The u-blox UBX-M9140 chip and the NEO-M9N module can receive signals from up to four GNSS constellations — GPS, Glonass, Beidou, and Galileo — concurrently, to achieve high positional accuracy.
source http://www.electronicproducts.com/RF_and_Microwave_Components/RF_and_Microwave/GNSS_chip_meets_security_challenges_improves_position_accuracy.aspx
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