You are traveling upstream on a river at dusk you see a buoy with the number 5 and a green flashing light what should you do?

If you see a buoy with the number 5 and a green flashing light while traveling upstream, it indicates that you are approaching a channel marker. The green light typically signifies the right side of the channel when navigating upstream. You should keep the buoy on your right side and proceed cautiously, as it marks the safe navigable waterway. Always be aware of your surroundings and any potential obstacles in the water.