A number 4 buoy typically indicates a lateral marker used in maritime navigation, signifying the left side of a channel when entering from the sea. It is part of the IALA (International Association of Lighthouse Authorities) buoyage system, specifically following the "IALA A" system, which is used in most parts of the world. The buoy is usually colored red or has a red band and may also feature a specific shape, such as a can or cylinder, to help mariners identify it easily.
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?
lp
Keep the buoy on your starboard (right) side.
Keep the buoy on your starboard side as you enter the harbor.
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.
Have the bout on your right
keep the buoy on the starboard side
go around it on either side
no
Do not pass between the buoy and the shore
A boat should cruise between a green and red buoy. The red buoy will always be located on the right side of your boat. Red buoys will always mean , returning, red, and right. There will be a number on a red buoy that will give the chart location. The numbers will always be even.
Danger.