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Two buoys at the National Maritime Museum main gate.
View full size imageTwo buoys at the National Maritime Museum main gate. © NMM
A buoy is a floating mark used mainly to help a ship navigate. It is used to mark a channel or bank or spot where there is an obstacle on the seabed. Buoys came into use in Europe in the late 15th or early 16th century.

National Maritime Museum/Royal Observatory Greenwich New Opportunities Fund  
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