... +1ppm)RMSVertical: +(5mm+1ppm)RMSData FormatRTCM2.1, RTCM2.3 , RTCM3.0, CMR, RTCA, Input and Output NMEA 0183 outputs, GSOF outputsPhysical ReferenceSize ... 2 meters drop onto concretesCharacteristicsButtons and Display:2 buttons/4 LED lightsI/O: RS232, High-speed USB, BluetoothChannel: 220 Channels Datalink ...