x91Easy-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
GNSS Characteristics
220 channels GPS: L1C/A,L1C,L2C, L2E, L5
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
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) Internal Rx/Tx:403-473 Mhz
External Tx DL5: 1W-20W adjustable
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) 80×180 mm (3.1×7.1 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
Typical power consumption 2.6 W
Battery capacity 2200 mAh
Operating times on internal battery typical 5 hoursin RTK mode
External power input 9-18 VDC

(1) Accuracy, TTFF and reliability specifications may be affected by multi path, satellite geometry and atmospheric conditions. Performances assume minimum of 5 satellites and follow up of recommended survey practices.

(2) UHF type approvals are country specific – Specifications are subject to change without notice.