Which type of buoy is always marked with red and even numbers?

The correct answer is that a nun buoy is always marked with red and even numbers. Nun buoys are typically used to indicate the right side of a channel as one approaches from the sea or upstream. This is part of the IALA (International Association of Lighthouse Authorities) buoyage system, which uses colors and shapes to help boaters navigate safely.

These buoys are conical in shape and display even numbers, which serve to enhance visibility and help mariners identify their position relative to navigable waters. The red color indicates to mariners that they are on the right side of the channel, reinforcing safe navigation.

In contrast, other buoy types serve different purposes and conform to different color coding and numbering standards. For instance, a can buoy is green and will display odd numbers, while a lighted buoy may have various colors and patterns depending on its function or location. A day mark, on the other hand, is a sign indicating a navigational aid and does not follow the red and even number convention. Understanding these distinctions is crucial for safe boating practices.