What sound signal indicates a towed vessel is making way?

A towed vessel that is making way is indicated by one long blast of sound signal. This signal is recognized internationally and serves as a way for other vessels to understand the status of the towed vessel. A long blast is typically used to signify the vessel's presence and its movement through the water, ensuring that other operators are aware of its operational status.

This understanding is critical in navigation and safety at sea, as it helps prevent collisions and promotes effective communication between vessels. The use of sound signals, such as a long blast, is part of the International Regulations for Preventing Collisions at Sea (COLREGs), which standardizes these signals globally to ensure clarity in maritime communication.