Question 31

The Correct Answer is C **Explanation of Option C (Correct Answer):** The illustration D010RR (which displays shapes used in compliance with the International Regulations for Preventing Collisions at Sea - COLREGs) shows a **diamond shape**. According to Rule 24 (Towing and Pushing) of COLREGs, a vessel engaged in towing where the length of the tow measured from the stern of the towing vessel to the after end of the tow exceeds 200 meters shall display: * Three masthead lights in a vertical line (by night); and * A **diamond shape** where it can best be seen (by day). Therefore, a vessel displaying a diamond shape indicates that it has a tow that exceeds 200 meters in length. **Explanation of Why Other Options Are Incorrect:** * **A) Is at anchor:** A vessel at anchor displays a black ball (by day) and specific anchor lights (by night), not a diamond shape. * **B) Is not under command:** A vessel not under command (NUC) displays two black balls in a vertical line (by day) and two all-round red lights in a vertical line (by night), not a diamond shape. * **D) Has a tow that is carrying hazardous cargo:** While vessels carrying dangerous or hazardous cargo may have additional marking requirements related to the cargo itself (e.g., specific placards or signals under different regulations), the display of a diamond shape specifically denotes the **length** of the tow, not the nature of the cargo being carried. COLREGs uses the diamond shape solely to indicate a long tow.