Question 934 Rules of the Road

The correct answer is D) All of the above. According to the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules, vessels not under command, vessels restricted in their ability to maneuver, and sailing vessels underway are all required to sound a fog signal of one prolonged blast followed by two short blasts. This signal indicates the vessel's limited maneuverability or inability to give way to other vessels, alerting nearby vessels to take appropriate action. The other options are incorrect because they do not encompass all the vessel types that are required to sound this specific fog signal. The regulation applies to these three vessel types, both in international and inland waters.