Question 46 OSV01 - Master/Chief Mate - Offshore Supply Vessels

The Correct Answer is D Option D ("All of the above") is correct because the fog signal of **one prolonged followed by two short blasts** is mandated for a specific category of vessels that are considered "handicapped" or limited in maneuverability, whether they are underway or anchored. This signal is required by both the International Regulations for Preventing Collisions at Sea (COLREGS Rule 35(c)) and the Inland Rules (Rule 35(c)). Specifically, this signal is required for: * A vessel restricted in her ability to maneuver (including when performing work or anchored while working). (Option A) * A vessel not under command. (Option C) * A vessel constrained by her draft (International only, but falls under the general category). * A fishing vessel (when fishing). * A towing or pushing vessel (when restricted in its ability to deviate from course). Since Options A (Vessel restricted in its ability to maneuver, at anchor) and C (Vessel not under command) are both included in the list of vessels that *must* sound this signal, and Option B (A sailing vessel underway) sounds the same signal under certain circumstances (see below), selecting D is the only accurate choice that encompasses the scope of vessels sounding this specific sequence. *** **Explanation of why other options are insufficient (not necessarily "incorrect" in terms of rule interpretation, but incomplete as the final answer):** * **A) A vessel restricted in its ability to maneuver, at anchor:** This vessel *is* required to sound this signal (one prolonged and two short blasts). However, choosing only A would ignore the other vessels required to sound the same signal (like C). * **B) A sailing vessel underway:** This vessel is required to sound a fog signal of **one prolonged followed by two short blasts** (COLREGS Rule 35(c)). It is categorized alongside vessels not under command and restricted in its ability to maneuver. Therefore, B is also a vessel that sounds this signal. * **C) A vessel not under command:** This vessel *is* required to sound this signal (one prolonged and two short blasts). However, choosing only C would ignore the other vessels required to sound the same signal (like A and B). Since A, B, and C are all vessels required to sound the signal "one prolonged followed by two short blasts," **D (All of the above)** is the necessary and correct answer.