BOTH INTERNATIONAL & INLAND What do the lights displayed in illustration D073RR indicate?

Correct Answer: Option A — vessel towing astern

Illustration D073RR shows the masthead lights and sidelights characteristic of a vessel towing astern. Rule 24(a) requires a power-driven vessel towing astern to exhibit two masthead lights in a vertical line if the length of the tow exceeds 200 meters, or three if the tow exceeds 200 meters.