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Quick Overview

The GRX1 GNSS receiver fully integrates GPS+GLONASS receiver and antenna, digital UHF modem, GSM/GPRS module, Bluetooth® module and detachable battery into a compact and rugged magnesium alloy body.

Item ID: GRX1\
Condition: Used
Warranty: 90 Day Exchange


Sokkia GRX1 GNSS Receiver


Sokkia GRX1 GNSS Receiver

Sokkia GRX1 receiver brings a new level of flexibility into precision GNSS applications. Whether it’s used for RTK base or rover, for network RTK rover or even as a static receiver, the GRX1 provides unmatched usability and convenience that increases field work efficiency on every job site.

The GRX1 GNSS receiver is a fully integrated GPS & GLONASS receiver and antenna, digital UHF modem, GSM/GPRS module, Bluetooth® module and detachable battery into a compact and rugged magnesium alloy body.


Fully Scalable Composition

GRX1’s scalable architecture will maximize allow you to return on investment. You start with an L1 GPS receiver with minimal initial costs, which can be upgraded to L1 GPS+GLONASS, to L1/L2 GPS, up to 72-channel L1/L2 GPS+GLONASS receiver at any time you need.  


Maximum Versatility in RTK Applications

Utilizing full wireless connectivity and the Sokkia-invented voice navigation system, the GRX1 dramatically facilitates the use of both RTK and network RTK technologies.

  • Built-in GSM/GPRS modem makes the GRX1 an ideal rover receiver for network RTK positioning.
  • The GRX1 can be used for both private RTK base and RTK rover using internal digital UHF modem without any extra device.
  • It also supports network RTK where the correction data is broadcasted by UHF radio.
  • Voice messages notify the users when RTK is fixed or lost, or other problems occur. This feature dramatically increases work efficiency by eliminating a need for repeated checks with the controller display.



Tracking capability
Number of channels 72 channels
Tracked signals GPS: L1 CA, L1/L2 P-code, L2C
GLONASS: L1/L2 CA, L1/L2 P-code
Positioning accuracy
Static L1+L2: H: 3mm + 0.5ppm V: 5mm + 0.5ppm
L1 Only: H: 3mm + 0.8ppm V: 4mm + 1ppm
Fast static L1+L2: H: 3mm + 0.5ppm V: 5mm + 0.5ppm
Kinematic L1+L2: H: 10mm + 1ppm V: 15mm + 1ppm
RTK L1+L2: H: 10mm + 1ppm V: 15mm + 1ppm
DGPS <0.5m
User interface
Operation Single-button operation for power, receiver reset, memory initialization
Display panel 22 LED status indicators
Voice navigation Multi-lingual voice messages for receiver status information
Data management
Memory SD/SDHC card (FAT16/32 formats)
Data format RTCM SC104 2.1/2.2/2.3/3.0/3.1, CMR, CMR+, NMEA, TPS
Update/output rate 1Hz, 5Hz, 10Hz, 20Hz
Communication port RS-232C (4,800 to 115,200bps)
Wireless communication
Bluetooth modem V.1.1, Class 1, 115,200bps
Digital UHF modem Internal, receiver (RX) and transmitter (TX), 410 to 470MHz
GSM/GPRS modem Internal
Dust and water protection IP67 (IEC 60529:2001) at closing all connector caps. Protected against temporary immersion up to 1m (3.3ft.) depth.
Shock 2m (6.56ft.) pole drop
Operating temprature GRX1 receiver: -40 to +65°C (-40 to +149°F)
BDC58 battery: -20 to +65°C (-4 to +149°F)
UHF/GSM modems: -20 to +55°C (-4 to +131°F)
Storage temperature -45 to +70°C (-49 to +158°F)
Humidity 100%, condensing
Enclosure Magnesium alloy housing
Size Dia. 184 x H 95mm (dia. 7.24 x H 3.74 in.)
Weight GRX1 receiver: 1.1kg (2.43 lb.)
BDC58 battery: 195g (6.9 oz.)
Internal Modems: 115 to 230g (4.1 to 8.2 oz.), depending on modem specifications