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Overview of OS Net

Our OS Net network delivers accurate national coordinates for Great Britain.

OS Net is our highly accurate and resilient network of Global Navigation Satellite System (GNSS) base stations across Great Britain.

OS surveyors use the OS Net network to accurately survey map features using the latest GNSS technology. OS Net-based positioning services are available to other surveyors via our commercial partners. 

Recorded OS Net data, in the open standard RINEX format, is freely available and we host a range of coordinate transformation resources for both developers and other users.

Discover more about OS Net

Further information is also available in our guide to mapping coordinate systems (PDF).