A towing vessel must exhibit lights to indicate its action. What must it display?

A towing vessel must exhibit specific lights to ensure its actions are clearly communicated to other vessels during both day and night. When engaged in towing, the requirements dictate that it display two masthead lights in a vertical line, along with a stern light.

The two masthead lights signal to other vessels that the towing vessel is engaged in such operations, particularly alerting other mariners of the vessel's length and activity. The stern light serves to maintain visibility of the vessel's position from the rear. This lighting configuration is crucial for safety on the water, as it prevents misunderstandings about the vessel’s intentions or movements, which is essential in maintaining navigational safety.