Close this search box.
Close this search box.

Hemisphere C321+ Smart Antenna

The C321+ from Hemisphere GNSS is great for any jobsite and can stand up to even the toughest conditions. The C321+™ is Hemisphere GNSS newest construction survey product that provides the quality one can expect from a North American manufacturer, without the shocking sticker price.

Additional product info

Product details

  • GPS, GLONASS and BeiDou
  • L-Band DGPS Support
  • Internal UHF Radio & Cellular Modem
  • Surveyor Tough Magnesium Housing
  • 4GB Internal Memory, with Expandable SD Memory Slot
  • Dual Bluetooth
  • Hot Swappable Long Life Batteries

Package includes

  • C321+ Smart Antenna with 400MHz radio
  • C321+ TNC Cable & Bracket
  • C321+ Battery (2)
  • C321+ 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 Hemsiphere C321+ GNSS Receiver

The Hemisphere C321+, is he construction version of what has been Bench-Mark’s best-selling surveying receiver for the past three years, the Hemisphere S321+. This is the best all around piece of equipment we have to offer here at Bench-Mark. This is the receiver that has all of the features of the highest end GNSS manufacturers at a price that is actually reasonable. There is no need to pilfer your coffers in order to pay for this unit. The C321+ is designed to quickly pay itself back, and is designed to last you for years to come. This is the network rover that will keep you ahead of the competition for years to come.


Multi Constellation GNSS and Triple Frequency

The C321+ is Hemisphere’s multi-GNSS, multi-frequency smart antenna. With the Hemisphere C321+ 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 C321+. To add to this, the C321+ is also triple frequency. With a triple frequency receiver you have access to the most powerful GNSS signal yet L5. The L5 signal allows you to get performance otherwise impossible with traditional signals, in canopy positions. The L5 signal is powerful enough to get through tree canopies, allowing you to get shots that you would otherwise not have been able to get.


Surveyor Tough

The C321+ provides robust performance and high precision in a compact and rugged package. With a surveyor tough aluminum body, the C321+ is built to withstand whatever conditions you throw at it. The C321+ 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 C231+ 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 C321+ receiver is powered by Athena RTK technology. With Athena, C321+ 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 C321+ allows for RTK corrections to be received over radio, cell modem, Wi-Fi, Bluetooth, or serial connection. C321+ delivers centimeter-level accuracy with virtually instantaneous initialization times and cutting-edge robustness in challenging environments.


The C321+ 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 C321+. Atlas delivers world-wide centimeter-level correction data over L-band communication satellites. With Atlas, C321+ 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 C321+ 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 C321+’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 C321+ 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 C321+ 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 C321+ 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 Features

  • RTK Base station with internal UHF radio
  • UHF RTK rover
  • Network RTK rover
  • Multi-GNSS including GPS, GLONASS,BeiDou, QZSS, Galileo, SBAS, and L-band
  • Athena™ RTK engine and Atlas® GNSS Global Correction Service
  • Dual hot-swappable lithium batteries provides 12 hours of battery life
  • aRTK™ capabilities – Satellite-based RTK augmentation


There are no reviews yet.

Be the first to review “Hemisphere C321+ Smart Antenna”

Your email address will not be published. Required fields are marked *