Outer marker

{
  "id": "MLC-T-AVN-000709",
  "term": "Outer marker",
  "field": "Aviation and air traffic control",
  "definition": "A marker beacon at or near the glideslope intercept altitude of an ILS approach. It is keyed to transmit two dashes per second on a 400 Hz tone, which is received aurally and visually by compatible airborne equipment. The OM is normally located four to seven miles from the runway threshold on the extended centerline of the runway.",
  "abbreviation": "OM",
  "see_also": [
    "Instrument landing system (ILS)",
    "Marker beacon"
  ],
  "references": [
    "AIM",
    "FAA Pilot/Controller Glossary"
  ],
  "url": "https://mlchart.com/terminology/aviation/outer-marker/"
}