Question 46

The Correct Answer is D ### 2. Explanation for D ("All of the above") Option D is correct because the fog signal of **one prolonged blast followed by two short blasts** (— . .) is the specific signal designated in Rule 35(c) of both the International Regulations for Preventing Collisions at Sea (COLREGs) and the Inland Navigation Rules for a variety of vessels that are limited in maneuverability or are not power-driven. Since options A, B, and C all describe vessels that utilize this signal, D is the correct comprehensive answer. According to Rule 35(c), this signal must be sounded every two minutes by the following vessels when underway in or near an area of restricted visibility: * A vessel not under command (NUC). * A vessel restricted in its ability to maneuver (RAM). * A sailing vessel. * A fishing vessel. * A vessel engaged in towing or pushing (when attached). * A vessel constrained by draft (International only). **How the individual options fit:** * **A) A vessel restricted in its ability to maneuver:** A RAM vessel underway uses this signal (Rule 35(c)). Furthermore, Rule 35(g) allows a vessel at anchor that is restricted in its ability to maneuver or not under command to sound this signal in addition to the required anchor signal. * **B) A sailing vessel underway:** A sailing vessel is explicitly listed in Rule 35(c) as required to use this signal. * **C) A vessel not under command:** A vessel NUC is explicitly listed in Rule 35(c) as required to use this signal. ### 3. Explanation of why A, B, and C are individually incorrect (as the sole answer) Although vessels in options A, B, and C are all required to sound this specific fog signal, none of them is the *only* correct answer. The question asks which *vessels* are required to sound the signal, and since A, B, and C all correctly identify different types of vessels that use it, **D (All of the above)** is the only option that accurately encompasses the scope of the rule demonstrated by the choices.