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BUOY. A piece of wood, or an empty barrel, floating on the water, to show the place where it is shallow, to indicate the danger there is to navigation. The act of Congress, approved the 28th September, 1850, enacts, " that all buoys along the coast, in bays, harbors, sounds, or channels, shall be colored and numbered, so that passing up the coast or sound, or entering the bay, harbor or channel, red buoys with even numbers, shall be passed on the starboard hand, black buoys, with uneven numbers, on the port hand, and buoys with red and black stripes on either hand. Buoys in channel ways to be colored with alternate white and black perpendicular stripes."

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
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--Port entrance gate--navigational marking (buoyage etc.) used for departures;
He added: "During the first quarter we launched a series of leading marine initiatives, like the maritime buoyage system and creating a safe and integrated marine environment, to enhance Dubai's reputation as a premier maritime hub.
The maritime buoyage system, which consists of 426 buoys, is based on organising maritime activities in beaches by allocating the first 50-100 meters of coastal waters for general swimming; while the next 100 metres is dedicated to light marine vessels, and the next 100 meters is considered a buffer zone.
It was responsible for the High and Low Lights at the mouth of the Tyne, its pilotage and its buoyage. It still sets exams for pilots for here and at Blyth and for deep sea divers in the North Sea and the English Channel.