Question 32 MODU01 - Offshore Installation Manager

The Correct Answer is A. ### Explanation for Option A (Correct Answer) Option A, **not under command (NUC)**, is correct because the illustration D084RR (which depicts the lights visible from the bow/front) shows two all-around red lights displayed vertically where the masthead light(s) would typically be, and also shows sidelights (red on the port side, green on the starboard side). According to both the International Regulations for Preventing Collision at Sea (COLREGS Rule 27(a)) and Inland Rules: * A vessel **not under command** shall exhibit **two all-around red lights in a vertical line** where they can best be seen. * If making way through the water (as suggested by the presence of sidelights), it must also display sidelights and a stern light (though the stern light is not visible from the bow view). The arrangement of two all-around red lights, indicating operational disability, combined with sidelights, confirms the vessel is underway but unable to maneuver as required by the rules (NUC). ### Explanation for Incorrect Options **B) showing improper lights:** While this vessel is exhibiting specific lights that indicate its status, the configuration shown (two all-around red lights + sidelights) is the **proper and mandated signal** for a vessel NUC making way. Therefore, the lights are not improper; they are correct for the defined situation. **C) dredging:** A vessel engaged in **dredging** (or underwater operations) is restricted in its ability to maneuver. A vessel restricted in its ability to maneuver (RAM) typically exhibits three all-around lights in a vertical line: Red-White-Red. It would also display a masthead light, sidelights, and stern light if underway. If the vessel is also obstructing a channel, it displays two all-around red lights on the side of the obstruction and two all-around green lights on the side safe for passage. The display of only two all-around red lights is insufficient and incorrect for the primary RAM signal (R-W-R) or the obstruction signal. **D) towing:** A vessel engaged in **towing** (where the length of the tow is less than 200 meters) exhibits two masthead lights in a vertical line, plus sidelights and a stern light. If the tow length exceeds 200 meters, three masthead lights are shown vertically. The two all-around red lights shown in the illustration are the primary characteristic of NUC, not towing.