Question 32 GLI06 - Master or Mate of LT 100 GRT

The Correct Answer is A. ### Why Option A ("not under command") is Correct The vessel shown in illustration D084RR is exhibiting the following lights: 1. **Two all-round red lights displayed vertically.** According to both the International and Inland Rules of the Road (33 CFR Part 83, Rule 27(a)), a vessel that is **not under command (NUC)** must display two all-round red lights in a vertical line where they can best be seen. This combination of lights uniquely identifies a vessel that, through some exceptional circumstance, is unable to maneuver as required by the Rules and is therefore unable to keep out of the way of another vessel. ### Why the Other Options are Incorrect **B) showing improper lights:** While technically any non-standard light display could be considered improper, the lights shown (two vertical all-round red lights) are a specific, mandated signal defined by the Rules. Since the vessel is displaying the correct signal for a "not under command" status, the lights themselves are proper for that specific situation. **C) dredging:** A vessel engaged in dredging or underwater operations (when restricted in its ability to maneuver) is required to display: * Three all-round lights in a vertical line: Red-White-Red. * Two all-round red lights (or day shapes) to indicate the side obstructed. * Two all-round green lights (or day shapes) to indicate the side safe for passage. The illustration only shows two vertical red lights, which is not the signal for dredging. **D) towing:** A power-driven vessel that is towing displays a masthead light (or lights, depending on the length of the tow) and a stern light. When towing, a vessel must show two masthead lights in a vertical line instead of one, and if the length of the tow exceeds 200 meters, it must show three masthead lights. It would also display the appropriate sidelights. The illustration's display of two vertical all-round red lights is not the signal for towing.