Other than dedicated radio beacons, any AM, VHF, or UHF radio station at a known location can be used as a beacon with direction-finding equipment. Most of them, especially in the Western world, are no longer in service, while some have been converted to telemetry transmitters for differential GPS. Marine beacons, based on the same technology and installed in coastal areas, have also been used by ships at sea. Due to relatively low purchase, maintenance and calibration cost, NDBs are still used to mark locations of smaller aerodromes and important helicopter landing sites. The aviation NDBs, especially the ones marking airway intersections, are gradually being decommissioned and replaced with other navigational aids based on newer technologies. It is a simple low- and medium-frequency transmitter used to locate airway intersections and airports and to conduct instrument approaches, with the use of a radio direction finder located on the aircraft. The most basic radio-navigational aid used in aviation is the non-directional beacon or NDB. 1.4 Single-letter high-frequency beacons.Radio beacons have many applications, including air and sea navigation, propagation research, robotic mapping, radio-frequency identification (RFID), near-field communication (NFC) and indoor navigation, as with real-time locating systems (RTLS) like Syledis or simultaneous localization and mapping (SLAM). Occasionally, the beacon's transmission includes other information, such as telemetric or meteorological data. Radio beacons transmit a continuous or periodic radio signal with limited information (for example, its identification or location) on a specified radio frequency. They are used for direction-finding systems on ships, aircraft and vehicles. But instead of employing visible light, radio beacons transmit electromagnetic radiation in the radio wave band. In navigation, a radio beacon or radiobeacon is a kind of beacon, a device that marks a fixed location and allows direction-finding equipment to find relative bearing. The remaining tower on Borough Hill in the UK is used as a radio beacon for aircraft navigation.
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