GNSS Viewer (GPS, Glonass, Beidou, Galileo, IRNSS, QZSS) displays current GNSS info as reported by the built-in GNSS unit of your phone. : r/CKsTechNews
International cooperation in Promoting a Global Navigation Satellite System (GNSS) of Systems
Amazon.com: Beitian g-Mouse UBX-M9 GPS GLONASS BeiDou Galileo SBAS QZSS Module with Antenna USB GNSS Receiver BM-609 : Electronics
What's The Differences Between the 5 GNSS Constellations?