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Sep 24, 2018


The two main types of Aids to Navigation are buoys and beacons.

 

Buoys are Aids that float on top of the water, but are moored to the bottom of the                      

body of water. Some have a light affixed to the top; some do not.

 

 A buoy with a cylindrical shape and a conical

 top is referred to is a “nun.” A buoy with a cylindrical shape

and a flat top is called a “can.”

 

Beacons are Aids that are permanently fixed, most commonly to the bottom of a

body of water. A beacon that has a light attached is simply referred to as a “light”;

                                                                                                                                                                     

 

Both buoys and beacons can provide variety of navigation information via

shape, color, light, and/or audible signal.

 

Dayboards are informational signboards.

The term topmark refers to a non-lighting element, such as a sphere, that may be affixed to the top of an Aid.