Question 31

The Correct Answer is C A vessel displaying the shape shown in illustration D010RR (a black diamond shape) is indicating that **it is restricted in its ability to maneuver due to the nature of its work, specifically having a tow that exceeds 200 meters in length**. According to the International Regulations for Preventing Collisions at Sea (COLREGS) Rule 24 (Towing and pushing), a vessel restricted in its ability to maneuver due to towing operations that involve a tow exceeding 200 meters in length must exhibit a black diamond shape where it can best be seen. **Why the other options are incorrect:** A) **Is at anchor:** A vessel at anchor displays one black ball (or two black balls if exceeding 50 meters in length). A diamond shape is not used for anchoring. B) **Is not under command:** A vessel not under command displays two black balls, one vertically over the other, where they can best be seen. A diamond shape is incorrect for this situation. D) **Has a tow that is carrying hazardous cargo:** While vessels carrying hazardous cargo may have additional marking requirements (such as placards), the display of a black diamond shape specifically relates to the *length* of the tow (exceeding 200 meters), not the nature of the cargo being towed.