Definition
A worldwide position, velocity, and time determination system that uses signals from a constellation of orbiting satellites, supported by ground control stations and airborne receivers, to provide aircraft navigation information. GNSS is a general term that encompasses individual satellite navigation systems such as the U.S. GPS, Russia's GLONASS, Europe's Galileo, and China's BeiDou.
Plain English
A navigation system that uses satellites circling the Earth to tell an aircraft exactly where it is, how fast it's going, and the precise time. GNSS is the umbrella name covering all the country-specific satellite navigation systems, including GPS.
Context Anchor
Pilots encounter GNSS in panel navigation equipment, moving-map displays, flight planning, and GPS-based route guidance.
Derivation
From 'global' (worldwide), 'navigation' (finding your way), and 'satellite system' (a network of orbiting satellites). The term was coined to describe satellite-based navigation generically, rather than naming one country's system.
Why Pilots Care
Delivers continuous, high-accuracy position data independent of ground stations, enabling GPS approaches, oceanic routing, and reduced reliance on older navigation infrastructure.
Intuition Check
GNSS does not mean only GPS. GPS is one example of a GNSS; the broader term means any global satellite system used for navigation.
Example Sentence 1
The aircraft's GNSS receiver provided continuous position updates throughout the flight.
Example Sentence 2
GNSS signals remained reliable throughout the flight over remote terrain.