Which lateral buoy indicates to keep the obstruction on the port side when heading upstream?

In the IALA Maritime Buoyage System, lateral buoys are used to indicate navigation channels and provide guidance to mariners. When dealing with an obstruction, understanding the buoy colors and their meanings is essential for safe navigation.

The red buoy signifies that vessels should keep the buoy to their right (starboard side) when moving upstream. This means if you are navigating upstream and see a red buoy, you should keep the obstruction on your port side, following the convention of "Red Right Returning." This system establishes a clear and standardized way of marking channels to help ensure safe passage and reduce the risk of accidents.

The distinction of the red buoy is particularly important for ensuring correct navigation through narrow or hazardous waters. Each type of buoy in the system carries a specific purpose, so understanding the color and corresponding action is crucial for mariners. By adhering to the indication given by the red buoy, boaters can navigate safely past potential hazards while keeping the obstruction on their port side.