GPS+GLONASS Tracking, RTK, Dual Bluetooth Sokkia GSR2700ISX Fully Integrated High Performance GNSS System with Dual Bluetooth SOKKIA GSR2700ISX is the latest advanced system for surveying professionals around the world. The new GSR2700 ISX features a fully integrated, triple-frequency, high-performance receiver with GPS plus Russian-based GLONASS satellite tracking capability. The receiver offers seventy-two universal channels for increased satellite coverage and improved performance on the job. For more information, give us a call at 800.856.0554