BOTH INTERNATIONAL & INLAND A towing vessel 35 meters in length, with a tow 100 meters astern, must show a minimum of how many masthead lights?

Correct Answer: Option B — 2

Rule 24(a) requires a power-driven vessel towing to exhibit two masthead lights in a vertical line when the length of the tow, measured from the stern of the towing vessel to the after end of the tow, exceeds 200 meters. Since this tow is 100 meters, only one masthead light is required.