OS Mapping

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Ordnance Survey maps used for walking are either:- 
Explorer Maps 1:25000, 4 cm to 1 km (2½ inches to 1 Mile) or Landranger maps 1:50000, 2 cm to 1 km (1¼ inches to 1 Mile). 

On these maps contour lines are at either 5m or 10m intervals. You need to check which is used on each map. Heights are given in m above chart datum at Newlyn where OS grid references originate.

Grid references consist of 2 Letters followed by 6 digits.

Take the two letters from the corners of the map.
Read the Easting's across the top of the map, interpolating the third digit with the aid of the scale on the compass. 
Read the Northing’s down the side of the map, interpolating the third digit with the aid of the scale on the compass. 

This Grid reference will only occur once in the United Kingdom.

This should give a position within 100m², depending on whether the last number was rounded up or down.

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 Last updated: 05/10/2015 16:56