it doesn't indicate anything, aside from the fact that the buoy is there. the light simply makes it more visible in foggy or dark conditions.
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?
A flashing green light buoy is a navigational aid used in maritime environments to mark specific locations, such as channels or hazards. The buoy emits a green flashing light to help guide vessels safely, particularly during nighttime or low visibility conditions. These buoys usually indicate the right side of a channel when approaching from the sea, adhering to the IALA buoyage system. Their distinctive color and light pattern help mariners identify safe passage routes.
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Have the bout on your right
An anchor buoy is a small buoy attached to an anchor by a light line and used to indicate the position of an anchor.
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.
A buoy with the number 4 and a flashing red light typically indicates a navigational marker that signals the presence of a hazard or a specific channel. When traveling upstream at dusk, the flashing red light serves as a warning to boaters to exercise caution in that area. It’s essential to keep the buoy on your port (left) side when navigating upstream, as it helps indicate the correct course through the waterway. Always refer to local navigation charts for specific meanings and regulations associated with buoys.
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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.
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.