What type of buoy marks the edge of the channel on the right side while heading upstream?

Cone-shaped buoys are specifically designed to indicate the edge of the channel on the right side when a boat is moving upstream. This is part of a standardized system known as the lateral navigation marking system, used to guide boaters safely through channels and avoid hazards. The cone-shaped buoy, which typically has a color scheme of green and a pointed top, serves as a visual aid, signifying to navigators that they are on the correct side of the channel according to the established rules. This assists in maintaining the safe passage of vessels by clearly marking navigable waters.

In contrast, cylindrical-shaped and square-shaped buoys do not have the same meaning or function in the navigation system and are not used to mark channel edges in the same manner. Therefore, cone-shaped buoys play a crucial role in helping boaters understand their position relative to navigational hazards and ensuring safety on the water.