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Precision Approaches

Precision approaches provide both lateral and vertical guidance to the runway.

ILS Approaches​

An Instrument Landing System (ILS) is a ground-based instrument approach system that uses two systems on the ground:the localizer and the glideslope.

ILS Components ILS Components

GLS Approaches​

The Ground-Based Augmentation System (GBAS) Landing System (GLS) is a satellite-based augmentation system that provides precision guidance towards a runway. The GLS system uses a ground-based station, usually located near the airport, to provide differential corrections to the GPS signal to provide precision guidance.

GLS approaches are usually flown by large commercial aircraft.