I am an Aircraft Engineer with more than 35 years of experience.

An instrument landing system (ILS) enables a pilot to land an airplane when the pilot cannot see the runway. It is a radio navigation system which provides aircraft with horizontal and vertical guidance during landing and, at certain fixed points, indicates the distance to the reference point of landing.Once established on an approach, the pilot follows the ILS approach path indicated by the localizer and descends along the glide path to the decision height. This is the height at which the pilot must have adequate visual reference to the landing environment like runway or runway lighting to decide whether to continue the descent to a landing; otherwise, the pilot must execute a go around , then try the same approach again, or divert to another airport.
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