Multiple choice

Which of the following is a type of marker beacon for ILS?

  1. Outer Marker

  2. Inner Marker

  3. Middle Marker

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

ILS uses three types of marker beacons: the Outer Marker (OM) located approximately 4-7 miles from threshold, the Middle Marker (MM) about 0.5-0.8 miles out, and the Inner Marker (IM) closer to the runway (mostly for Category II/III operations). All three serve as position fixes during approach.

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