Question 32 GLI01 - Master-Unlimited Tonnage

The Correct Answer is A. ### Why Option A ("not under command") is Correct Option A, **not under command**, is correct because the illustration (D084RR, which depicts the lights shown) displays two all-round red lights arranged vertically. According to both the International Regulations for Preventing Collisions at Sea (COLREGs) Rule 27(a) and the Inland Rules (33 CFR § 83.27(a)), a vessel that is **not under command (NUC)**—meaning she is unable to maneuver as required by the rules due to some exceptional circumstance—must exhibit: 1. **Two all-round red lights** in a vertical line where they can best be seen. (These are the distinctive lights shown). 2. When making way, sidelights and a stern light. 3. When at anchor, the NUC lights take the place of the anchor lights. The two vertical all-round red lights are the definitive signal for a vessel not under command. ### Why Other Options Are Incorrect **B) showing improper lights:** This option is incorrect because the lights shown (two vertical all-round red lights) are prescribed signals for a specific status (not under command). Therefore, if the vessel is indeed not under command, the lights are proper. **C) dredging:** This option is incorrect. A vessel engaged in dredging or underwater operations (Rule 27(d)) exhibits different lights: * Two vertical all-round red lights to show the side on which the obstruction exists (where other vessels must not pass). * Two vertical all-round green lights to show the side on which another vessel may pass. The illustration only shows two vertical all-round red lights, which is the complete signal for NUC, not the partial signal for dredging (unless combined with the green lights). **D) towing:** This option is incorrect. A power-driven vessel engaged in towing (Rule 24) exhibits: * Two or three masthead lights in a vertical line (depending on the length of the tow). * Sidelights and a stern light. * A towing light above the stern light. It does not use two vertical all-round red lights as its primary defining signal.