RTK GNSS RECEIVER API Cloud marXact UNI-Cloud UNI-GR1 GNSS RTK Receiver GPS Glonass Beidou Galileo L1 L2 L5 GIS BIM CLOUD TelecomRTK GNSS RECEIVER API Cloud marXact UNI-Cloud UNI-GR1 GNSS RTK Receiver GPS Glonass Beidou Galileo L1 L2 L5 GIS BIM CLOUD Telecom



The RTK GNSS Receiver with CM accuracy, UNI-GR1. The most universal, cost-efficient receiver on the market, making centimetre accurate positioning input in your own software environment possible!

And, combined with the UNI-Cloud it offers a complete solution, including a surveying app and RTK corrections!

When ordered before 13.00 local time (The Netherlands), the UNI-GR-1 is shipped by UPS the same day!

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GNSS-ReceiverUsing the UNIApp & ControllerRTK NetworkIntegrationsOrder NowSpecificationsGet a Demo

The RTK GNSS Receiver with CM accuracy

Centimeter Accurate
The UNI RTK GNSS Receiver provides a highly accurate heading and positioning output
GNSS for everyone
Regardless of your job, the UNI is the tool to get you a CM accurate GNSS fix, so easy a caveman could do it!
Ease of use
Easily configure an extensive amount of settings with a wizard and start surveying right away, with your device of choice

Universal Connectivity
Connect to any device of your choice through WiFi, Mobile Data, Radio, USB or Serial Cable
Built-in Level
Easily level your UNI with the built-in level, a LED ring driven by the 9 degrees of freedom inertial measurement unit
Use any App
With so many connection methods, you can choose the app or software and platform that works best for you

The UNI offers a solution for every job

  • Survey & Mapping
  • Infra, Construction & More
  • Machinery & Integrations

Point Collection
Start collecting your centimetre accurate points with the free UNI-Connect interface! Or, connect the UNI RTK GNSS Receiver to the app of your choice and start collecting points with centimetre accuracy to deliver on your projects. Being universal, the UNI supports many free or paid apps for mapping & surveying to make sure you got the complete set in hand to collect your data.

Depending on the scope of your project, you should be able to choose the right workflow. Apart from doing a stakeout in the free UNI-Connect software, working on any device, you can choose the app you want to use for your stakeouts. Simply connect the UNI over one of the many connection methods to your chosen app and get going, whether that is with an extensive paid software package or a simple free app; the UNI will support it!

An app for everything!
Living in a time where there is an app for everything, you should be able to connect your RTK GNSS Receiver to all of these apps and with the UNI you can! With Bluetooth, WiFi, Mobile Data, cabled connections, UNI-Cloud, NMEA, RINEX and other interfaces we make sure you can connect your app and device of choice to a CM accurate GNSS receiver; the UNI-GR1

Everyone can measure!
With the cost as well as the ease of use of the UNI, everyone within your company can do centimetre accurate measurements. Whether you need your foreman to survey a point, your planner to stakeout a new project or your maintenance worker to find the location of an outage on it’s own; the UNI is the tool that get’s it done. With UNI-Connect you can do the basics or you can connect it to the right app for your company and you are good to go!

Deliver on the spot!
Measure the work you have just done and immediately deliver the results to your client in the requested format. Or, with the many integration possibilities, work directly in your own or your clients database or systems. With the universal setup of the UNI and UNI-Cloud, you can design your own workflows according to your company or client standards and automate your measurements.

A solution for every market!
Survey, Mapping, Infra, Construction and many more; since the UNI is a universal solution, offering many connection methods and letting you choose the software you like to use, the UNI is not limited to any market and can be used as far as creativity goes. Whether you install it on a tractor, a boat, measure points in the desert, stakeout a fibreglass project in the outback or monitor the Eiffel tower; we are sure there is an app that sorts your needs which you can connect to the UNI for your location!

Connect your machinery!
Through one of the many connection methods, you can connect your machinery to the UNI where the UNI provides the centimetre accurate location input to your autopilot, auto-steer, drone controller, tractor, UAV or any other machinery you may think of that needs a location input to get going.

Work in the cloud!
Leave your UNI RTK GNSS Receiver in the field and monitor the results from the office, download logs without connecting to the UNI and always have your data and settings safely stored. The UNI-Cloud let’s you sync your UNI at any time it’s online so you never lose your settings or data. Multiple users or projects? Control settings, profiles and device access per user or per project, making sure efficiency is achieved and nothing goes wrong on the job.

Integrate in your own environment!
By subscribing to the UNI-Cloud you get access to the constantly developing UNI-Cloud API so you can set up your environment to work with your UNI RTK GNSS Receiver. Make sure your data is automatically stored to your own servers and work with the UNI’s accurate location from your own software. We are always developing and looking to help your software or devices get smarter, we would love to hear where we can help you improve your processes!

Control the UNI from any device with a browser!

UNI-Connect: all the basics you need
The UNI-Connect software gives you all the basic functions you need to get going and it costs you nothing. UNI-Connect comes with every UNI-GR1 and with free updates, you will be able to survey points, do stake-outs, capture logs, set-up your UNI and much more. And, with an active UNI-Cloud subscription you can even sync everything live from and to the office!

The Controller: any device with a browser
Do you have a smartphone? Then you have a controller! The UNI-Connect app runs in a browser so you can work on almost any device. Simply connect to the UNI’s hotspot, open your browser and access the UNI-Connect interface where you can start surveying & more. For the UNI it doesn’t matter if you use an Android, Windows, Apple, iPad, Smartphone, Tablet, Laptop or PC; you choose how you work and the UNI adapts!

Third party or your own apps
While UNI-Connect gives you all the basics you need, we understand you might want to do more! With customizable NMEA stings and many connection methods such as WiFi, Bluetooth, Serial, RS232 and USB, the UNI-GR1 can connect to the app of your choice. You can also simply integrate the UNI in to your own software! Check out the integrations that already work and don’t forget your corrections, scroll down!

Manage your UNI from the Cloud & get accurate!

UNI-Cloud: on top of management
Want to sip you coffee while you see the work coming in at the office? With user management, device control, profiles and logs you are in full control of the work in the field since the work done by your team is automatically synced to the UNI-Cloud. Enabling you to download their work seconds after it’s done, send them points for stake-outs or amend the UNI’s settings according to the demands of the project.

Get your CM accuracy & Free Data!
With a UNI-RTK Premium subscription you can give your UNI or any other device supporting NTRIP, the RTK corrections it needs to get it’s accurate fix. With a free data SIM card at a years subscription, 2000+ base stations in 30+ countries, we got your accuracy requirements covered. Already have an external subscription? No problem, just type the NTRIP settings in the UNI-Connect software and get going!

Free Trials & UNI-Cloud Packages
While you can get the UNI-Cloud, UNI-RTK Premium and UNI-Support as single subscriptions, we made some packages for you to make your life easier (and cheaper). And, in case you are not sure yet what you need; all of the subscriptions come with a 30-day free trial, even UNI-RTK Premium! So what are you waiting for? Measure your first point tomorrow!

The UNI-GR1 RTK GNSS Receiver works seamlessly with…

marXact & Greenpoint
Greenpoint is an online platform for managing the outdoor space. Companies, municipalities, and contractors can get data about objects in
Read more.
Did you know that with the UNI-Cloud API, you can completely integrate your UNI in to your own software? Now
Read more.
QGis & marXact
Create, edit, visualise, analyse and publish geospatial information with QGIS! QGIS is a user friendly Open Source Geographic Information System
Read more.
TcpGPS by Aplitop & marXact
Aplitop is a company that is specialized in the design and programming of technical applications for Civil Engineering and Surveying.
Read more.
ESRI ArcGIS Data Collector & marXact
Collector for ArcGIS by ESRI is a mobile data collection app. It makes it easy to capture accurate data and return
Read more.
mapit GIS & marXact
mapit GIS – Spatial Asset Collection, GNSS Surveys and Data Management for Android, now working seamlessly with the UNI-GR1 to get
Read more.
Infrakit & marXact
Infrakit is digitizing infra-construction and enabling you to always share and view up-to-date infra project progress data on all PC
Read more.
GeolinQ & UNI-Cloud
GeolinQ is a no-code, web-based, software solution to collect, link and publish spatial data in an efficient and flexible way.
Read more.
Use ANY Android App!
Did you know you can use the UNI-GR1 with any Android app? Now you do! Many apps dedicated to Mapping
Read more.
MicroSurvey & marXact
MicroSurvey FieldGenius is a mature, professional and full featured field survey software package that also happens to be easy to
Read more.
Speer IT Cocon & UNI-Cloud
Following our goal to make high accuracy positioning work with any system out there, we are proud of the collaboration
Read more.
TADARIS Arpengo & marXact
Arpengo is an application under Android that helps simplify the work of topographic surveying with the possibility of getting away
Read more.
Carlson SurvPC & marXact
Carlson Software develops software solutions that bring the land development professional from concept to completion – the full cycle of
Read more.
MyCumulus & marXact
Mycumulus is a cloud-based service that has been released by ADW software. MyCumulus is a combination of an app, a
Read more.

Specifications & Demo

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Additional information

- GNSS Receiver




Integrated antenna with multi-path rejection technology.


L1 / L2 / L5


L1 / L2


E1 / E5a / E5b


B1 / B2 / B3




9 Degrees of Freedom

Time To First Fix

<45s (cold)

Init. Reliability


Update Rate

up to 20 Hz

- Accuracy (RMS)


Horizontal: 1.5m / Vertical 3m


Horizontal: 40cm / Vertical 80cm


Horizontal: 10mm+1ppm / Vertical 15mm+1ppm


Horizontal: 3mm+1ppm / Vertical: 6mm+1ppm


0.2(1m baseline)



- Wireless Connectivity

Mobile Data






Long Range Radio

868/915 MHz



- Waterproof Cabled Connections

12-pin connector

DC Charging / RS232 / CAN / Host USB / PPS / Event

Micro USB 2.0

USB Charging, Data Transfer

- Data

External Storage

MicroSD (incl.)


RTCM 2.x / RTCM 3.x

Solution Output

NMEA-0183 / NMEA-2000 / UNI Binary

Log Output


- Mechanical


14 * 14 * 9cm




Power Button


5 Status LED + LED Ring


9 Degrees of Freedom Powered LED Ring, level on the go

- Performance

Internal battery


Battery life

10+ hours

USB charging current


DC charging current




Water & Dustproof


Operating Temperature

-20 to +55 degrees celsius


2 meter pole drop

- Operating Modes




RTK, Network

Included Accessories

Rugged Casing / DC Adapter (18V @ 1.33A) / DC- adapter to 12-pin cable / Micro USB to USB – A cable

Optional Accessories

Serial RS232 to 12-pin cable / CAN (NMEA-2000) to 12-pin cable / UHF Radio 433 MHz Kit / Survey Pole

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