Question 32 MODU02 - Barge Supervisor

The Correct Answer is A. ### Explanation for Option A (Correct Answer: not under command) **Option A (not under command)** is correct because the illustration D084RR depicts a vessel showing **two all-round red lights displayed vertically.** According to the International Regulations for Preventing Collisions at Sea (COLREGs) Rule 27(b) and the Inland Rules equivalent: * A vessel **not under command (NUC)**, which through some exceptional circumstance is unable to maneuver as required by the Rules, is required to exhibit **two all-round red lights in a vertical line** where they can best be seen. Therefore, the lights shown clearly identify the vessel as being Not Under Command. *** ### Explanation of Incorrect Options **Option B (showing improper lights):** This is incorrect. The vessel is displaying the internationally recognized and regulated lights for a vessel Not Under Command (two vertical all-round red lights). These are proper and required lights for this specific situation. **Option C (dredging):** This is incorrect. A vessel engaged in dredging (or underwater operations) is typically classified as a vessel **restricted in her ability to maneuver (RAM)**. While a RAM vessel shows two vertical all-round lights (Red, White, Red), a vessel actually engaged in dredging operations (when obstructing a channel) must also show two vertical all-round red lights (obstruction side) and two vertical all-round green lights (passing side), in addition to the masthead/sidelights/sternlight if underway. The illustration only shows two vertical all-round red lights, which specifically denotes NUC, not the complex arrangement required for dredging/RAM. **Option D (towing):** This is incorrect. A power-driven vessel engaged in towing exhibits different lights. It shows two (or sometimes three) **masthead lights in a vertical line** (depending on the length of the tow), in addition to sidelights and a sternlight. It also shows a towing light (a yellow light above the sternlight). It does **not** show two vertical all-round red lights.