... long-distance RTK 2,GNSS positioning performance 3,Application of seamless compatible CORS system ... data in real time all day around. In USB communication port, plug and play, no need extra software ... . . . .CMR, CMR+, RTCM 2.1, 2.2, 2.3, 3.0 , 3.1Navigation outputs . . . . . .ASCII: NMEA-0183 GSV, AVR, ... CMR+,RTCM2.1,RTCM2.2,RTCM2.3,RTCM3.0,RTCM3.1Observation data format: ZHDPort component1 serial port ...