Plain English Meaning
A navigation system that uses signals from satellites in space to tell the aircraft exactly where it is, how fast it is going, and what time it is.
Full Definition
A satellite-based radio navigation system that provides aircraft with highly accurate position, velocity, and time information anywhere on or near the Earth. The system uses a constellation of satellites broadcasting precise timing signals, which a GPS receiver in the aircraft uses to calculate its three-dimensional position by measuring the time it takes signals to arrive from multiple satellites at once.
Context Anchor
Seen on cockpit navigation displays, flight plans, instrument procedures, and air traffic control communications involving navigation.