Which type of buoy is lettered?

A preferred channel buoy is designed to indicate a preferred channel for navigation, showing boaters the best route to take when navigating a waterway. These buoys are often marked with letters to help identify the specific channel, making them distinct from other buoy types. The letters can relate to specific navigational information or local regulations, effectively communicating important information to boat operators.

On the other hand, the other types of buoys mentioned serve different purposes. Green can buoys typically indicate the port side of a channel when entering from the open sea. Red lighted buoys are usually used to mark the starboard side of a channel and often emit a light signal to enhance visibility at night. Green gong buoys serve a similar purpose to green can buoys but include sound signals to assist in navigation, particularly in low-visibility conditions. Each of these buoys has its distinct functions and markings that help with maritime navigation but do not typically use letters as part of their identification system.