You see a buoy with both red and green bands. What does this buoy mark?

A buoy with both red and green bands typically marks a navigational channel or indicates a junction where vessels can either proceed straight or choose a side. The red band usually indicates the port side (left when entering from the sea), while the green band indicates the starboard side (right when entering from the sea). This type of buoy helps mariners navigate safely through waterways. Always refer to local navigation charts for specific meanings, as buoy color codes can vary by region.