A vessel being towed at night must show what?

A vessel being towed at night must display sidelights and a sternlight to comply with navigation rules. Sidelights are vertical lights that show green on the starboard side and red on the port side, ensuring that other vessels can identify the vessel’s orientation and direction of travel. The sternlight, located on the stern, emits white light and helps indicate the presence of the towed vessel to vessels approaching from behind.

This combination of lights is crucial for ensuring that the vessel being towed is clearly visible and identifiable to other mariners, enhancing safety during nighttime operations. While other options mention different lighting configurations or signals, none meet the specific requirements outlined by the Rules of the Road for a vessel under tow.