What does a green, can-shaped buoy mark?

A green, can-shaped buoy is used in navigational systems to indicate the edges of channels. Specifically, it marks the port (left) side of the channel when a boater is traveling upstream. This is an essential aspect of the "IALA" (International Association of Lighthouse Authorities) buoyage system, which provides uniformity in marking navigational routes.

When navigating, understanding the buoy system is crucial for safe passage through waterways. By identifying this green buoy on the left side, boaters can confidently ascertain that they are within the safe navigable area of the channel, while the right side would be marked by a red, cone-shaped buoy. This coloring and shape scheme helps prevent collisions with obstacles and ensures that boaters can easily determine their safe path.

Understanding how buoys signal channel edges is key for maintaining clear and safe navigation, especially in crowded or complex waterways. The other options do not represent the standard meaning of a green can buoy within the established navigation system.