Question 34 OSV01 - Master/Chief Mate - Offshore Supply Vessels

The Correct Answer is A. A tugboat displaying the shape shown in illustration D010RR is indicating that it has a tow that exceeds 200 meters in length. The illustration depicts a shape consisting of a black diamond shape positioned vertically. According to the International Regulations for Preventing Collisions at Sea (COLREGS Rule 24(a)(i)), 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 must exhibit a diamond shape where it can best be seen. This signal is required under both international and inland rules. **Why Options B, C, and D are incorrect:** * **B) Has a tow that is carrying hazardous cargo:** There is no specific day shape defined in COLREGS or standard inland rules solely for a vessel towing hazardous cargo. * **C) Is at anchor:** A vessel at anchor displays a black ball (or two black balls if over 50 meters in length) where it can best be seen (COLREGS Rule 30). * **D) Is not under command:** A vessel not under command (NUC) displays two black balls in a vertical line where they can best be seen (COLREGS Rule 27(a)).