Question 32 OSV02 - Mate - Offshore Supply Vessels

The Correct Answer is A ### Explanation for Option A (not under command) A vessel **not under command (NUC)** is unable to maneuver as required by the Rules due to some exceptional circumstance (e.g., engine failure, damaged rudder). According to both the International and Inland Rules of the Road (Rule 27(a)), a vessel that is not under command must display the following signal lights: * **Two all-round red lights in a vertical line**, where they can best be seen. The illustration D084RR displays this specific configuration (two vertical all-round red lights), making the vessel immediately identifiable as not under command. *** ### Why the Other Options are Incorrect **B) showing improper lights** The vessel is displaying the internationally and legally recognized lights (two vertical all-round red lights) for a vessel Not Under Command (NUC). Therefore, the lights are proper for the condition the vessel is experiencing. **C) dredging** A vessel engaged in dredging is considered a vessel **restricted in its ability to maneuver (RAM)**. A RAM vessel displays three all-round lights in a vertical line: Red-White-Red (R-W-R). This is clearly different from the two vertical all-round red lights (R-R) shown in the illustration. **D) towing** A power-driven vessel engaged in towing displays two (or sometimes three) masthead lights in a vertical line (depending on the length of the tow), in addition to the standard sidelights and a special yellow towing light above the stern light. It does not use two vertical all-round red lights as its primary defining signal.