Question 46

The Correct Answer is D ### 2. Explanation of why option D ("All of the above") is correct The fog signal of "one prolonged blast followed by two short blasts" is defined in the International Regulations for Preventing Collisions at Sea (COLREGs), Rule 35(c). This signal is used by specific vessels that are either non-power-driven or have limitations on their ability to maneuver quickly. Rule 35(c) states that the following vessels shall sound this signal at intervals of not more than two minutes: * A vessel restricted in its ability to maneuver (RAM) * A vessel not under command (NUC) * A vessel constrained by its draught * A sailing vessel * A vessel engaged in fishing * A vessel engaged in towing or pushing Since all the vessels listed in options A, B, and C fall into these categories, they are all required to sound this specific fog signal: * **A) A vessel restricted in its ability to maneuver:** This vessel type is explicitly listed in Rule 35(c). (Note: Rule 35(e) allows a RAM vessel at anchor to use this signal instead of the standard anchor signal if they deem it necessary to indicate their inability to move.) * **B) A sailing vessel underway:** This vessel type is explicitly listed in Rule 35(c). * **C) A vessel not under command (NUC):** This vessel type is explicitly listed in Rule 35(c). Because A, B, and C are all required to sound this signal, "All of the above" is the correct answer. ### 3. Explanation of why each of the other options is incorrect Options A, B, and C are all individually incorrect because, while the vessel listed in each option *is* required to sound the signal, selecting any single option fails to account for the other vessels in the list that also must sound the same signal. * **A) A vessel restricted in its ability to maneuver, at anchor:** Incorrect, because a sailing vessel underway (B) and a vessel not under command (C) are also required to sound the signal. * **B) A sailing vessel underway:** Incorrect, because a vessel restricted in its ability to maneuver (A) and a vessel not under command (C) are also required to sound the signal. * **C) A vessel not under command:** Incorrect, because a vessel restricted in its ability to maneuver (A) and a sailing vessel underway (B) are also required to sound the signal.