buoy

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buoy

(boi, bo͞o`ē), float anchored in navigable waters to mark channels and indicate dangers to navigation (isolated rocks, mine fields, cables, and the like). The shape, color, number, and marking of the buoy are all significant, but unfortunately there are two competing systems of color coding which have been adopted in different parts of the world. The International Association of Lighthouse Authorities (IALA) adopted a system in 1977 which uses red for the left–hand side of a channel returning from the sea and green for the right side. Because the American rule has always been "red to the right returning," the IALA accepted a second system in 1983 which would keep the traditional color–coding for U.S. waters. Both systems use yellow to indicate special zones, such as fishing areas, anchorages, dredging operations, etc. Although the spar buoys (upright posts) used in northern latitudes are usually wooden, large buoys are generally made of steel or iron. Nun buoys have conical tops; can buoys have flat tops. Buoys may be fitted with bells or whistles (usually operated by motion of the waves), and battery-powered light buoys are commonly used; radio buoys came into use in 1939. There are also mooring buoys, used for the anchoring of ships.

buoy

[bȯi]
(engineering)
An anchored or moored floating object, other than a lightship, intended as an aid to navigation, to attach or suspend measuring instruments, or to mark the position of something beneath the water.

buoy

a distinctively shaped and coloured float, anchored to the bottom, for designating moorings, navigable channels, or obstructions in a body of water
References in classic literature ?
For half an hour they maintained silence, Duncan, his head resting on the arm that was on the buoy, seemed asleep.
University of Alaska Fairbanks scientists installed two research buoys to help study how climate change may be affecting the pH level of northern seas.
The Coast Guard is looking into the idea of using a system of buoys outfitted with sensors to monitor threats in waterways.
Two unloading buoys will be separated by a distance of 3.
Surface buoys kept the lines upright in the water, marked the lines' locations, and carried meteorological instruments such as rain and wind gauges.
The Grand River Conservation Authority has installed warning buoys or booms upstream of GRCA dams to warn canoeists, kayakers and boaters to stay away from the dams.
Currently deployed wave buoys do not provide the wave data that is necessary to conduct this study.
Zadco's engineering and projects department team's leader Seddiq Khouri said Zadco chose to class the loading terminal in order to ensure that the SPM buoys were designed, fabricated and installed in accordance with a highly recognised international standard.
Zadco chose to class the loading terminal in order to ensure that the SPM Buoys are designed, fabricated and installed in accordance to a highly recognized international standard.
ENERGY RESOURCE-9 March 2009-WIND: Weather Buoys Launched to Measure Wind Off Coast of South Carolina(C)2009 JeraOne - http://www.
The crew upgraded 41 buoys from incandescent lighting to laser emitting diode (LED) technology.
It was apparent that one of the mark buoys was destroyed, but it was not possible to provide conclusive evidence with regards to which boat had hit or destroyed the buoy," said WPPA race director, Rory Power.