ILS (Instrument landing system)

• Localizer

  • The horizontal azimuth is provided by the localizer
  • The localizer is more or less same as VOR but four times more sensitive to VOR

• Markers

  • Range information for the ILS is normally provided by it.
  • DME is collocated with some ILS.

• Glide slope path devices.

  • The vertical azimuth is provided by the glide slope path devices.
  • It is also used for the automatic landing of the A/C.

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