How to get Ordnance Survey Benchmark Values

Ordnance Survey no longer display their benchmark values on their 1:1,250 mapping data, the values however are still available from the Ordnance Survey website. Following the steps below you will be able to obtain specific benchmark values.

  • Find a benchmark on Promap, while the values have been removed from the mapping data the markers remain, indicating benchmark locations. Each should appear as an arrow on the map.
  • At the bottom left of the map the co-ordinates and tile references are displayed for the viewed location. Hover the mouse cursor over the bench mark and note the NGR reference displayed there.  You will only need the first two letters and the numbers that follow it.
    For example; If the NGR TQ2979NW was displayed you would need only TQ2979
  • Open a new internet browser and go to the following page on the OS website.
  • Enter the NGR reference into the Coordinates box at the bottom of the page and you will be given a list of benchmark values for the area entered along with descriptions for each and their corresponding Easting and Northing.
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