Which buoy shape indicates the left-hand side of a channel when approaching from the sea?

The can shape buoy indicates the left-hand side of a channel when approaching from the sea. This signaling system is part of the IALA (International Association of Lighthouse Authorities) buoyage system, which aids mariners in navigation. Specifically, in the IALA Region A, which covers most of the world including the United States, a can buoy, which is often colored black and marked with a reflective horizontal band, is used to mark the starboard (right) side of the channel for vessels coming from open water. Consequently, by convention, when approaching the harbor or channel, the can shape signifies that the left side should be kept on the left. Understanding these buoy shapes is essential for safe navigation, ensuring that vessels do not stray into shallow waters or obstructions. Each buoy shape conveys critical information to navigators, which is why knowing the shapes and their meanings is fundamental for all boaters.