C321+ GNSS Smart Antenna

Hemisphere C321+ GNSS Smart Antenna

The C321+ GNSS smart antenna from Hemisphere GNSS can act as a rover to help with construction staking activities and grade control checking, or a base station for your machine control job site. When paired with a Hemisphere SiteMetrix field software platform and Windows based handheld device, the C321+ becomes the ultimate tool to manage all job site activities.



The C321+ multi-GNSS from Hemisphere can be used to manage your site by performing the following jobsite activities:

  • Graphical stakeout
  • Grade management
  • CAD layer management
  • Volume calculations in the field
  • Data collection with enhanced graphics
  • Import/export files for machine control
  • Create localization

The C321+ can be used as a base station sending RTK corrections to existing machine control systems and rovers, or can be tuned into a network rover receiving corrections from a base station at a job site. The C321+ is the ideal receiver to fulfill high-performance satellite positioning needs.


  • Operates as a base station with UHF radio, Network rover, or UHF rover
  • Atlas L-band global corrections
  • Athena RTK engine
  • Satellite-based RTK augmentation

Technical Specifications

Supply voltage:9 to 22V DC external power input with over-voltage protection (5-pin Lemo)
Dimensions:14.1 cm (D) x 14.0 cm (H)
5.5 inches (D) x 5.5 inches (H)
Weight:< 1.38 kg

< 3.05 lbs
Operating temperature:-30 °C to 60 °C (-22 °F to 140 °F)
IP rating:IP67. Protected from temporary immersion to a depth of 1 meter.
Vibration:MIL-STD-810G, method 514.6E-I
Humidity:Up to 100%
Inflammability:UL recognized, 94HB Flame Class Rating (3).
1.49 mm
GNSS Receiver
Receiver type:Multi-Frequency GNSS
Positioning modes:RTK, L-band, DGNSS, SBAS, Autonomous
RTK formats:RTCM3, ROX, CMR, CMR+
L-Band formats:Atlas H100, Atlas H30, Atlas H10
Update rate / Recording interval:Selectable from 1, 2, 4, 5, 10 Hz
(20 Hz available)


The C321+ GNSS Smart Antenna from Hemisphere GNSS is available through Canal Geomatics. If you would like more information about this product, please feel free to get in touch with us by completing the Request Pricing form.