Question 34 ONC05 - Master or Mate of LT 200 GRT

The Correct Answer is A **Explanation for A (Correct Option):** The illustration D010RR shows a vessel displaying a **diamond shape**. According to the International Regulations for Preventing Collisions at Sea (COLREGs), Rule 24 (Towing and Pushing), a power-driven vessel when towing a tow whose length exceeds 200 meters shall exhibit, in addition to the required masthead and sidelights, a **diamond shape** where it can best be seen. This signal indicates a long tow. **Explanation for B (Incorrect Option):** The shape displayed (diamond) signifies the length of the tow, not the nature of the cargo being carried. There are no specific day shapes prescribed by COLREGs solely to indicate hazardous cargo. **Explanation for C (Incorrect Option):** A vessel at anchor displays a **ball** shape (or two balls for vessels over 50 meters) during the day, not a diamond shape. **Explanation for D (Incorrect Option):** A vessel "not under command" (NUC) displays **two balls in a vertical line**, not a diamond shape. A tugboat displaying a diamond is actively engaged in towing operations and is under command, although restricted in its ability to maneuver by the tow.