RTK GNSS Receiver and Field Controller featuring 226 Channels with Universal Tracking

Topcon Positioning System’s GRS-1 (Geodetic Rover System) is an all-in-one handheld GNSS receiver and field controller featuring Topcon's exclusive Vanguard chip technology, compass and optional built-in camera. Other features include internal L1 antenna for GIS and navigation uses, internal modem and optional external antenna for GNSS network compatibility, or instantly change to dual constellation for centimeter accuracy RTK. Even use your GRS-1 as a static post-processed receiver solution.

Most importantly, the GRS-1 provides flexibility to fit you and your jobs by providing an SD memory card slot for up to 1GB Flash memory, optional internal GSM or CDMA modem, wireless LAN connectivity, and Bluetooth® wireless technology. The bright, high-contrast touch screen with virtual keyboard makes using Topcon's MAGNET or Pocket-3D software quick and easy.


Features include:

  • Vanguard chip technology featuring 226 Channels with Universal Channels
  • Hybrid Positioning capable
  • Internal GSM or CDMA Cellular Capability
  • 806MHz XScale Processor
  • Windows Mobile® 6.1 Operating System
  • 2.0 Megapixel Camera (optional)
  • 256MB SDRAM, 1GB Flash
  • Internal Magnetic Compass
  • Built-in Bluetooth® and Wireless LAN connectivity
Integrated Technology
Vanguard technology is Topcon’s new, cutting edge 226-channel ASIC tracking all current and upcoming GNSS constellations and signals with superior performance, accuracy and sensitivity.

Find out more...

Optional Technology
NEW Hybrid Positioning
Topcon's unique Hybrid Positioning solution combines GNSS, optical, and automated data workflow to offer the ultimate in flexible, non-stop productivity. With the precision and tracking of Topcon’s Robotic Total Stations, realize precise measurements anywhere the prism can be seen. Once the robot loses “line of sight”, switch to GNSS positioning using GRS-1 RTK and a PL-S1 antenna mounted above the prism on the rover pole. With the GRS-1 running MAGNET Field you’ll have the perfect balance between large screen viewing and all-day handheld productivity. Even better, using Topcon’s MAGNET Enterprise and Hybrid Positioning you’ll realize real-time data flow / data exchange with your office. Find out more here...
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Number of Channels 226 Universal Channels
CORS Beacon Yes with BR-1
DGPS Accuracy 50cm HRMS
L1 Static Function H: 3mm + 0.8ppm (x baseline length)
V: 4mm + 1.0ppm (x baseline length)
L1, L2 Static Function H: 3mm + 0.5ppm (x baseline length)
V: 5mm + 0.5ppm (x baseline length)
Real time RTK Accuracy H: 10mm + 1.0ppm
V: 15mm + 1.0ppm
Onboard Software TopSURV
Office Software (post processing) Topcon Tools™, SurveyMaster
Microprocessor XScale PXA320
Processor Speed 806MHz
Operating System Windows® Mobile 6.1
Data Update/Output Rate 1Hz – 100Hz Selectable*
Memory 256MB SDRAM
1GB Flash
USB Mini Port
Card Slot SD
Cellular Capability Internal GSM or CDMA**
Input/Output Bluetooth®, USB, Serial, ANT, and Power
Wireless LAN Connectivity Standard (Internal, 802.11.b)
Magnetic Compass Internal, 4 degree accuracy
Expansion Connector Weatherproof Communication Port
Battery Life 5 hrs while in GPS static mode
Battery Type 2500mAh Removable, Li-Ion Rechargeable
Dimensions 3.54"w x 8.46"h x 2.08"d (90mm x 215mm x 53mm)
Weight 1.5 lbs (0.7kg)
Display 3.7” VGA LCD
Built-in Camera 2.0 Megapixel
Keyboard 3 Key plus Virtual Keyboard
Waterproof IP66
Drop 1 meter
Operating Temperature -20° to 50°C
Operating with camera -10° to 50°C
Storage Temperature -30° to 60°C

*Data rates from 10 - 100hz and higher available as option
**GSM/CDMA available as factory options
† RMS Value unless otherwise specified. Accuracy will vary depending on the number of satellites used, obstructions, satellite geometry (PDOP), occupation time, multipath effects, and atmospheric conditions. Performance may be degraded in conditions with high Ionospheric activity, extreme multipath, or under dense foliage. For maximum system accuracy, always follow best practices for GNSS data collection.


1:22 min.

Fast-paced promotional video highlighting the main features of Topcon’s World's First all-in-one, handheld, dual frequency GNSS Receiver and Field Controller, the GRS-1.



GRS-1 with Pocket-3D
June 02 2014
GRS-1 Brochure
August 09 2013