Unlike in VOR navigation, turning the OBS knob when a localizer is in-use does not affect the CDI displacement. Unlike VORs, which facilitate navigation on any bearing around them (from 0º to 359º), localizers only support a single, specific direction. In both, the pilot stays on the desired track by keeping the CDI (Course Deviation Indicator) centered. Navigation with localizers and VORs is very similar. VORs and localizers share the same navigation radio and display equipment in the flight deck. It can serve as part of an ILS approach or in a stand-alone localizer-only procedure. The primary component of the ILS is the localizer, which provides lateral course guidance. ILS relies on multiple ground-based and aircraft equipment that provides: It is still, by far, the most commonly used precision instrument approach procedure. The ILS is one of the oldest yet most widely used instrument approach procedures still in service. You may already know that Instrument approaches are IFR procedures designed to guide the aircraft from the en-route part of the flight to a position from which it can make a safe landing.Ī precision approach provides lateral (left and right) and vertical (up and down) course guidance on the final approach leg. An Instrument Landing System ( ILS) enables pilots to shoot precision instrument approaches to a runway.īefore digging into the nuts and bolts of ILS, let's review what an instrument approach, and more specifically, a precision-instrument approach is.
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