Definition
A worldwide position, velocity, and time determination system made up of one or more satellite constellations, aircraft receivers, and a system integrity monitoring component. GNSS provides aircraft with continuous three-dimensional position information anywhere on or near the surface of the Earth.
Plain English
GNSS is the general name for satellite-based navigation. A network of satellites in orbit sends signals down to a receiver in the aircraft, which uses those signals to work out where the aircraft is, how fast it is moving, and the exact time.
Context Anchor
Seen in cockpit navigation equipment, satellite-based navigation procedures, and discussions of aircraft navigation capability.
Derivation
Global means worldwide. Navigation comes from the Latin navigare, meaning to sail or steer a ship. Satellite comes from the Latin satelles, meaning attendant or companion, used in space terms for an object that orbits a larger body. Together the name describes a worldwide steering aid built from orbiting companions.
Why Pilots Care
Delivers continuous, accurate position data that replaces many ground-based navigation aids and supports precise approaches.
Analogy
It is similar to how a phone map uses satellite signals to find your location, but aircraft equipment and procedures have stricter requirements because they are used for flight safety.
Intuition Check
Do not assume this term means only GPS. GPS is one Global Navigation Satellite System; the broader term covers satellite navigation systems in general.
Example Sentence 1
The aircraft's GNSS receiver displayed the position, ground speed, and time accurate to within a few meters.
Example Sentence 2
In remote areas without VOR coverage, the crew used the Global Navigation Satellite System to maintain accurate routing.