Topcon GRS-1 Mobile GIS Mapping System w/ PG-A1 Antenna

Quick Overview

Topcon GRS-1 GNSS Receiver & Field Controller & PG-A1 Antenna w/ Options
Item ID: X2574-L/T* X2575-L/T*
Condition: Refurbished
Warranty: 90 Day Exchange


* Topcon GRS-1 GNSS Receiver & Field Controller w/ Options... [ID- X2574-L/T*]
          - TopSurv Version 8.2.2
          - Optical
          - GPS+
          - GIS
          - Roads
* Topcon PG-A1 Antenna [ID- X2575-L/T*]
* Topcon Clamp Bracket
* Topcon Antenna Cable
* 4 GB SD Card
* Topcon BC-300 Battery Charger
* Stylus
* QTY. 3 Battery Packs
* QTY. 2 AC Adapter/Chargers
* QTY. 2 Power Cords
* USB PC Interface Cable
* User Manual On Cd-ROM
* Hard Carrying Case


Topcon GRS-1 GNSS Receiver and Field Controller

All-in-one handheld GNSS receiver and field controller

Topcon continues to enhance GNSS receivers by adding Vanguard TechnologyTM to the already successful GRS-1. The GRS-1 now featuring Vanguard TechnologyTM has 226 GNSS channels that use Universal Tracking Technology for unmatched GNSS signal flexibility and expandability. It is an all-in-one handheld GNSS receiver and field controller with high speed processor, bright sunlight readable screen, and optional internal camera. It is packed with communications as well. Bluetooth®, WiFi, and choice of CDMA or GSM modem.

An improved World’s First
The GRS-1 (Geodetic Rover System) was designed as a world’s first fully integrated dual constellation network ready RTK rover. Now with Vanguard TechnologyTM, it can also receive Galileo signals. It still has DGPS capability with the internal single frequency antenna for use in GIS and navigation applications, add the external antenna and connect to your local GNSS network, or MAGNET Relay base for centimeter accuracy RTK performance.

Versatile for all applications
Use the GRS-1 in various configurations from handheld to network enabled RTK measurement, and grade management. The system can be configured to perform at various levels of accuracy that fit any budget. Choose from centimeter level, sub-decimeter, sub-meter, or DGPS. All of these accuracy configurations can be upgraded by a simple options file purchase. The computer processor and screen are powerful and ready to run all of Topcon’s field applications, MAGNET Field, MAGNET Field Site, Pocket-3D, eGIS, and other partner software.

Packed with Communications
Built-in cellular of either a GSM or CDMA modem is included for connection to network RTK base broadcasts. In addition, the built-in Bluetooth® and Wireless LAN (WiFi) connectivity comes standard. Use in a typical hotspot to stay connected. Now with cloud computing and connectivity the GRS-1 is the perfect solution to connect to Topcon’s SiteLink3D and MAGNET Enterprise. Manage jobsites and project teams by staying connected and collaborating on the same data sets.


  • 226 Channels with Universal Tracking Technology
  • Internal GNSS Antenna
  • Internal GSM or CDMA Cellular Modem
  • Windows Mobile® Operating System
  • Built-in Bluetooth® and WiFi


Number of Channels 226 Channels with Universal Tracking Technology
Internal Antennna
DGPS Accuracy

External Antennna

L1 CA, L1/L2 P-code, L2C
L1/L2 CA, L1/L2 P-code
DGPS Accuracy <0.5m
L1,L2 Static H: 3mm + 0.8ppm
V: 4mm + 1.0ppm
RTK Accuracy H: 10mm + 1.0ppm
V: 15mm + 1.0ppm
Data update rate Up to 100Hz
USB Mini Port
Card Slot Secure Digital (SD)
Cellular Capability Internal GSM or CDMA
Input/Output Bluetooth®, USB, Serial, Antenna
Expansion Connector Weatherproof Comm. Port
WLAN Connectivity Standard (Internal, 802.11b)
Processor 806 MHz, XScale PXA320
Operating System Windows Mobile® 6.1
Memory 256MB SDRAM / 1GB Flash
Data Update Rate Up to 100Hz
Display 3.7” VGA LCD
Camera 2.0 Megapixel (optional)
(No camera with GRS-1N)
Compass Internal 4 degree accuracy
Operating Time 5 hours (GPS Static Mode)
Dimensions 8.46” x 3.54” x 2.08”
(215 x 90 x 53mm)
Weight 1.5 lbs (0.7kg)
Environmental IP66, 1 meter drop
Operating Temperature -20°C to 50°C
With Camera -10°C to 50°C
Storage -30°C to 60°C

Topcon PG-A1 Antenna
Topcon continues to lead all GNSS manufacturers with a multitude of new and innovative products. The PG-A1 GNSS antenna continues to compliment the complete line of Topcon GNSS products.

This dual-frequency/dual-constellation, geodetic antenna clearly demonstrates Topcon’s antenna expertise is world class. With precision micro center antenna technology, you have the best design available to achieve the highest horizontal and vertical accuracies. The integrated ground plane also helps eliminate errors caused by multipath.

The PG-A1 antenna is designed to accompany the Topcon modular receivers such as the GB-1000, GB-500, Legacy-E+, and Odyssey-RS as well as the ground breaking GRS-1.


Frequency Dual Frequency GPS + Glonass
Centering Precision Micro Center
Type Microstrip on flat ground plane
Weight 492g
Dimensions 141.6 x 141.6 x 53.7mm
DC Voltage +2.7 ~ +12V; 25 mA @5.0typ.
LNA Gain 30 ± 2dB
Output 50 Ohm
Connector TNC female
Environmental Waterproof
Operating Temp. -40°C ~ +55°C
Shock Resistance 2-meter Pole Drop