Why were the Active Network station coordinates updated in February 2002?
A. The accepted GPS coordinate system through out Europe is the European Terrestrial Reference System 1989 (ETRS89), which is fixed in time at the epoch 1989.0. Europe also has an accepted coordinate reference frame, within ETRS89, known as EUREF. EUREF is controlled and monitored by the International Association of Geodesy (IAG) sub-commission for Europe (who also call themselves EUREF). The Active station coordinates have always been computed to the highest possible standard and expressed in EtrS89 at epoch 1989.0. This makes them compatible with coordinates in the rest of Europe. However the official IAG extension to the EUREF frame in GB remained the 26 passive stations of the EUREF GB 92 network (also known as SciNet 92). This network was observed in 1992 but now, with the modern equipment and techniques of the Active network, a much better EUREF extension can be computed. Once the Active network was fully established it was decided to make a sub network of Active stations the new
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