National 3 peaks challenge maps mini map uses ordnance survey 1 25 000 scale mapping to bring you a walking map that will be very familiar to you 3 individual pocket sized maps your national 3 peaks challenge mini maps fold down to a handy a6 size and fits in your pocket making it the most convenient easy to carry printed map out there waterproof paper mini map is printed on waterproof paper try it out each map covers and area of 7km x 6 25km perfect for day trips route guides