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Reference.org
Instrument landing system localizer
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<p>An instrument landing system localizer, or simply localizer (LOC, or LLZ prior to 2007), is a system of horizontal guidance in the <a href="/facts/Instrument_landing_system/CTLARvA8">instrument landing system</a>, which is used to guide aircraft along the axis of the <a href="/facts/Runway/EYy72SPJ">runway</a>. </p>