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Glidepath - A descent profile determined for vertical guidance during a final approach.
Glide slope - A descent profile determined for vertical guidance during a final approach.
Glideslope intercept altitude - The published minimum altitude to intercept the glideslope in the intermediate segment of an instrument approach.
Ground to air communication – one way communication from stations on the surface of the earth to aircraft stations
Global navigation satellite system - A worldwide position and time determination system that includes one or more satellite constellations, aircraft receivers and system integrity monitoring, augmented as necessary to support the required navigation performance for the intended operation.
Global positioning system - GPS - A space-base radio positioning, navigation, and time-transfer system. The system provides highly accurate position and velocity information, and precise time, on a continuous global basis, to an unlimited number of properly equipped users.
The system is unaffected by weather, and provides a worldwide common grid reference system. The GPS concept is predicated upon accurate and continuous knowledge of the spatial position of each satellite in the system with respect to time and distance from a transmitting satellite to the user. The GPS receiver automatically selects appropriate signals from the satellites in view and translates these into three- dimensional position, velocity, and time. System accuracy for civil users is normally 100 meters horizontally.
Ground visibility - The visibility at an aerodrome as reported by an accredited observer or by automatic systems.
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