The MBX-4 receives, and demodulates RTCM SC-104 differential correction data transmitted by 300 kHz DGPS radiobeacons. The MBX-4 house the Hemisphere GPS dual channel SBX-4 beacon receiver engine that features high-performance beacon search algorithms and a highly sensitive, adaptive architecture.
Source: “Resources & Support.” Hemisphere GNSS. N.p., n.d. Web. 04 June 2017.