Isolated danger buoys are moored in navigable waters to indicate the presence of an underwater hazard, such as rocks or wrecks, that is not immediately visible. These buoys typically have a black and red color scheme, with two black spheres on top, and are positioned away from the danger they mark. They are used to guide vessels safely around the hazard, ensuring safe passage through the area.
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.
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.
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.
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Danger!
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