All IALA buoys are warning or cautionary buoys.
Blue
Blue
Blue
Blue
Blue
SB-47 Blue
SB-47 Blue
A cautionary buoy warns boaters of potential hazards in the water, such as shallow areas, rocks, or underwater obstructions. These buoys are typically yellow and may feature symbols or markings to indicate the specific danger. They serve as a visual alert, encouraging boaters to navigate carefully and maintain a safe distance from the hazard.
red
Blue
Green is a square shaped daymark buoy.