Question 939 Rules of the Road

The correct answer is B) One prolonged blast. According to the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules, a vessel underway and making way in fog shall sound one prolonged blast every two minutes. This signal is used to indicate the presence and location of the vessel to other ships in the vicinity, helping to prevent collisions in low visibility conditions. The other answer choices are incorrect because they do not match the specific signal required by the regulations for a vessel underway and making way in fog. Three distinct blasts, two prolonged blasts, and one prolonged blast followed by three short blasts are used for different situations, such as a vessel not under command or a vessel at anchor.