Great Britain's Ordnance Survey National GPS Network

To encourage compatibility of national and global precise positioning of GP S surveys in Great Britain, Ordnance Survey is providing access at no cost to the new National GPS Network, via a website first available in June 2000 . By requiring the use of this infrastructure to provide ETRS89 control sta tion coordinates at a stated level of precision, survey clients can be assu red that any commissioned survey will be precisely consistent with any othe r, even if the two are widely spaced in location and time. All such surveys will also be precisely consistent with the Ordnance Survey large-scale bas e mapping, using the precise National Grid Transformation and National Geoi d Model. This is now the Ordnance Survey recommended 'standard method' of c reating new National Grid coordinate datasets, eventually to replace comple tely the traditional national control networks of triangulation stations an d height bench marks.