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ILS Instrument Landing System, electronic equipment that guides an airplane precisely onto the runway. Two of its subsystems, 'localizer' and 'glide slope,' are radio transmitters on the ground which define respectively the straight-in course over the ground and the vertically slanting path to the touch-down point. A pair of needles on the panel provide the requisite guidance. On my approaches, it looks like a sword fight. Outer - Middle - Inner Marker

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FG to upgrade Airports’ Instrument Landing Systems

Instrument landing system - Wikipedia