MAP SOURCES
There are a wide variety of sources of maps which can be used for navigation in the United Kingdom.Online
Online resources like Google Maps and Multimap, while great for planning roadtrips, don’t really cut it when it comes to navigating in the hills. Although Multimap uses Ordnance Survey (OS) data, the lack of detailed topology (the way in which geographical elements are related to each other) on Google Maps makes the later a definite non-starter.In mountain navigation you not only need to be able to see information about your immediate area but also the wider area, sometimes many miles out. This is essential when trying to use geographical features such as surrounding peaks and distant lakes to locate yourself on the map.
This is where the online maps generally fall down. Due to the limited area you can print out on a single sheet, a route could end up spanning multiple sheets of A4, which in driving rain and a gale could get quite confusing.