Plain English Meaning
GNSS is the broad name for any system that uses satellites in space to tell an aircraft exactly where it is, how fast it is moving, and what time it is. GPS is the most familiar example, but it is one of several such systems worldwide.
Full Definition
A general term referring to any worldwide satellite-based positioning, navigation, and timing system that allows a suitably equipped aircraft to determine its position, velocity, and time using signals from a constellation of orbiting satellites. GNSS is the umbrella name covering individual systems such as the U.S. GPS, the European Galileo, the Russian GLONASS, and China's BeiDou, along with augmentation systems that improve their accuracy and integrity for aviation use.
Context Anchor
Seen in , , , and discussions of .