2. Navigation: Ben Nevis and Snowdon are relatively straight-forward in terms of navigation. Paths are well established, and in good, clear conditions should not pose any real problems, assuming you have good basic navigational skills. Extra care should be taken on the summit plateau of Ben Nevis which may be covered in snow well into the summer (summit map and information here), and groups using the Pyg Track on Snowdon should ensure they don't stray onto Crib Goch. Scafell Pike, however, presents walkers with many more problems - especially in darkness and/or mist. It is highly recommended that you take a dry run on Scafell Pike before you attempt the challenge. If in doubt, employ a mountain guide.