OS Explorer Maps from Ordnance Survey are produced at a scale of 1:25,000 making them the most detailed OS Map, designed specifically for the outdoors. The Explorer Map is ideal for walkers, horse riders, off road cyclists, people who work in the outdoors and is also a great companion for people who just want to explore. There are 403 OS Explorer Maps in the Explorer Series which cover the whole of Great Britain. We also sell waterproof versions of the Explorer Maps, so if you're worried about your map getting wet in this ever unpredictable British weather then head over to our OS Explorer Active Maps section. All of our maps are Latest Editions.