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Each grid forms part of a much larger 100,000m square identified by a unique two-letter code. These letters are printed within the section headed The National Grid Reference System found in the key to each sheet, and are quoted in this guide immediately before the six-figure grid reference.

To identify an exact position on the map from a given grid reference, take the first two digits from the six-figure number quoted. These refer to the ‘eastings’ line on the OS map. The third digit is estimated in tenths of the square moving eastwards from that line. Next, take the fourth and fifth digits referring to the ‘northings’ line, and then the final digit estimating the number of tenths of the square reading up the sheet. Using this grid reference you should be able to pinpoint the exact position referred to in the text.

Times and Distances

Distances quoted in the text have been measured on the individual OS maps and double-checked using a pedometer, so they should be reasonably accurate. Please note that heights quoted on OS maps are in metres, not feet, and grid lines are spaced at intervals of 1km.