Navigational aid
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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.
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
Triangle shaped lead marks with lights.
large buoy in storage, Homer, Alaska
Non-directional beacon
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A non-directional beacon (NDB) or non-directional radio beacon is a radio beacon which does not include inherent directional information. Radio beacons are radio transmitters at a known location, used as an aviation or marine navigational aid. NDB are in contrast to directional radio beacons and other navigational aids, such as low-frequency radio range, VHF omnidirectional range (VOR) and tactical air navigation system (TACAN).
NDB transmitter at 49°12′21″N 002°13′12″W / 49.20583°N 2.22000°W / 49.20583; -2.22000 (Jersey West) Callsign JW – 'Jersey West'. 329.0 kHz.
One of the wooden poles of NDB HDL at Plankstadt, Germany
Ferrite antenna for non-directional beacon (NDB), frequency range 255–526.5 kHz