Question 34 GLI02 - Mate of Unlimited Tonnage

The Correct Answer is A. A tugboat displaying the shape shown in illustration D010RR (a black diamond shape) is indicating that **it has a tow that exceeds 200 meters in length**. This signal is mandated by both the International Regulations for Preventing Collisions at Sea (COLREGs) Rule 24 (Towing and Pushing), which requires a vessel or composite unit engaged in towing or pushing operations where the length of the tow exceeds 200 meters to exhibit a diamond shape where it can best be seen. **Why the other options are incorrect:** * **B) Has a tow that is carrying hazardous cargo:** There is no specific international signal (day shape) consisting solely of a black diamond used to indicate a tow carrying hazardous cargo. Vessels constrained by their draft sometimes use a black cylinder, but this relates to the vessel itself, not the tow's cargo. * **C) Is at anchor:** A vessel at anchor displays one or two black ball shapes, depending on its length (Rule 30). * **D) Is not under command:** A vessel not under command displays two black balls in a vertical line (Rule 27).