UNI-GR2 RTK GNSS receiver

Anyone can survey with centimetre accuracy

The UNI-GR2 is our most universal RTK GNSS receiver. Six constellations, many frequencies and open interfaces give you a centimetre-accurate fix in almost any environment, and let you connect it to the tools you already use.

per receiver, excl. VAT

One receiver, built for the field

Rugged, waterproof and accurate. Connect any phone or tablet to the UNI’s Wi-Fi hotspot and run UNI-Collect, or the software of your choice. The UNI-GR2 also connects over Bluetooth, serial, USB, 4G and LoRa, so it fits the way you already work.

marXact UNI-GR2 RTK GNSS Receiver
  • 1408Channels, six constellations
  • 8 mmRTK horizontal, plus 1 ppm
  • 10,400 mAhBattery, charges over USB-C
  • 10+ hoursUp to a full working day
  • 800 gReceiver on the pole
  • IP67Waterproof, -20 to +55 °C

Six constellations

GPS, GLONASS, Galileo, BeiDou, QZSS and NavIC on many frequencies, with SBAS support for a reliable fix. 1408 channels in one receiver.

Works as rover and base

Run it as a rover on UNI-RTK Premium, or set it up as a base to feed corrections to another UNI. Both work out of the box.

Use any controller

Connect any phone or tablet to the UNI’s Wi-Fi hotspot and run UNI-Collect. Drop in a SIM and the receiver uses 4G in the field.

Use the software you like

Run UNI-Collect on your own phone or tablet, or pair the receiver with the software you already use. Open interfaces and a standard NMEA output keep the choice yours.

Ready for any environment

IP67 waterproof and rated from -20 to +55°C. It keeps measuring in rain, dust and cold.

Gets you through the day

A built-in 10,400 mAh battery runs 10+ hours, up to a full working day. At 800 grams it stays light on the pole.

Trusted by 1000+ companies

More than 10 million objects measured, in more than 40 countries.

Technical specifications

Everything under the hood

GNSS receiver

Channels1408
GPSL1C/A, L1C, L2P(Y), L2C, L5
GLONASSG1, G2, G3
GalileoE1, E5a, E5b, E6
BeiDouB1, B2, B3
QZSSL1C/A, L1C, L2C, L5
NavICL5
SBASWAAS / EGNOS / GAGAN / MSAS

Accuracy (RMS)

Standalone horizontal1.5 m
Standalone vertical2.5 m
DGPS horizontal400 mm
DGPS vertical800 mm
Static horizontal3 mm + 1 ppm
Static vertical6 mm + 1 ppm
RTK horizontal8 mm + 1 ppm
RTK vertical15 mm + 1 ppm

Connectivity

12-pin connectorCharging, RS232, CAN, Host USB, PPS, Event
USB-CUSB Power Delivery, charging, data transfer
4G mobile dataLTE, EDGE, GPRS, GSM, HSDPA+ UMTS
Wi-Fi802.11 a/b/g/n/ac
Bluetooth4.2
NFCYes
RadioLoRa 868 / 915 MHz

Mechanical & performance

Level and tilt9DOF level LED ring and tilt compensation to 45°. Tilt accuracy 10 mm + 0.7 mm per degree.
Internal battery10,400 mAh
Battery life10+ hours (up to 12 h)
Weight800 g
Water & dust proofIP67
Operating temperature-20 to +55 °C
Position outputNMEA-0183
Part of the marXact system

The UNI-GR2 fits straight into our packages

Buy the receiver on its own, or as part of a complete set. The UNI-GR2 sits at the heart of all three, and works with UNI-Cloud and UNI-RTK Premium either way.

Site worker placing a marXact UNI-GR2 GNSS receiver on a survey pole on a construction site

Digital surveying

UNI-Collect Survey Package

complete survey package, excl. VAT

The UNI-GR2 with tablet, mount and pole, plus a year of UNI-Cloud, support and UNI-RTK Premium. Everything you need to start surveying.

Fibre optic cables in an open trench captured in 3D with LiDAR

3D scanning

UNI-Collect 3D Package

complete 3D package, excl. VAT

The UNI-GR2 with an iPad Pro and LiDAR, so you capture point clouds and 3D detail alongside your normal survey work.

Surveyor with a UNI-GR2 next to an excavator fitted with UNI-Machine 3D GPS machine control

Machine control

UNI-Machine Control

from complete excavator package, excl. VAT

Two UNI-GR2 receivers, machine sensors and a control box, so the operator sees exactly where to dig without waiting for a surveyor.

WHAT IT DOES

Everything the receiver does, grouped

Survey, set out, import, export and share, with the UNI-GR2 in UNI-Collect and UNI-Cloud. What is not there yet is marked as such.

Measure

  • Points, lines and areas, with offsets on all three.
  • Enter a point by hand.
  • Length in 2D and 3D, per segment and the angle to the previous one.
  • Area, and volume over a surface.
  • Averaging over a set recording time.
  • Your own pole height, and tilt compensation up to 45 degrees.

Set out

  • Points, lines and areas.
  • A direction arrow to the target point.
  • Values to the centimetre.
  • A warning when accuracy drops.
  • Save what you set out, or update the existing point.

Import and export

  • In: CSV, TXT, DXF, DWG, LandXML, GeoJSON, KML and ESRI Shapefile, or a ZIP with a set of files.
  • A full AutoCAD drawing with automatic layer mapping, names and colours kept.
  • Out: DWG, DXF, LandXML, CSV, TXT and GeoJSON, in 2D or 3D.
  • Per layer, or the whole project at once.

Background and reference data

  • Cadastral lines for the Netherlands, Belgium and Germany.
  • Large drawings as a fast background layer, in the field and in the cabin.
  • WMS layers supplied by us on Professional, your own source on Ultimate.
  • A coordinate system per country, set when you create the project.
  • Transformation grids on the tablet.

Photos and 3D

  • Photos on a point or a shape, with EXIF, syncing on their own.
  • LiDAR 3D scanning with an iPad Pro, with the UNI-GR2 for accuracy.
  • Scans and photos on the map in UNI-Cloud, in a 3D viewer.
  • Photos and scans land on the map on the centimetre, on the position of the UNI receiver, not on the tablet's own GPS.

Share and work together

  • A public project link or a QR code, no account needed on the other side.
  • Users, groups and rights.
  • Real-time sync.
  • An API and WebSockets for your own integration.

Coming soon: basic CAD drawing in UNI-Cloud. PDF reports are in the works.

KLIC (NETHERLANDS)

KLIC notifications in the field and on the map

Your KLIC data sits in the same project as your measurements, in the field and in the office.

  • KLIC viewer as a layer over your project in UNI-Cloud.
  • Open and download KLIC documents from UNI-Cloud.
  • Use imported GeoJSON as a KLIC layer.
  • Use KLIC codes in UNI-Collect on the tablet.
  • Also visible in UNI-Machine in the cabin.

Available from UNI-Cloud Professional.

UNI-CLOUD

Where all your field work comes together

Every point, line and project syncs to UNI-Cloud. Plan the work, share with the office and clients, and keep the field and the desk on the same page.

Everyone who works in the project gets their own login.
UNI-Cloud is included in the UNI-Collect Survey Package for the first year.

Draw straight in the cloud and send a finished PDF report to your client.

UNI-Cloud project open on a desktop screen in the office

Import and export

Bring in a full AutoCAD drawing and export to DWG, DXF, LandXML, CSV, TXT or GeoJSON.

Projects

Set up layers and attributes once, use them in the field.

Real-time sync

Field data in the office the moment you save.

Share your results

Send a project to your client with a link or a QR code.

Working with layers in a UNI-Cloud project

Layers and attributes
Set them up once in the office. In the field your crew picks them from a list, so every point lands in the right layer.

Adding a file to a UNI-Cloud project by dragging and dropping it

Drag and drop your files
Drop a drawing or a point file straight into the project. It is on the tablet at the next sync.

Importing a CSV file with coordinates into UNI-Cloud

Import and export
Bring in a CSV of coordinates and set out from it. Export your results to AutoCAD, CSV or LandXML.

Building an integration? UNI-Cloud has an API for partners.

What our customers say

“Measuring tapes are a thing of the past. With the UNI-GR2 we are now able to equip every worker, foreman or technician in the field with an easy to use receiver to survey.”

Heijmans

The Netherlands

“By using the UNI-GR2 and combining it with our GIS tools, we have been able to work more efficient. On fibre optics projects, we are now able to skip about 50 process steps!”

BAM Infra Telecom

The Netherlands

“The stake-out function saves us a lot of time, with quick loading of points and lines. It’s easy to use, which is a big plus. We use the UNI-GR2 for baseline measurements, construction work, and sewer projects, and we’re very satisfied with it.”

T. Van de Haterd

The Netherlands

marXact support team member on the phone in the Hilversum office
SUPPORT

Support that keeps you working

Our own support team in Hilversum answers the phone during office hours, on a local number in the Netherlands, Germany and the UK. Those three numbers are an extra, not a limit: we help customers worldwide, by phone, email and chat, in several languages. What customers tell us most is that we keep them moving. Someone picks up a kit from a colleague, has never used it before and calls to ask how to set it up: that is usually sorted on the phone in a few minutes. If talking it through is not enough, we can take over the receiver remotely and look at it with you. For the harder cases we stay on it until you can get on with your work.

  • Email and chat support on every plan.
  • Phone support and remote assistance from Professional.
  • A replacement receiver if yours fails, on Ultimate.
See it in the field

Ready to survey with the UNI-GR2?

Book a demo and we’ll show you how the receiver works on your own site, with your own tools.

Or call us: +31 (0)70 700 7917

NO SURVEYING SKILLS? NO PROBLEM

Discover how our efficient, easy-to-use tools simplify surveying. Request a demo to explore tailored solutions, get expert advice, and try it out—no commitment needed!

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