Question 4 RVR02 - Master of LT 500-1600 GRT

The Correct Answer is C **Why option C ("a vessel towing a tow more than 200 meters astern") is correct:** The scenario describes a vessel that is seen end-on (showing red and green sidelights) and has a specific arrangement of three white lights vertically stacked above the sidelights. According to the International Regulations for Preventing Collisions at Sea (COLREGs), Rule 24 (Towing and Pushing), a power-driven vessel when towing shall exhibit: 1. **Sidelights (Red and Green):** These indicate the vessel is seen end-on. 2. **Masthead Lights (Two or Three):** * If the length of the tow (measured from the stern of the towing vessel to the after end of the tow) does not exceed 200 meters, the vessel shows two masthead lights in a vertical line. * **If the length of the tow exceeds 200 meters, the vessel must show three masthead lights in a vertical line.** 3. **Stern Light:** (Not mentioned, but required). 4. **Towing Light (Yellow):** Shown above the stern light (Not mentioned, but required). The visibility of three white lights in a vertical line above the level of the sidelights is the specific identifying characteristic for a vessel that is towing a tow exceeding 200 meters in length. **Why the other options are incorrect:** * **A) a vessel not under command (NUC):** A vessel NUC exhibits two all-round red lights in a vertical line (and sidelights/stern light if underway), not three white lights. * **B) a vessel trawling:** A vessel engaged in fishing (trawling) exhibits two all-round lights in a vertical line: green over white (and sidelights/stern light if underway). * **D) a vessel underway and dredging:** A vessel constrained by its draft (CBD) shows three all-round red lights in a vertical line. A vessel engaged in dredging (a type of restricted maneuverability) shows three all-round lights: red-white-red in a vertical line (and masthead lights/sidelights/stern light if underway). If required to indicate the obstruction/side to pass, they may show two all-round red lights (obstruction side) and two all-round green lights (passing side), but never three white lights in a vertical line as the primary identifying signal.