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.
You go inside that space that has the bouy and stay to the port-side of the bouy.
Keep the buoy on your starboard side as you enter the harbor.
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Have the bout on your right
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A buoy marked with the number four and a flashing red light typically indicates a specific navigational point in maritime settings. It often serves as a warning or marker for hazards or navigational channels, particularly in areas requiring caution. The flashing red light enhances visibility, especially during low-light conditions, helping vessels identify the buoy's location and purpose.
keep the buoy on the starboard side
A buoy with the number 5 and a flashing green light indicates a navigational marker for vessels, typically signifying a safe passage or channel on the starboard (right) side when entering a harbor or waterway. If you are navigating, you should keep this buoy on your right side as you proceed. Always maintain a safe distance from the buoy and follow local navigation rules.
When going upstream, a buoy with a number 5 and flashing green light indicates the presence of a dam ahead. The dam may be used to generate hydroelectric power or to provide water for irrigation, and can pose a danger to boats and other vessels.
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 with the number 4 and a flashing red light while traveling upstream at dusk, you should treat it as a navigational warning. The red light typically indicates a hazard or an area to avoid. It's important to reduce your speed and proceed with caution, keeping a safe distance from the buoy. Additionally, consult your navigation charts or local regulations to understand the specific implications of that buoy's signal.