GNSS (Global Navigation Satellite System)
GNSS location utilises 4 different satellite constellations (GPS, GLONASS, Galileo, Beidou) for the best accuracy.
It requires a direct line of sight with the sky to work (working best outdoors or near windows)
The accuracy is usually between 0.5 - 10 metres.
Further reading
https://en.wikipedia.org/wiki/Global_Positioning_System (opens in a new tab)