If you're heading for Britain's hills and mountains, there's simply no better companion than OS Maps – an app that puts all ...

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 ...

The typical maps used by walkers are the Ordnance Survey Explorer maps. These are to the scale of 1:25 000, so every measurement on the ground is exactly 25,000 times larger than on the map.