Discussion
The localiser of an instrument landing system provides
Answer: A
Correct answer: Lateral guidance along the runway centreline
The localiser provides guidance in azimuth - it tells the pilot whether the aircraft is left or right of the extended runway centreline, and by how much. It is the horizontal half of an instrument landing system.
Vertical guidance to the touchdown zone is the glide path's function, transmitted separately in the UHF band and tuned automatically with the localiser. Distance comes from marker beacons or, increasingly, from distance measuring equipment, and height above terrain from the radio altimeter. Each element answers a different question, and an approach uses all of them together.
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