Navigational aid
Marker to assist in safe passage making / From Wikipedia, the free encyclopedia
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"ATON" redirects here. For other uses, see Aton.
A navigational aid (NAVAID), also known as aid to navigation (ATON), is any sort of signal, markers or guidance equipment which aids the traveler in navigation, usually nautical or aviation travel. Common types of such aids include lighthouses, buoys, fog signals, and day beacons.