In maritime navigation, what is the function of a red buoy?

A red buoy serves a specific function in maritime navigation related to indicating the port side when entering a harbor or navigating in channels. According to the "IALA Buoyage System," which is widely used internationally, red buoys are typically used in conjunction with navigational aids to help mariners safely navigate waterways.

These buoys are usually numbered or marked in such a way to indicate they are on the left side of a vessel as it approaches from the open sea. This system aids in establishing a clear and consistent method for mariners to interpret their surroundings, particularly in areas with obstacles or where navigational precision is critical.

By designating the port side, the red buoy helps ensure that vessels maintain the correct course as they approach land, which is essential for safe navigation and collision avoidance.