Dual Satellites Dual Frequency L1 L2 All-in-one Handheld GPS Receiver
new, More Accurate GPS Sports Watch | There's A Catch Though
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