What do cylindrical-shaped buoys indicate in terms of color and numbering?

Cylindrical-shaped buoys, often referred to as can buoys, are critical in navigation as they help boaters identify safe channels and indicate direction. The standard for these buoys includes markings that are typically green in color and numbered with odd numbers. This system is part of the lateral buoyage system, which aids in navigation and helps boaters determine their position relative to safe passageways.

Green buoys indicate the port side of a channel when entering from open water, while can buoys, as cylindrical shapes are categorized, reinforce the idea of keeping this side on the left when navigating towards the harbor. The odd numbering is a crucial element of this system, as it helps inform boaters about the relative position of the buoy and what it signifies for navigation. Using this information accurately can prevent collisions and enhance safety on the water.

In contrast, the other options suggest different colors and markings that do not correspond to the officially recognized buoyage system, leading to potential confusion for navigators and increasing the risk in marine environments.