---
title: "OUTER MARKER — aviation glossary — OnlyPlanes"
description: "A marker beacon at or near the glideslope intercept altitude of an ILS approach."
canonical_url: "https://onlyplanes.ru/en/learn/outer-marker"
locale: en
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  "og:description": "A marker beacon at or near the glideslope intercept altitude of an ILS approach."
  "og:image": "https://onlyplanes.ru/images/aviation/aircraft/boeing-787.webp"
  "og:title": "OUTER MARKER — aviation glossary"
---

> Index of every page on this site: [llms.txt](https://onlyplanes.ru/llms.txt)

Operations

# OUTER MARKER

OM

TERM · Operations

At a glance

## Meaning of OUTER MARKER

A marker beacon at or near the glideslope intercept altitude of an ILS approach.

### More about OUTER MARKER

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.

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