Use of TAPAS

Cost of using TAPAS

It is free to use TAPAS. The Agency for Data Supply and Efficiency covers the maintenance costs for the TAPAS platform.


TAPAS corrections will initially be accessible to users on a continuous basis and there will be an option to adjust the composition of the GNSS data that forms the basis of the correction. This could be done, for example, by only receiving data from Galileo satellites. Should it prove necessary, specific uptimes for the different GNSS or reference stations can be agreed with the user in question.

Users will be informed of scheduled changes and maintenance times on this website.

Technological additions to the TAPAS platform

TAPAS has a flexible design which allows it to meet user needs for research and development related purposes. If you would like an addition to the platform, the matter of self-financing will have to be settled when entering into a user agreement.

Requests for technical additions should be sent to the Agency for Data Supply and Efficiency at:

Access to TAPAS

In order to gain access to TAPAS correction data, you will have to register as a user and sign a user agreement.

This can be done by contacting The Agency for Data Supply and Efficiency via this email: You will be given access to a user agreement, which should be signed and will have a duration that is specific to your project.

After signing up, you will receive a username and password. You will also be provided with information about access to a connection stream for TAPAS correction data.

Equipment for using TAPAS

To use TAPAS data, you will need a GNSS receiver that can receive correction data, and it must also meet the following requirements:

  • Multi-frequency geodetic GNSS receiver.
  • The rover (the GNSS receiver) needs to be connected to the internet (usually a GSM modem).
  • The receiver needs software which enables utilisation of RTK correction data (VRS, MAC, FKP, etc.) or State Space Representation (SSR).
Choice of distribution method

TAPAS correction data can be accessed in two ways:

  • Internet.
  • GSM (mobile network).

To receive TAPAS corrections through the internet, the GSM modem must be correctly configured, and the router has to be configured to manage TAPAS correction data through a Network Transport of RTCM via Internet Protocol (NTRIP).

Connecting to TAPAS data

TAPAS correction data is accessed via the internet through a Network Transport of RTCM via Internet Protocol (NTRIP).

More information about access and use of NTRIP can be found here:

Date/coordinate system

Generally, TAPAS delivers data in the ETRS89 reference system, which means the coordinates are transferred as ETRS89 coordinates with ellipsoidal height. Conversion from ellipsoidal height above sea level (DVR90) is carried out using a geoid, which would usually be integrated in a GNSS receiver.

Support on using TAPAS

If you send your enquiry on a weekday between the hours of 9am and 4pm, users can expect to receive confirmation within a few days. Please direct any questions to:
20 JANUARY 2020