Definition
MARKER BEACON
An electronic navigation facility transmitting a 75 MHz vertical fan or boneshaped radiation pattern. Marker beacons are identified by their modulation frequency and keying code, and when received by compatible airborne equipment, indicate to the pilot, both aurally and visually, that he/she is passing over the facility.
Source: FAA Pilot/Controller Glossary (verbatim from the Federal Aviation Regulations).
Where This Term Is Used
1 section references this term in their FAR Decoded content.