Home » Products » (1.2) Used Hemisphere S321+ GNN RTK (6th Gen.) Network Rover w/ Hemisphere CW400 & FieldGenius

(1.2) Used Hemisphere S321+ GNN RTK (6th Gen.) Network Rover w/ Hemisphere CW400 & FieldGenius


The Hemisphere S321+ has been our most popular receiver for the last three years. Built to last in a tough metal enclosure, the S321+ is built to last you for years. Every used receiver is range tested, and has all the latest firmware. Call us today for the exact details on the used equipment available.


  • Free Firmware Upgrades
  • Free Technical Support
  • Unbelievable Performance under Canopy and Near Buildings
  • Multi GNSS; GPS, GLONASS, Galileo and BeiDou
  • Atlas DGPS Support
  • Cellular Modem
  • Long Range Internal Satel Radios
  • Surveyor Tough Magnesium Housing
  • SureFix & aRTK Intelligence for RTK
  • 4GB of Internal Storage
  • Long Life Batteries
  • Only Weighs 3 lbs


  • S321 GNSS Network Rover
  • Rover Pole
  • Carlson RT3 Data Collector with SurvPC GPS
  • Pole Clamp and Claw
  • Pelican Case
  • GPS Quick Release


See What Matters to Our Customers

Multi Constellation GNSS and Triple Frequency

The S321 is Hemisphere’s multi-GNSS, multi-frequency smart antenna. With the Hemisphere S321 you receive corrections from; GPS, GLONASS, Galileo, BeiDou, and SBAS constellations at no extra charge. There is no need to activate the extra satellite constellations, they all come standard with the Hemisphere S321.

Surveyor Tough

The S321 provides robust performance and high precision in a compact and rugged package. With a surveyor tough aluminum body, the S321 is built to withstand whatever conditions you throw at it. The S321 is built to survive a 2 M pole drop. This is the receiver that is built with accidents in mind, and is built to survive them. The IP67 environmental rating means that Hemisphere’s S231 can withstand whatever conditions you face on site. This is the receiver that is built to last for years to come, and has the technology to compete that long as well.


Athena RTK Engine

The S321 receiver is powered by Athena RTK technology. With Athena, S321 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 S321 allows for RTK corrections to be received over radio, cell modem, Wi-Fi, Bluetooth, or serial connection. S321 delivers centimeter-level accuracy with virtually instantaneous initialization times and cutting-edge robustness in challenging environments.


The S321 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 S321. Atlas delivers world-wide centimeter-level correction data over L-band communication satellites. With Atlas, S321 users are able to experience sub-decimeter positioning performance anywhere on earth, without the need to be near a GNSS or communication infrastructure.


Atlas L-band has the following benefits:

  • Positioning accuracy – Competitive positioning accuracies down to 2 cm
    RMS in certain applications.
  • Positioning sustainability – Advanced position quality maintenance in the
    absence of correction signals, using Hemisphere’s patented technology.


Powerful Communication

The S321 features the ability to send and receive corrections over both cell and UHF modems. The powerful 1 W internal Satel radio is one of the best in the industry. With an optimal range of 10 km, you barely have the need for an external base radio. This is the receiver that has the radio power to get every survey done. In fact the S321’s internal Satel radio is the best performing radio on Bench-Mark’s Range Test Baseline. Over 3.5 km with no line of site, the internal radio of the S321 has no issues receiving corrections and calculating a fixed position. Once we step out of the truck, the receiver nearly instantly fixes. Every other receiver we have tested on this baseline, has had some range issues. This is the ultimate internal radio.


The internal 4G cell modem also allows you to send and receive corrections over cell. The S321 is one of our favourite receivers to use on our own StormCaster internet RTK service. With Stormcaster you can set up a permanent base at the office and as long as you have cell service, survey with unlimited range. With an internal cellular modem, you can run an an unlimited amount of rovers of the same base at multiple different job sites.


On top of the above mentioned communication options, the S321+ also broadcasts a Wifi signal over which setup and updates can be applied. With the Web-UI you can quickly set up static data, a base and a rover with little to no hassle. This is the receiver that has an option for any kind of way you want to work.


Key S321+ Features

  • Multi-Frequency, Multi-GNSS Base Station/Rover
  • GPS, GLONASS, BeiDou, Galileo, and QZSS
  • Athena™ RTK, Atlas® L-Band, and SBAS-Capable
  • Hot Swappable Batteries with 12 Hours of Combined Life
  • Wifi, UHF, Cellular and Bluetooth Communication
  • 8 GB of Internal Memory for Data Logging, Downloading, and Uploading
  • 572 Channels
  • 1, 2, 4, 5, or 10 Hz Update Rate (20 Hz Optional)
  • Internal Radio (410 – 470 MHz)


The Whole Package

Hemisphere’s S321 and CW400 is a modern surveying package. With the fully loaded Hemisphere S321 you get a modern receiver that has all of the tools to make your survey as easy is possible. With Multi-constellation and multi-frequency capability, the S321 is the receiver that is built to last you for years to come. With the magnesium body, you can always be assured that antenna is ready to go when you are.


There are no reviews yet.

Be the first to review “(1.2) Used Hemisphere S321+ GNN RTK (6th Gen.) Network Rover w/ Hemisphere CW400 & FieldGenius”

Your email address will not be published.