Amazon.com: Taidacent Dual Frequency GNSS Receiver Small Size Small Volume Drone GPS Module GPS+Glonass Dual Band GPS Receiver Positioning Module BN-180 : Electronics
Amazon.com: Taidacent Dual Frequency GPS Module 33db High Gain 5cm Line IPEX Terminal GPS+ Beidou Built in GPS Receiver with Active Ceramic Dual Band Pach Antenna BT-25B : Electronics
U-blox announces secure dual-band GNSS timing module - GPS World