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   ocr: When using maps to travel from one place to another, it is essential to have an orientation point. This point is north, and all Ordnance Survey maps have north marked on them. Where grid lines are included, those that run from the bottom to the top of the map-sheet are from south to north. The compass needle always points north. So to align a map correctly, you need to orientate or 'set' the map so that the map's north and the grid lines line up with the compass needle. The Three Norths