What signals indicate a vessel is towing another vessel?

The signal indicating that a vessel is towing another vessel consists of two prolonged blasts followed by one short blast. This specific sound signal is part of the rules for sound signaling in restricted visibility outlined in the International Regulations for Preventing Collisions at Sea (COLREGs). The sequence of blasts helps other vessels understand the intentions and maneuvers of the towing vessel, thereby promoting safety and preventing collisions.

The first part of the signal, the two prolonged blasts, serves as a clear indication that the vessel is engaged in towing operations. The subsequent short blast conveys information about the vessel's maneuvering status. This method of sound signaling supports effective communication among mariners, especially in situations where visibility may be limited. Understanding these signals is crucial for safe navigation and ensuring that all operators are aware of the presence of a towing vessel and its tow.