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Used Hemisphere S321

Meet the Hemisphere S321+ GNSS Receiver, a game-changer for surveyors. For three consecutive years, it has held the title of Bench-Mark’s premier choice, and its excellence is undeniable. This all-inclusive solution brings the finest high-end GNSS technology within reach, providing all the sought-after features without breaking the bank. Say farewell to budget constraints and welcome an investment that yields quick returns and stands the test of time.

The S321+ delivers multi-constellation GNSS and triple-frequency capabilities, granting access to GPS, GLONASS, Galileo, BeiDou, SBAS constellations, and the potent L5 signal. This translates to unmatched precision, even in challenging canopy-covered terrains. Designed to endure the harshest conditions, it holds an IP67 rating and is built to survive a 2-meter drop. The Athena RTK engine ensures centimeter-level accuracy, featuring various connectivity options for corrections. SureFix technology guarantees precise results, while the Atlas global correction service broadens your horizons. With robust communication capabilities and a user-friendly interface, the S321+ is your gateway to exceptional surveying performance.

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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
  • Free Bench-Mark Approved Technical Support
  • Best Hemisphere Pricing Guarantee



Hemisphere S321 RTK Receiver

Are you ready to elevate your surveying game? The Hemisphere S321+ is here to take your work to the next level. This outstanding GNSS receiver has been Bench-Mark’s top choice for surveying professionals for three years running, and it’s no surprise why.

The Ultimate Surveying Tool: At Bench-Mark, we’re proud to offer the S321+ as the pinnacle of our surveying equipment. This versatile receiver combines all the advanced features you’d expect from high-end GNSS manufacturers, and it won’t break the bank. You don’t need to empty your pockets to own one. The S321+ is not just a tool; it’s an investment that quickly pays for itself and keeps you ahead of the competition for years to come.

Multi-Constellation GNSS and Triple Frequency: The S321+ is your gateway to the world of GNSS precision. With this receiver, you’ll have access to GPS, GLONASS, Galileo, BeiDou, and SBAS constellations—all included as standard, so there’s no need to activate extra satellite constellations. But that’s not all; the S321+ is also a triple-frequency receiver, unlocking the power of the L5 signal. This signal can work wonders in challenging canopy-covered positions, making sure you can capture data in places you couldn’t before.

Surveyor Tough: When the going gets tough, the S321+ gets going. It’s built to withstand accidents, with a surveyor-tough aluminum body that can survive a 2-meter pole drop. The S321+ is designed for longevity and can handle whatever conditions you throw at it, with an IP67 environmental rating that guarantees its resilience.

Athena RTK Engine: Under the hood, the S321+ is powered by the Athena RTK technology, ensuring top-notch RTK performance, whether you’re receiving corrections from a static base station or a network RTK correction system. With multiple connectivity options, you can receive RTK corrections via radio, cell modem, Wi-Fi, Bluetooth, or serial connection. The S321+ delivers centimeter-level accuracy with near-instant initialization and unbeatable robustness, even in challenging environments.

SureFix Technology: With SureFix, you’re always sure that the solution is correct. The S321+ runs two solutions in parallel on the board level, consistently providing you with the right solution with a remarkable 99.999% accuracy. You can rely on this data every time.

Atlas Global Correction Service: Take your precision to a global level with the Atlas correction service. Atlas delivers worldwide centimeter-level correction data via L-band communication satellites. With Atlas, you can achieve sub-decimeter positioning performance anywhere on Earth, without the need to be near a GNSS or communication infrastructure.

Powerful Communication: The S321+ features powerful communication options, allowing you to send and receive corrections via cell and UHF modems. Its internal 1 W Satel radio is one of the best in the industry, providing reliable performance with an optimal range of 10 km. With the internal radio, you may not even need an external base radio. The S321+ also has an internal 4G cell modem, expanding your communication options further. You can send and receive corrections over cell networks, making it one of the top choices for unlimited-range surveys.

User-Friendly and Versatile: On top of all the impressive features, the S321+ also broadcasts a Wi-Fi signal, simplifying setup and updates. The user-friendly Web-UI allows for quick configuration of static data, base, or rover settings, reducing the hassle of setup.

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 not just a tool; it’s your partner for precision surveying. With the S321+, you’re always ahead, ready to tackle challenging environments and consistently deliver exceptional results. Elevate your surveying game with the S321+.

15 reviews for Used Hemisphere S321

  1. Ron Willhoit

    These guys are 5 stars+. I recently rented a pre-owned Hemisphere S321 RTK Base & Rover w/Mesa 2 and FieldGenius 10 and found it to be much faster with a fix solution and enjoyed working with the FieldGenius software. I liked it so much, I bought it! Great support from Renee, the staff, are professional, very knowledgeable and truly care about providing the me “the surveyor” with best price-point purchase for a RTK Systems available. Overall, I am very happy with my purchase, the Hemisphere S321 is quick and accurate and recommend others to get a quote from BenchMark. Most Companies have a slogan, I think BenchMark’s should be “Save Money and Survey Better”.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. Stephen 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.

  9. 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.

  10. 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!

  11. Jamie Bordelon

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

  12. 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.

  13. Benoit B

    The S321 is a great unit.

  14. Peter Llewellyn

    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.

  15. James Kenny

    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.

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