In aviation, a localizer (LOC) provides runway guidance to aircraft. It is not to be confused with a locator, although both are parts of aviation navigation systems. The localizer is a component of an instrument landing system (ILS) for the runway centreline when combined with a glide slope transmitter. When the glideslope is unserviceable, the lo...
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http://en.wikipedia.org/wiki/Localizer
A localizer is a form of radio beacon used in instrument landing systems for aircraft. It is located about 230 metres beyond the stop end of an airfield runway and radiates two signals of different frequencies from two aerials whose polar diagrams overlap in such a way that their signals are of equal strength along the centre of the runway. In the ...
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http://www.probertencyclopaedia.com/browse/GL.HTM
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