You are traveling upstream on a river at dusk. You see a buoy with the number 4 and a flashing red light. What should you do?
Keep the buoy on your starboard (right) side.
When passing a buoy marked with the number 4 and a flashing red light, you should keep the buoy on your port (left) side. This indicates that you are in a channel where the right side is marked with green buoys. Always maintain a safe distance from the buoy and be aware of any potential hazards in the water.
You go inside that space that has the bouy and stay to the port-side of the bouy.
Since this is a Green Lighted Buoy sighted while approaching a harbour,this is a Lateral port hand side mark, IALA region B. To keep this buoy on your port side while travelling upstream.
When you see a buoy marked with the number 4 and a flashing red light, it indicates that you are approaching a hazard or an obstruction. You should pass the buoy on the side that is indicated as safe, typically to the right (starboard) side when traveling upstream or toward a harbor. This is in accordance with the lateral system of navigation aids. Always ensure to maintain a safe distance and be vigilant for other vessels or obstacles.
I think you should----Keep the buoy on your port (left) side.
Frequency
As you enter a harbor from the open sea, you see a lighted buoy bearing the number 3. How should you pass it?
entering a harbor from the open sea, ther is a lighted buoy bearing the number 6, how should i pass it
The number of ocean waves that pass a buoy in one second is referred to as the wave frequency or wave period, which is typically measured in hertz (Hz) or seconds. The specific value will depend on the wave conditions at that particular location and time.
Do not pass between the buoy and the shore