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Two signals guide the approach
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An instrument landing system gives you lateral guidance from the localizer and vertical guidance from the glide slope. These are separate indications: being centered on one does not mean you are centered on the other.
Explore the illustration. The top view shows the runway course. The side view shows the descent path. Both are simplified views of a front-course ILS with valid reception.
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Instrument Rating Course with Written Prep and the study guide.
