Question 28 RVR02 - Master of LT 500-1600 GRT

The Correct Answer is D **Explanation for Option D (Correct):** The shape shown in illustration D010RR (though not visible here, the context implies the universally recognized day signal for a vessel restricted in her ability to maneuver due to the size of her tow) is a black diamond shape displayed by a towing vessel. According to the International Regulations for Preventing Collisions at Sea (COLREGs), Rule 24(a)(i) and Rule 24(e), a power-driven vessel when towing or pushing ahead shall exhibit a diamond shape when the length of the tow (measured from the stern of the towing vessel to the after end of the tow) exceeds **200 meters**. This signal indicates the operational constraint caused by the exceptionally long tow. **Explanation for Other Options (Incorrect):** * **A) Has a tow that is carrying hazardous cargo:** There is no specific international day signal (like the diamond shape) prescribed solely to indicate that a tow is carrying hazardous cargo. Hazardous cargo is usually indicated by specific documents or markings relating to the cargo itself, not by a navigational day shape affecting the vessel's maneuvering status. * **B) Is at anchor:** A vessel at anchor displays a single black ball forward (Rule 30). The diamond shape is used to signify a long tow. * **C) Is not under command:** A vessel not under command (NUC) displays two black balls, one above the other (Rule 27(a)). A vessel towing a long tow is considered "restricted in her ability to maneuver" but is still "under command."