Product Information


Easy-to-use, efficient and intuitive work flow, designed for advanced network RTK survey, compact and rugged, the X91+ GNSS is the perfect choice for demanding survey applications.

By combining decades of positioning and surveying know-how, the X91+ GNSS is one of the most powerful GNSS RTK solution, with no compromise with quality but at a price point that every surveyors can afford.

The X91+ GNSS RTCM compliance with major GPS brands allow trouble free integration into an existing pool of survey instrument.


▪  220-channel embedded leading GNSS core module GPS/GLONASS/Galileo/BeiDou
▪  Built-in GPRS modem and UHF data link  
▪  Seamless interoperability with major GPS/GNSS manufacturers  
▪  Small, lightweight and rugged design for demanding environment field work  

Product Features


GNSS Characteristics
220 channels GPS: L1C/A,L1C,L2C, L2E, L5
  GLONASS: L1C/A, L1P, L2C/A, L2P, L3
  Galileo: E1, E5A, E5B (test)
  Beidou: B1, B2(optional)
Advanced multipath mitigation  
Low noise carrier phase measurement  


Performance Specifications (1)
Real Time Kinematics (RTK) Horizontal: 8mm+1ppm
  Vertical: 15mm+1ppm RMS
  Initialization time: typically<10s
  Initialization reliability: typically >99.9%
Post Processing Static Horizontal: 3mm+0.5ppm RMS
  Vertical: 5mm+0.5ppm RMS
  Baseline Length: ≤300km
 With SBAS <1 m RMS


1 RS232 serial port  
1 high-speed USB  
Integrated GSM/GPRS modem  
Integrated Bluetooth ® class 2  
CHC Radio modem internal Rx 430-450 / 450-470 MHz
 Optional radio modem (2) External Tx DL5: 1W-20W adjustable
  Internal Rx/Tx:403-473 MHz
  Power: 1 WATT
Protocols RTCM2.1, RTCM2.3, RTCM3.0, CMR, CMR+ input and output
  NMEA0183 outputs  
  RINEX and HCN outputs for GNSS raw data
 Data Storage 4 GB internal memory
  GPS device mounts as a USB external hard drive


Size (H×D) 85 ×180 mm (3.3 ×7.1 in)
Weight 1.35Kg with battery (48 oz)
Working Temperature -40 °C − +65°C (-40 °F − 149°F)
Storage Temperature -40 °C − +75°C (-40 °F − 167°F)
Humidity 100% condensation
Dustproof IP67
Waterproof Protected from temporary immersion to depth of 1 meter floats.
Shock Survives a 2−meter drop on to concrete


Power consumption 2.6 W
Li-ion battery capacity 2200 mAh
Battery life Typical 5 hours in RTK and STATIC mode
External power input 9-18 VDC


Software (optional)
CHC's Landstar field data collection software  
Carlson's SurvCE field data collection software