Question 955 Rules of the Road

The correct answer is D) A vessel being towed. The whistle signal of one prolonged blast followed by two short blasts indicates a vessel not under command, a vessel restricted in its ability to maneuver, or a vessel engaged in fishing with trawls. However, this signal does not apply to a vessel being towed, as the towed vessel would not be making its own whistle signals. Instead, the towing vessel would be responsible for making the appropriate signals to indicate the presence of the tow. The other answer choices (A, B, and C) are all vessel types that would appropriately use the one prolonged blast followed by two short blasts signal, but a vessel being towed would not make this signal itself.