If you're heading for Britain's hills and mountains, there's simply no better companion than OS Maps – an app that puts all 607 Ordnance Survey maps ... use of every OS Explorer (1:25k) and ...

Ordnance Survey maps, the most common type of map ... These are useful for drivers going shorter distances. Explorer maps are 1:25,000 (1 cm = 250 m). These are useful for walking and other ...