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What is the function of a marker beacon on an ILS approach?
  • A
    It is used to indicate a requirement to commence the final approach procedure.
  • B
    It is to indicate aircraft's vertical position in relation to the glide path.
  • C
    It is used to indicate a requirement to initiate a configuration change.
  • D
    It indicates aircraft's horizontal position during the approach.
Marker beacons are placed in a predetermined sequence before the threshold. The task of the markers is to produce a radiation pattern with a vertical beam upwards. By locating the markers at set distances before the threshold, the pilot can expect to fly above the markers at known distances. Consequently, the remaining distance from the final approach can be monitored. Therefore, we can say that the marker beacons indicate the aircraft’s horizontal position during the approach.

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