Sokkia GRX3 Base/Rover UHF 440-470 Sokkia (No reviews yet) Write a Review The Sokkia GRX3 is smaller, lighter, and packed with the most advanced GNSS technology in a design built to withstand the harshest field environments. All signals, all satellites and all constellations — in a compact, rugged design, with an integrated IMU and eCompass. Price does not include necessary options for RTK. With RTK options kit is $36,240.00