Plain English Meaning
A navigation system that uses signals from satellites in space to tell the aircraft exactly where it is, how high it is, and what time it is.
Full Definition
A satellite-based radio navigation system that provides aircraft with highly accurate position, altitude, and time information anywhere on Earth. The system works by receiving signals from a network of orbiting satellites; the aircraft's GPS receiver calculates its own position by measuring the time it takes signals to arrive from multiple satellites simultaneously.
Context Anchor
Seen in navigation, flight planning, cockpit displays, and instructor discussions about using modern flight equipment correctly.
Derivation
From 'global' (worldwide) and 'positioning' (locating). Originally developed by the U.S. Department of Defense as NAVSTAR in the 1970s, then opened for civilian use. The name simply describes what it does: positions you globally.