Memory Map 2500 sq km, 1:25000 selections with arial photography- Custom areas of Ordnance Survey Explorer 1:25,000 scale maps and full colour Aerial Photography. Use the supplied FREE trial copy to choose the area you need, then Memory-Map will create your own unique seamless map and aerial photos covering up to 2,500 sqkm. All in this Memory Map 2500 sq km, 1:25000 selections with arial photography