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Types of Buoys

Isolated Danger Marks
Isolated Danger Marks

"Isolated Danger Marks" are found in both IALA Regions “A” and “B” and are used to mark small, isolated dangers where navigable water will be found in all directions around the marked danger. These marks, beacons or buoys, mark dangers such as shoals and rocks, and are also frequently used to mark wrecks.

Safe Water Marks
Safe Water Marks

A Safe Water Mark, as defined by the International Association of Lighthouse Authorities, is a sea mark used in maritime pilotage to indicate the end of a channel.

Special Marks, for Example:
Special Marks, for Example:

Archived examples. Special marks are used to mark areas of no navigational significance but have a special nature. The chart needs to be consulted to indicate the purpose of the buoy as there will normally be extra information available.