Buoy
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A buoy is a floating device that can have many purposes. It can be anchored or allowed to drift with ocean currents.
Smart buoy with solar panels, LED light, and corner reflectors for radar
Green can #11 near the mouth of the Saugatuck River (IALA region B).
Green Can #11 on a nautical chart
The red buoy (1895), by Paul Signac. The usual red color of the buoys has gained some attention even by artists.
Navigational aid
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A navigational aid, also known as aid to navigation, is any sort of signal, markers or guidance equipment which aids the traveller in navigation, usually nautical or aviation travel. Common types of s
Buoy
…meters high equipped with a powerful light monitored electronically as a replacement for a lightvessel. They may be marked on charts as a "Superbuoy." Lateral marker buoys Safe water mark, fairway buoys, or outer buoys mark the entrance to a channel or nearby landfall…
The entrance to the inner harbour of the Port of Fremantle, Australia, with a yellow special mark at left, a region A red port lateral mark at right, and a region A green starboard lighthouse in the background
Region B green port lateral marks (with Galápagos sea lions (Zalophus wollebaeki)) in the Galápagos Islands
IALA-B starboard hand bifurcation buoy
Triangle shaped lead marks with lights.