What determines if a vessel is officially recognized as a towing vessel?

A vessel is officially recognized as a towing vessel, particularly under the COLREGs (International Regulations for Preventing Collisions at Sea), by the use of a yellow stern light. This light is a key indicator that signifies the operation of the vessel in towing capacity. When a towing vessel has a yellow stern light shown, it is providing a visual acknowledgment to other vessels regarding its towing activity. This is important for maintaining safe navigation and ensuring that other vessels are aware of the towing operations taking place.

Colors and configurations of lights used on vessels are designed to convey specific information about their function and operational status. The yellow stern light helps to distinguish towing vessels from others, thereby promoting safe maneuvers in maritime traffic. It's crucial for nearby vessels to recognize this signal to appropriately react to the presence of a towing operation and ensure safe distances are maintained, avoiding potential collisions.