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Changes to access and presentation of Ordnance Survey control information:

Bench marks and triangulation points

After a public consultation in the spring of 2005, we have decided to remove the cartographic text associated with bench marks from the OS MasterMap Topography Layer^®. The topographic point (with height attribute) and cartographic symbol will remain.

Customers will start to see the changes in OS MasterMap Topography Layer from the next refresh of data on 4 April 2008

Surveying techniques have moved towards the Global Positioning System (GPS), and we are no longer maintaining traditional horizontal (triangulation stations) and vertical (bench marks) control points. As a result, the height information associated with these control points has become out of date.

We offer traditional control information to surveyors who do not use methods such as GPS. A frozen dataset of information is available at www.gps.gov.uk, as well as an expanding set of GPS based products and services.

For further information regarding this notice, please contact our Customer Service Centre (see 'contact us' below).

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