Question 46 MODU01 - Offshore Installation Manager

The Correct Answer is D ### Explanation for why Option D ("All of the above") is correct: The fog signal of **one prolonged blast followed by two short blasts** is the required signal for a specific category of vessels that are either underway but unable to maneuver freely, or are at anchor but engaged in an operation that makes them restricted. This signal serves to alert nearby vessels that the vessel is not a standard power-driven vessel (which sounds one prolonged blast) and may require extra caution or space. According to both International (COLREGs Rule 35(c)) and Inland Rules (Rule 35(c) and 35(g)): 1. **A vessel not under command (NUC)** must sound this signal. (Covers Option C) 2. **A sailing vessel underway** must sound this signal. (Covers Option B) 3. **A vessel restricted in its ability to maneuver (RAM)** must sound this signal. This applies whether the RAM vessel is underway or, under Rule 35(g), if it is at **anchor** (in addition to the regular anchor signal). (Covers Option A) Since options A, B, and C are all required under the rules to sound one prolonged followed by two short blasts, **D (All of the above)** is the correct comprehensive answer. *** ### Explanation for why the other options are incorrect: While A, B, and C individually describe vessels that are required to sound the specified fog signal, they are incorrect as the final answer because the question asks which vessel**s** (plural) are required to sound it. Selecting any single option excludes the others, which are also legally required to sound the same signal. * **A) A vessel restricted in its ability to maneuver, at anchor:** This is required, but incomplete, as it excludes sailing vessels and vessels not under command. * **B) A sailing vessel underway:** This is required, but incomplete, as it excludes NUC vessels and RAM vessels. * **C) A vessel not under command:** This is required, but incomplete, as it excludes sailing vessels and RAM vessels.