INTERNATIONAL ONLY Which light(s) will a 20-meter power-driven vessel pushing ahead or towing alongside display?

Correct Answer: Option D — Two masthead lights in a vertical line

Rule 24(c) mandates that a power-driven vessel pushing ahead or towing alongside must display two masthead lights in a vertical line. This configuration identifies the vessel as engaged in towing, distinguishing it from a standard power-driven vessel that typically displays only one masthead light.