Question 995 Rules of the Road

The correct answer is A) One prolonged followed by three short blasts. This is the required fog signal for a manned vessel being towed at night, as per the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules. The prolonged blast followed by three short blasts indicates that the vessel is a towing vessel under way and may not be able to fully maneuver, which is an important signal for other vessels in restricted visibility. The other options are incorrect because they do not match the specific signal required for a towed vessel. Option B would be the signal for a vessel at anchor, Option C would be the signal for a vessel not under command, and Option D would be the signal for a vessel restricted in its ability to maneuver.