What type of light must a vessel engaged in towing at night display?

A vessel engaged in towing at night is required to display a towing light in addition to a stern light. The towing light is an all-round white light that signifies the vessel's towing operation, while the stern light indicates the rear of the vessel. This combination of lights ensures that other vessels can easily identify the towing vessel and its operation from a distance, adhering to the navigation rules that enhance safety on the water.

The requirement for a towing light is essential because it provides specific identification of a vessel that is maneuvering differently than a standard vessel. The inclusion of the stern light serves to mark the location of the vessel, preventing potential collisions. By using both lights correctly, the towing vessel improves visibility and helps maintain proper navigation standards for all vessels in the area.