Marker beacon

{
  "id": "MLC-T-AVN-000593",
  "term": "Marker beacon",
  "field": "Aviation and air traffic control",
  "definition": "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.",
  "synonyms": [
    "Beacon"
  ],
  "see_also": [
    "Inner marker",
    "Middle marker",
    "Outer marker"
  ],
  "references": [
    "AIM",
    "FAA Pilot/Controller Glossary"
  ],
  "url": "https://mlchart.com/terminology/aviation/marker-beacon/"
}