GNSS (Global Navigation Satellite System) is a satellite system used to accurately map the geographic location of the user's receiver anywhere in the world.
GNSS systems use a version of triangulation to locate the user through calculations involving information from a number of satellites. Each satellite transmits coded signals at precise intervals. The receiver converts signal information into position, velocity, and time estimates.
Depending on the level of accuracy needed, GNSS can provide up to cm-level values and data collection can be much faster than conventional surveying and mapping techniques previously used.