Which statement correctly describes a Nun buoy?

• A. Red, even numbers
• B. Green, odd numbers
• C. Red, odd numbers
• D. Green, even numbers

Answer: (A)

Nun buoys are red and cone-shaped markers in the IALA buoyage system. They use even numbers to distinguish them from Can buoys, which are green and cylindrical and carry odd numbers. So the statement “red, even numbers” correctly describes a Nun buoy. If you see a green, cylindrical buoy with an odd number, that’s a Can buoy. In practice, recognizing the shape first (cone versus cylinder) and color helps you identify the buoy type quickly, with the number confirming it when visibility allows.