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Used Hemisphere S321

Introducing the Hemisphere S321+ GNSS Receiver, a groundbreaking tool transforming the surveying landscape. Recognized as Bench-Mark’s top choice for three consecutive years, its unparalleled excellence is undisputed. This comprehensive solution revolutionizes access to top-tier GNSS technology, integrating sought-after features without straining budgets. Bid adieu to financial constraints and embrace an investment that promises swift returns and enduring reliability.

The S321+ boasts multi-constellation GNSS and triple-frequency capabilities, tapping into GPS, GLONASS, Galileo, BeiDou, SBAS constellations, and the potent L5 signal. This amalgamation ensures unparalleled precision, even amidst challenging canopy-covered terrains. Engineered to withstand extreme conditions, it proudly holds an IP67 rating and endures a 2-meter drop without faltering. The Athena RTK engine guarantees centimeter-level accuracy, offering diverse connectivity options for corrections. SureFix technology reinforces precise results, complemented by the expansive reach of the Atlas global correction service. Armed with robust communication interfaces and a user-centric interface, the S321+ stands as the gateway to exceptional surveying performance.

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S321 Options

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Product details

  • GPS, GLONASS and BeiDou
  • SMS Communication from Base to Rover & Cell Phone
  • L-Band DGPS Support
  • Internal UHF Radio & Cellular Modem
  • Surveyor Tough Magnesium Housing
  • SureFix & aRTK Intelligence for RTK
  • 4GB Internal Memory, with Expandable SD Memory Slot
  • Dual Bluetooth
  • Long Life Batteries

Package includes

  • S321+ Smart Antenna with 400MHz radio
  • S321+ Battery (2)
  • S321+ Battery Charger
  • Eclipse L-Band Activation
  • Eclipse 10 Hz Activation
  • Raw Data Activation
  • 400 MHz 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 Hemisphere S321+

The Hemisphere S321+ was Bench-Mark’s top-selling surveying receiver until the release of the S631, a consistent favourite of surveyors. At the time of its release it was one of the most versatile and powerful RTK receivers on the market, and encompassed all the cutting-edge features found in high-end GNSS technology, all at a price that makes sense. With the S321+, there’s no need to deplete your budget; this receiver offers a rapid return on investment and longevity that ensures it remains your trusted companion for years to come, keeping you consistently ahead of the competition.

Multi-Constallation GNSS and Triple Frequency: The S321+ is Hemisphere’s multi-GNSS, multi-frequency smart antenna, providing access to GPS, GLONASS, Galileo, BeiDou, and SBAS constellations, all included as standard. No need to activate extra satellite constellations. Furthermore, it’s a triple-frequency receiver, unlocking the power of the L5 signal, which empowers you to achieve performance levels previously unattainable with traditional signals, even in challenging canopy-covered positions. The L5 signal’s strength allows it to penetrate tree canopies, enabling you to capture data from otherwise inaccessible locations.

Built Tough for Surveyors: The S321+ is built to thrive in harsh conditions, encased in a robust aluminum body that can withstand accidental drops of up to 2 meters. It’s designed with accidents in mind and primed to endure. Its IP67 environmental rating ensures it can tackle any field conditions, making it a long-lasting investment that can stand the test of time.

Athena RTK Engine: Powered by Athena RTK technology, the S321+ offers state-of-the-art RTK performance, whether receiving corrections from a static base station or network RTK correction system. With multiple connectivity options, including radio, cell modem, Wi-Fi, Bluetooth, or serial connection, the S321+ delivers centimeter-level accuracy with near-instantaneous initialization and robustness, even in challenging environments.

The S321+ also boasts SureFix technology, ensuring that you consistently obtain the right solution. It runs parallel solutions on the board level, guaranteeing the correctness of your solution with a remarkable 99.999% accuracy. This is the reliable data you can count on every time

Global Corrections with Atlas: The S321+ opens the door to Hemisphere’s Atlas correction service. Atlas provides worldwide centimeter-level correction data via L-band communication satellites. With Atlas, S321+ users can achieve sub-decimeter positioning performance anywhere on Earth, without the need for GNSS or communication infrastructure nearby.

Powerful Communication: The S321+ is equipped with the ability to send and receive corrections via both cell and UHF modems. Its internal 1 W Satel radio is among the best in the industry, boasting an optimal range of 10 km, reducing the need for an external base radio. This internal radio excels in challenging conditions and ensures corrections are received and positions are fixed even in non-line-of-sight situations. It’s the ultimate internal radio.

The internal 4G cell modem expands communication options, enabling corrections to be sent and received via cellular networks. The S321+ is a preferred choice for our StormCaster internet RTK service, allowing for unlimited-range surveys as long as you have cell service. With an internal cellular modem, multiple rovers can operate from a single base at various job sites, making it exceptionally versatile.

In addition to the communication options mentioned, the S321+ broadcasts a Wi-Fi signal for easy setup and updates. With the user-friendly Web-UI, configuring static data, a base, or a rover becomes hassle-free. The S321+ accommodates the way you prefer 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 Hemisphere S321+ GNSS Receiver is more than a device; it’s your partner for precision surveying, designed to tackle the most demanding environments and consistently deliver exceptional results. With the S321+, you’re always a step ahead.

14 reviews for Used Hemisphere S321

  1. Benoit B.

    The S321 is a great unit.

  2. Peter Llewellyn – DGH Engineering Ltd.

    A great unit. Did even better near trees compared to other GNSS Equipment I’ve used in the past. I will definitely recommend it to others.

  3. James Kenny – Pasquini & Associates Consulting

    Just an update, well Rene it’s the best built GPS I’ve ever used, I’m completely impressed with the design, the radio is way better now, and since the S321 firmware update it’s repeatability and accuracy has been dead on!

    Also this Mesa2 works awesome in every aspect daylight, it’s viewability is like nothing else on the market and in wet conditions the screen works flawlessly.

  4. Adam Batschelet

    Excellent team to work with. We recently ordered a S321+ base and rover for RTK UAV surveys. Rene was fantastic to work with, our system was shipped one day after putting the order in and arrived promptly. System works perfect and was exactly what we needed. Communication from Benchmark is great and they have been a pleasure to work with. Highly recommend Rene and his team.

  5. Roger St. Amand

    Rene and the folks at Benchmark have provided excellent service both during and after the sale to get us set up with the Hemisphere S321+ system. Very responsive, and knowledgeable. So far we are happy with the equipment and very satisfied with the service.

  6. Sid Sandback

    We purchased the Hemisphere S321 this summer and have never looked back. We use it extensively for Equipment Construction Foundation Layout. I was able to quickly and accurately layout 130 pile locations and footings for the entire conveyor support system in our project. This includes x – y coordinates and also elevations. Forming locations and insert locations within millimeters. We found the S321 to be a ‘Game Changer’
    Rene and the staff at Bench-Mark were beyond helpful to make that learning curve as short as possible. They stand behind their equipment to the fullest as well. Much appreciated.

  7. Jeff Brown

    Recently, the company I work for purchased equipment from Bench Mark Equipment and Supplies Inc. which included the Hemisphere S321 GNSS Smart antenna, base station and the Field Genius 10 software package. When we first started using the equipment we incurred some challenges initializing the equipment. The Technical Support Team not only provided a timely response, but the advice provided was very thorough and accurate. Through problem solving at both ends, we learned that there was a small issue with the factory settings. This was resolved quickly.
    I would highly recommend purchasing equipment from Bench Mark Equipment and Supplies Inc., they are extremely professional and helpful.

  8. Carlos Alvarez

    Rene and his team at Bench Mark have excellent customer service, before buying the S321 and improved after having bought it, always with solutions to all the doubts we have had with the S321, because at the time of purchase we had no experience in gnss. We are grateful for the freedom we feel to ask when every question arises and for the quick response.

  9. Surfer Stuf

    I upgraded my complete RTK system with Rene and the boys at Bench-Mark. Great dealing on the trade-in, knowledgeable support, and well worth getting into Hemisphere’s S321 receivers. A good survey company is better now.

  10. Steven Lane

    An excellent Company providing responsive service. I particularly appreciate the capability of the S321 RTK system. A very quick and responsive GPS system that acquires an accurate fix even in difficult bush conditions. Equipment up grades are easy to do and customer support is readily available.

  11. Andy MacDonald

    The Bench Mark team has great customer service and we have had good experiences using the Hemisphere S321 unit in our coastal and precision agriculture work.

  12. Trent Kaczur

    Bench Mark outfitted our company with the Hemisphere S321 GPS Base and Rover to fulfill our construction survey needs. Rene and his staff make themselves available to answer any questions our company may have about the gear in order to keep our work moving forward. Thanks Bench Mark!

  13. Jamie Bordelon

    Very good experience purchasing my Hemisphere S321. The team at Benchmark was very knowledgeable and the product works great!!

  14. Rob Camirand

    For the past few years, I have been utilizing the S.321+ unit, transitioning from a different model. My primary application of this device has been in establishing ground control for UAV-based photogrammetry and LiDAR operations. Throughout this period, the S.321+ has demonstrated exceptional performance and reliability. Additionally, the support and assistance provided by the staff at Benchmark have been commendable. Based on my experience, I confidently recommend the S.321+ for professionals in similar fields seeking a dependable and efficient solution.

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