CHCNAV i83 IMU Rover


Smart and versatile IMU-RTK GNSS receiver for even more intuitive surveying.

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Powered by 1408-channel GNSS and iStar technology

The i83 GNSS smart antenna delivers centimeter precision in seconds and maintains reliable fixed RTK accuracy even in typically challenging environments. Its quick-start feature gets you up and running within 30 seconds of powering up the receiver, making point collection faster than ever as you move from place to place. The third-generation high-gain antenna increases GNSS satellite signals tracking efficiency by up to 30% and provides accurate, survey-grade positioning when using GPS, Glonass, BeiDou, Galileo, and QZSS constellations. The integrated iStar technology ensures optimal GNSS RTK surveying in all GNSS survey applications.


34 hours on single charge to ensure operation when you need it

The i83 GNSS ultra-low-power SoC (System-on-Chip) electronic design and smart power management dramatically improve GNSS survey time span and eliminate the need for spare or external batteries. Up to 34 hours of autonomous work are achieved when operated as a GNSS RTK network rover and up to 16 hours as an RTK base station. i83 GNSS charges from a power bank or a standard USB-C charger. No matter where or when the GNSS surveys are carried out, the i83 GNSS’ magnesium alloy body is shock-, dust- and waterproof to ensure uninterrupted performance, even in the most demanding job site conditions.


Unrivaled universal GNSS receiver
i83 GNSS has all the connectivity features a surveyor needs to complete any GNSS surveying project scenario. Built-in Wi-Fi, Bluetooth, and NFC technologies provide a seamless connection to field data controllers and tablets. Integrated 4G and UHF modems enable any GNSS surveying mode, from RTK Networks NTRIP connections to UHF base- rover configuration. GNSS RTK corrections are accessed or broadcasted continuously for accurate positioning in all circumstances. The high-resolution color display provides a clear view of the i83 GNSS status. Whether it is set up as a UHF RTK base station, recording raw data for further GNSS post-processing, or simply being used as a UHF or 4G network rover, it provides the full control of survey operations.


Efficient IMU-RTK survey made easy
The i83 GNSS built-in IMU for automatic pole tilt compensation boosts surveying, engineering, and mapping speed and efficiency by up to 30%. Real-time, interference-free initialization of the 200 Hz inertial module is achieved in just 5 seconds and ensures 3-centimeter accuracy over a pole tilt range of up to 30 degrees. Measuring and staking out with the i83 GNSS is fast, easy, and highly productive, whether you are an engineer, site foreman, or surveyor


Channels1408 channels
GPSL1 C/A, L2C, L2P, L5
GalileoE1, E5a, E5b, E6
BeiDouB1I, B2I, B3I, B1C, B2a, B2b
QZSSL1, L2, L5, L6
GNSS Accuracies
Real Time Kinematics (RTK)Horizontal: 8 mm + 1 ppm RMS
Vertical: 15 mm + 1 ppm RMS
Initialization time: <10 s
Initialization reliability: >99.9%
Post-processing kinematics (PPK)Horizontal: 3 mm + 1 ppm RMS
Vertical: 5 mm + 1 ppm RMS
Post-processing staticHorizontal: 2.5 mm + 0.5 ppm RMS
Vertical: 5 mm + 0.5 ppm RMS
Time to first fixCold start: < 45s
Hot start: < 10s
Signal re-acquisition: < 1s
RTK tilt
Additional horizontal pole-tilt uncertainty typically less than 10 mm + 0.7 mm/° tilt
Size (L x W x H) Φ 152 mm x 78 mm
Weight1.15 kg (2.54 lb)
Front panel 1.1” OLED Color Display
2 LED, 2 physical buttons
Ingress protectionIP67 waterproof and dustproof,
protected from temporary
immersion to depth of 1 m
ShockSurvive a 2-meter pole drop
SIM Card TypeNano-SIM card
Network modemIntegrated 4G modem.
B1, B2, B5, B8
Wi-Fi802.11 b/g/n, access point mode
Bluetooth®V 4.2
Ports 1 x 7-pin LEMO port (RS-232)
1 x USB Type-C port
(external power, data download,
 firmware update)
1 x UHF antenna port
(TNC female)
UHF radioStandard Internal Rx/Tx:
410 – 470 MHz
Transmit Power: 0.5 W to 2 W
Protocol: CHC, Transparent,
TT450, Satel
Link rate: 9,600 bps to 19,200 bps
Range: Typical 3 km to 5 km
Data formatsRTCM 2.x, RTCM 3.x,
CMR input / output
HCN, HRC, RINEX 2.11, 3.02
NMEA 0183 output
NTRIP Client, NTRIP Caster
Data storage8 GB internal memory
Power consumptionTypical 4.5 W
(depending on user settings)
Li-ion battery capacityBuilt-in non-removable battery
9,600 mAh, 7.4 V
Operating time on
internal battery
UHF/ 4G RTK Rover: up to 18 h
UHF RTK Base: up to 9.5 h
Static: up to 18 h
External power input9 V DC to 28 V DC
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