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   ocr: The 1 kilometre orange square in the diagram can be identified as SK 7458. This is the reference to the south-west corner of that square. The grid reference is constructed as follows: 60 SK= the reference for the 100 kilometre square 59 in which the shaded area falls. 58 57 7458 == the number of the Eastings grid line, 56 followed by the Northings grid line 55 which intersect to give the south-west 54 corner of the square. 71727374757677 SK For all grid references, Eastings are given before Northings - if you have trouble remembering this try - along the hall then up the stairs '!