What lights are shown by a vessel under towing?

A vessel under towing displays specific lights to indicate its status and ensure safe navigation. The correct lighting configuration for a towing vessel involves an alternating red and yellow light. The red light signifies the vessel's underway nature, while the yellow light indicates that it is engaged in towing operations. This combination helps other vessels recognize the towing situation, allowing them to take appropriate measures for safe passage.

The visibility of these distinct lights is crucial, especially in congested waterways where distinguishing between different types of vessels is essential for avoiding collisions. Thus, the alternating red and yellow lights serve not only as a warning to other vessels but also as a regulatory requirement under maritime navigation rules. Understanding these lighting patterns is vital for mariners to ensure safe navigation and compliance with the International Regulations for Preventing Collisions at Sea (COLREGs).