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Danger.
Yellow represents caution on these buoys. Usually meaning to stay away from them. They are used to indicate pipes, dredge lines, traffic schemes, an isolated danger.
It is float moored in water to mark a location, warn of danger, or indicate a navigational channel. Usually is bright-colored and attached by rope to the seabed to mark channels in a harbor or underwater hazards. Also used as a life vest.
A diamond on a buoy means danger or warning. If the diamond on the regulatory buoy is open, it's a warning. It may indicate the presence of a rock, dam, wreck or other danger. Usually, the danger present is indicated under the diamond. If the diamond on the regulatory buoy is crossed, it means you should not enter. It may be a swimming area (which would be a "do not enter" area for boats), rapids, or some other danger.
Danger
Danger
Danger
Danger
Danger
Danger
Danger!
A diamond on a buoy means danger or warning. If the diamond on the regulatory buoy is open, it's a warning. It may indicate the presence of a rock, dam, wreck or other danger. Usually, the danger present is indicated under the diamond. If the diamond on the regulatory buoy is crossed, it means you should not enter. It may be a swimming area (which would be a "do not enter" area for boats), rapids, or some other danger.