Question 32 GLI05 - Master or Mate of LT 200 GRT

The Correct Answer is A ### Explanation for Option A (not under command) A vessel **not under command (NUC)** is defined by Rule 27(a) of the COLREGs (International Regulations for Preventing Collisions at Sea). A vessel exhibiting two all-round red lights in a vertical line is displaying the required signal for a vessel that, due to exceptional circumstances, is unable to maneuver as required by the Rules (i.e., engine failure, broken rudder, etc.). The lights shown in D084RR (two vertical all-round red lights) are the universally recognized symbol for NUC. --- ### Explanations for Incorrect Options **B) showing improper lights** The display of two vertical all-round red lights is a standard, prescribed signal under the COLREGs (Rule 27). Since it accurately depicts the NUC status, it is a proper use of navigational lights, making this option incorrect. **C) dredging** A vessel engaged in dredging or underwater operations must display the signals for a vessel restricted in its ability to maneuver (three vertical lights: Red-White-Red). Furthermore, Rule 27(d) requires that it must show two all-round red lights on the side where the obstruction exists (the side of danger) and two all-round green lights on the side on which another vessel may pass (the safe side). The illustration D084RR only shows two vertical red lights, which is insufficient and incomplete for a vessel dredging. **D) towing** A vessel engaged in towing (Rule 24) must display two or three masthead lights in a vertical line (depending on the length of the tow) and a yellow towing light above the sternlight. It does not use the two vertical all-round red lights signal shown here.