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Stonex S990+ GNSS RTK Rover with Tilt Compensation


The Stonex S990+ GNSS RTK rover is a 1408-channel receiver featuring characteristics that improve survey performance in the field. The S990+ receiver is equipped with all major connectivity features: Bluetooth, Wi-Fi, UHF radio and 4G modem.



The Stonex S990+ GNSS RTK rover is a high-performance receiver designed for surveying applications. Equipped with 1408 channels, the S990+ can provide real-time navigation solutions with high accuracy, supporting all major GNSS constellations including GPS, GLONASS, BeiDou, Galileo, and QZSS.

The S990+ features multiple connectivity options, including Bluetooth, Wi-Fi, UHF radio and 4G modem, ensuring reliable data flow to the controller. With an internal 10,200 mAh battery, the S990+ can operate for up to 9 hours and can be recharged via a USB Type-C connector.

The IMU system supports tilted measurement (TILT) with quick initialization, providing accurate surveys even in challenging conditions.
The color touch display and Web UI offer complete control of the receiver, while the 1PPS port ensures precise timing for multiple
facilities and systems integration.

The S990+ also offers an optional double-frequency UHF radio and 4G modem, making it suitable for use in different countries.


  • 1408 channels GNSS board capable of supporting multiple satellite constellations
  • Integrated IMU system that allows tilted measurements
  • Optional UHF double frequency radio, 410-470 MHz and 902.4-928 MHz
  • Internal 4G modem that operates with all world signals
  • Convenient color touch display
  • IP67 certified for use in rugged conditions

Technical Specifications

Board: Unicore UM980
Channels: 1408
GPS: L1 C/A, L1C*, L2P, L2C, L5
Galileo: E1, E5a, E5b, E6
BeiDou: B1I, B2I, B3I, B1C, B2a, B2b*
QZSS: L1, L2, L5
Update Rate: 20Hz
Memory: 32 GB
Static Survey: 2.5 mm + 0.1 ppm RMS (Horizontal)
3.5 mm + 0.4 ppm RMS (Vertical)
RTK (< 30 Km): 5 mm + 0.5 ppm RMS (Horizontal)
10 mm + 0.5 ppm RMS (Vertical)
Code Differential: 0.25 m + 1 ppm RMS(Horizontal)
V 0.50 m + 1 ppm (Vertical)
SBAS Accuracy: 0.60 m RMS
Internal UHF Radio
Model: TRM 121
Type: Tx – Rx
Frequency Range: 410 – 470 MHz
902.4 – 928 MHz
Channel Spacing: 12.5 KHz / 25 KHz
Transmission Power: 1 watt
Maximum Range: 3-4 km in urban environment
Up to 10 km with optimal conditions
Size: Φ151mm x 94.5mm
Weight: 1.30 kg
Operating Temperature: -40 °C to +65 °C (-40°F to 149°F)
Storage Temperature: -40 °C to +80 °C (-40°F to 176°F)
Waterproof/Dustproof: IP67
Shock Resistance: Designed to endure a 2 m pole drop onto a concrete floor with no damage
Vibration: Vibration Resistant
Power Supply
Battery: Rechargeable 7.2 V – 10.2 Ah
Voltage: 9 to 28 V DC external power input with over-voltage protection (5 pins Lemo)
Working Time: Up to 10 hours
Charge Time: Typically 4 hours


  • B10+150215 – Stonex S990+, GNSS, 1408Ch, 4G, WiFi, BT, IMU, 1PPS, Bundle
  • 40-450224 – S990+ UHF firmware activation


Why Buy from Us?

In business since 2004, Canal Geomatics is an authorized dealer for Stonex and has established itself as an industry-leading distributor of high-precision positioning products in North America. Our mission is to find the best solution for each unique application and extend premium support to ensure the long-term success of our customers. We offer both volume and reseller discounts for the majority of our product lines.


The S990+ GNSS RTK rover from Stonex is available through TerrisGPS. If you would like more information about this product, please feel free to get in touch with us by completing the Request Pricing form.

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Client Testimonials

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"Thank you for your prompt service. All seems to be working well again. Your techs were very helpful with the troubleshooting."
J.O. - Ground Navigation
"Thanks for all the troubleshooting help, also to John for his assistance and the prompt answers from you guys!"
F.A. - Survey Industry

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