the tow exceeds 200 meters, measured from the stern of the towing vessel to the stern of the tow.