Hemisphere C631 GNSS Smart Antenna



The C631 is Hemisphere’s all-new multi-GNSS, multifrequency smart antenna, designed specifically for dozer, excavator, and sitemetrix survey solutions. The C631 provides robust performance and high precision in a compact and rugged package. With multiple wireless communication ports and an open GNSS interface, the C631 can be used in a variety of operating modes. The built-in web user interface (WebUI) can be used to monitor and control the receiver status and operation, as well as to upgrade the C631 with new firmware and activations. C631 is Athena™-enabled and Atlas®-capable.


  • Multi-frequency GPS, GLONASS, BeiDou, Galileo,
    QZSS, IRNSS, and Atlas L-band
  • Long-range RTK baselines up to 50 km with fast
    acquisition times
  • UHF (400 MHz & 900 MHz), cellular, Bluetooth, and Wi-
    Fi wireless communication
  • Athena GNSS engine providing best-in-class RTK
  • Internal sensor corrects collected point coordinates
    to within 2 cm


  • C631 Smart Antenna with 400MHz & 900MHz Radio
  • C631 Battery (2)
  • C631 Battery Charger
  • Eclipse L-Band Activation
  • Eclipse 10 Hz Activation
  • Raw Data Activation
  • 400 MHz & 900MHz Radio Antenna
  • External Power Cable w/ Alligator Clip
  • I/O Cable w/ USB Host, USB Device, DB9
  • Free Bench-Mark Approved Technical Support
  • Best Hemisphere Pricing Guarantee


The C631 GNSS receiver is powered by Athena RTK technology. With Athena, C631 provides state-of-the-art RTK performance when receiving corrections from a static base station or network RTK correction system. With multiple connectivity options, the C631 allows for RTK corrections to be received over radio, cell modem, Wi-Fi, Bluetooth, or serial connection. C631 delivers centimeter-level accuracy with virtually instantaneous initialization times and cutting edge robustness in challenging environments.

The C631 receiver also enables users to work with Atlas. Atlas is Hemisphere’s industry-leading global correction service, which can be added as a subscription to the C631. Atlas delivers world-wide centimeter-level correction data over L-band communication satellites. With Atlas, C631 users are able to experience sub-decimeter positioning performance anywhere on earth, without the need to be near a GNSS or communication infrastructure.


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