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This website is an essential resource for the precise Global Positioning System (GPS) user in Great Britain and also contains useful information for ALL users of GPS, both recreational and professional. It is intended for GPS-equipped surveyors (land, hydrographic, and engineering surveyors), and for Geographic Information Systems (GIS) developers who work with Ordnance Survey (OS) mapping and also contains information pages. Using the free services provided here, GPS surveyors can obtain precise coordinates in the European standard GPS coordinate system ETRS89, and instantly convert these to British National Grid and heights above mean sea level (Newlyn datum) using Ordnance Survey national standard high-precision transformation models. Surveyors and GIS developers can convert 2D and 3D spatial datasets from GPS coordinates to Ordnance Survey coordinates and vice-versa, with high accuracy.

GPS surveyors know that by using two or more GPS receivers together, high relative positioning accuracy can be obtained. With the services offered by this website, you can also achieve high absolute positioning accuracy throughout Great Britain, and you may be able to make your survey methods more efficient at the same time.

This website makes it easy to convert spatial datasets held in GPS latitude and longitude format to National Grid eastings and northings with high accuracy, using the OS national standard precise transformation.

Using this website, it is not necessary to visit triangulation stations to obtain National Grid coordinates which are fully compatible with OS mapping at all mapping scales - this can be done by GPS alone from any location.

Using this website, GPS surveyors can install their own 'height bench marks' on the Newlyn datum using a single GPS receiver, achieving relative heighting accuracies comparable to geodetic levelling, without visiting any existing OS bench marks. (This requires extended observation periods, and 'scientific quality' GPS hardware and software).

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