Navigation Satellite Tracker — GPS, GLONASS, Galileo, and BeiDou

Navigation satellites, collectively known as Global Navigation Satellite Systems (GNSS), are the foundation of modern positioning technology used by billions of devices worldwide. Four major constellations provide overlapping global coverage: the US GPS, Russian GLONASS, European Galileo, and Chinese BeiDou systems.

Each constellation operates approximately 24 to 30 satellites in medium Earth orbit at altitudes between 19,000 and 23,000 km. By receiving signals from at least four satellites simultaneously, a GNSS receiver can calculate its position to within a few meters. Multi-constellation receivers use all four systems together for improved accuracy and reliability.

This tracker displays all four GNSS constellations simultaneously, letting you visualize their orbital planes, see which satellites are above your horizon at any moment, and understand the orbital geometry that underpins modern navigation and timing infrastructure.