OS Explorer Active Maps from Ordnance Survey are produced at a scale of 1:25,000 making them the most detailed waterproof OS Maps, ideally suited to the outdoors. The Explorer Active 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 Active Maps in the Explorer Active Series which cover the whole of Great Britain. We also sell non-waterproof versions of the Explorer Active Maps, so if you're not worried about your map getting wet in this wonderful British weather of ours then head over to our OS Explorer Maps section. All of our maps are Latest Editions.