What is the last buoy in the area of responsibility (AOR)?

The last buoy in the area of responsibility (AOR) is identified as Green Can 21, which serves a significant navigational purpose. In the IALA buoyage system, can buoys are typically colored green and are used to indicate the starboard side of a channel when entering from the sea. The number 21 signifies its position relative to other navigational aids within the AOR, indicating that it is designated for vessels navigating this specific channel.

Understanding the AOR is vital for boat crews, as it helps determine where the responsibilities for markings and maintenance of navigational aids lie. Knowing the last buoy in this region helps crew members assess their location and navigate safely. Hence, it is essential for safety operations and efficient navigation in coastal waters.

The other choices represent various types of buoys that serve different purposes (red nun buoys typically indicate the port side, yellow buoys may signify special marks like navigational hazards, and white buoys might indicate safe water or isolated dangers), but they are not the last buoy signifying the end of the AOR in this context.