Definition
GNSS is the umbrella term for constellations that broadcast ranging signals allowing a receiver to compute position, velocity and time anywhere on Earth. It covers GPS, GLONASS, Galileo and BeiDou, together with regional systems and augmentation services. A modern multi-constellation marine receiver tracks several systems at once, which improves satellite availability in harbours and under rig shadowing, and typically yields horizontal accuracy of a few metres without any augmentation.
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