What sound signal is used when a vessel is towing another vessel?

• A. One prolonged, two short
• B. One short, two long
• C. Two prolonged, three short
• D. Three short

Answer: (A)

One prolonged blast followed by two short blasts signals that a vessel is towing another vessel. This pattern is used to inform nearby mariners in conditions of limited visibility or when signaling is needed to prevent collisions. The towing vessel uses this specific sequence to convey its status clearly, so others can anticipate the towing movement and give it extra room. If you hear that signal, slow down, maintain a safe distance, and pass with caution to accommodate the towing operation.