What sound signal is given when getting underway from a pier while the vessel is being towed?

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

Answer: (B)

In tow operations, sound signals convey the status of the vessels involved. When a vessel is being towed and begins to move away from a pier, the signal used is one long blast followed by three short blasts. This pattern clearly tells nearby vessels that the vessel is not under its own propulsion and is being towed as it gets underway, helping everyone nearby anticipate the tow’s movement in a busy harbor. The long blast grabs attention, and the three short blasts specify the tow status.