Hemisphere S621 GNSS Smart Antenna


The S621 is Hemisphere’s all-new multi-GNSS, multifrequency smart antenna. The S621 provides robust performance and high precision in a compact and rugged package. With multiple wireless communication ports and an open GNSS interface, the S621 can be used in a variety of operating modes. Use the S621 as a precise base station sending RTK to your existing rover network. Turn S621 into a lightweight and easy to use rover by connecting it to your base via UHF radio or cellular network. 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 S621 with new firmware and activations. S621 is Athena™-enabled and Atlas®-capable (subscription required).


  • 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


  • S621 Smart Antenna with 400MHz & 900MHz Radio
  • S621 Battery (2)
  • S621 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 S621 GNSS receiver is powered by Athena RTK technology. With Athena, S621 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 S621 allows for RTK corrections to be received over radio, cell modem, Wi-Fi, Bluetooth, or serial connection. S621 delivers centimeter-level accuracy with virtually instantaneous initialization times and cuttingedge robustness in challenging environments.

The S621 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 S621. Atlas delivers world-wide centimeter-level correction data over L-band communication satellites. With Atlas, S621 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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