Question 32

The Correct Answer is A. ### Why Option A ("not under command") is Correct The vessel shown in illustration D084RR is displaying **two all-round red lights** positioned vertically one over the other. According to Rule 27(b) of the International Regulations for Preventing Collision at Sea (COLREGs) and the equivalent Inland Rules, a vessel that is **not under command (NUC)** exhibits this specific signal: two all-round red lights in a vertical line where they can best be seen. A vessel NUC is unable to maneuver as required by the rules and is therefore signaling its disability. --- ### Why Other Options Are Incorrect **B) showing improper lights:** The lights shown (two vertical all-round reds) are proper and specifically prescribed by the rules for a vessel NUC. If the vessel were actually NUC, these lights would be correct, not improper. **C) dredging:** A vessel engaged in dredging (or underwater operations) exhibits different signals: * Three all-round lights in a vertical line: Red-White-Red. * In addition, it shows two all-round green lights in a vertical line to indicate the side on which an obstructing apparatus exists, and two all-round red lights in a vertical line on the side on which a vessel may pass. The signal shown (two all-round reds only) is not the primary or complete signal for dredging. **D) towing:** A vessel engaged in towing shows standard masthead lights (either one or two, depending on the length of the tow), sidelights, and a sternlight. * If the tow is less than 200 meters, it shows two masthead lights in a vertical line. * If the tow is 200 meters or more, it shows three masthead lights in a vertical line. Crucially, it **does not** show two all-round red lights. The all-round red lights signify distress or inability to maneuver, not routine towing operations.