What is typically the characteristic of a preferred channel buoy?

A preferred channel buoy is specifically designed to indicate the direction of the preferred channel that vessels should navigate to, and part of this identification may include its appearance and marking system. Often, these buoys are color-coded with one color being more prominent than the other to signify the preferred channel direction. The marking system may include numbers or letters, but characteristically, the lettered buoys are used to denote the direction from which the buoys were approached, which can help vessels determine which way to navigate in a tricky waterway.

While other options highlight relevant buoy functions, they do not accurately define the specific characteristics of a preferred channel buoy. For instance, navigational warnings or areas for anchoring pertain to different buoy types and purposes. Similarly, not all preferred channel buoys are lighted, as this feature is determined by local navigation rules and the specific waterway requirements. Thus, characteristic lettered markings for preferred channel buoys significantly contribute to their identification and function in maritime navigation.