Topnet Live

GNSS Positioning Correction service

Designed to meet the unique needs of our customers by providing reliability and accuracy of position information.

Product Info

Global GNSS
Correction Service

TopNETlive is a real time GNSS correction service delivering high quality data to GNSS receivers used for surveying, construction, GIS, mapping, OEM, system integrators and agricultural applications on a worldwide scale. Fully interoperable with all makes of network capable rovers, subscriptions are made easily available through the TopNETlive website. Topcon Positioning Group operates and monitors all TopNETlive networks. Topcon's geodetic specialists and professional standards ensure the highest quality correction data is delivered to each GNSS receiver, globally.

For correction service information, please visit:



Application Fields



Eliminating on-site base stations, TopNETlive is increasingly employed in high-profile construction projects. Large scale highway construction projects, airport runways and machine control operations all benefit from the reliable accuracy and performance of  TopNETlive GNSS reference networks.




TopNETlive networks deliver consistent, high precision solutions to Precision agriculture machines used in key applications across the crop cycle such as soil preparation, seeding and crop care. Equipped tractors, sprayers, spreaders and harvesters benefit from fast initializations and reliable positioning day or night.




TopNETlive delivers high accuracy positioning to professional surveying and engineering applications such as Land Surveying, Engineering Surveying,  GIS and mapping. TopNETlive removes the need for individual base stations, dramatically increasing production and safety.


OEM – System Integrators

TopNETlive is a global positioning correction service for system integrators, product designers and OEMs. It is ideal for scalable precision GNSS positioning needs for applications such as automotive, Industrial IOT and autonomous robotics.



Technology Overview


In order to provide precise positioning accuracy, a GNSS receiver needs to compensate for inaccuracies caused by satellite constellations, receiver hardware and atmospheric conditions. These inaccuracies can be calculated by a network of fixed reference stations that constantly receive GNSS data.

This correction information is then broadcast to GNSS receivers as a correction service. TopNETlive is Topcon’s GNSS correction service and consists of the reference station network, the correction calculation software and the correction broadcast service.

Positioning Methods

Topcon manages, operates and monitors all TopNETlive reference networks.


Real-Time Kinematic (RTK) is a positioning method to enhance the precision of position data derived from satellite-based positioning systems. RTK works through a network of stations covering local countries. Single Base RTK provides fast and accurate correction from one specific or nearest reference station. Network RTK delivers the correction from a number of stations in a local network of reference stations.


Precise Point Positioning (PPP) is a positioning method to calculate precise positions up to few centimeter level using a single receiver in a global reference framework. PPP delivers great accuracy with slower start-up speed, but provides service anywhere on the planet, independent of local networks.


Providing the Best of RTK and PPP

TopNETlive SkyBridge

SkyBridge allows subscribers to combine RTK and PPP​ correction services.

TopNETlive RTK

Provides greater accuracy and quick start-up time.

TopNETlive StarPoint

Provides the service anywhere on the planet, independent of local networks.


  SkyBridge TopNETlive RTK StarPoint

Correction Type / Delivery

RTK with PPP backup


PPP with L-Band

Coverage Global Local Global

2-4 cm

2 cm

4-10 cm

Initialization Time

Seconds Seconds

10-30 mins


Surveying, Construction, Machine Control, Agriculture

Surveying, Construction, Machine Control, Agriculture, OEM, Industrial IOT and Autonomous Robotics

Machine Control, Agriculture, OEM, Surveying in remote areas, Automotive, Industrial IOT and Autonomous Robotics



The TopNETlive correction service is broadcast to customer receivers in two ways:

  • NTRIP – The internet, typically using a mobile phone SIM card data link.
  • L-Band – Direct communication from a satellite. Customers have both options and can use whichever is most convenient.

Data Services

As an additional service, the raw data (RINEX) from the networks is available to download. There is also an on-line correction processing service for specialist applications.

Constant Coverage

Both types of networks offer advantages and disadvantages. That is why Topcon designed and developed a service to provide its customer access to both systems simultaneously, even switching between automatically as reception changes. This means the customer always has the best of both systems and a truly global service.


Full-Constellation Service

The Topcon reference station network uses all four GNSS satellite systems: GPS, GLONASS, Galllieo and BeiDou. This ensures the best accuracy and reliability, often referred to as a full-constellation service.

Why TopNETlive?


Truly Global Solution

TopNETlive is a truly global solution, providing a correction service anywhere with the combination of global PPP and local NRTK networks


NRTK networks are operated by Topcon and its Partners to provide coverage in all major regions of the world

Seamless Subscriptions

Subscriptions work seamlessly between different NRTK networks, which means customers can have a borderless service which switch between networks automatically, using a single subscription

Reliable Service

TopNETlive is managed by Topcon’s own network and geodesy experts, which ensures a precise and reliable always on service

Flexible and Tailored

Topcon’s OEM GNSS boards can be pre-configured for immediate use by system integrators customers, with flexible subscription/licensing options to suit the exact needs

Fully Scalable

The entire solution is designed to be scalable, so the system integrators does not need to be concerned about limiting where or how many customers they have


Get support where & when you need it-
for all your Topcon products.

Online Support

A simple, free login entitles you to the following benefits:

  • Downloadable product manuals
  • Video tutorials and quick guides
  • Comprehensive training and documentation
  • Dealer assistance with any tech issues
Create a free Topcon account
Extend Your Benefits

Register your product now to receive additional support including: 

  • Software & firmware updates
  • Product-specific notifications
Register your Product

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