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Navigation Skills for Walkers, Hikers and Ramblers
- The National Grid
| In order to reference
any point in mainland Britain (England, Scotland and Wales) the area has
been divided into a grid of 100km squares. Each square has then been given
a unique two letter code (see right). Each 100km x 100km square is then further subdivided into 1km x 1km lines which are overprinted on Ordnance Survey maps. By further subdividing this 1km x 1km grid it is possible to give coordinates to any 100m x 100m square anywhere in the country using a 6 figure reference number. Since this 6 figure reference number can be duplicated in each of the 100km x 100km squares, you must add the two letter grid identifier to make the grid reference truly unique. For more details see Giving a Grid Reference. |
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