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You should always carry a good compass (those produced for orienteering by Silva and Suunto are probably the best). In good visibility it should be sufficient to orientate the map using the compass, so that north on the map lines up with north on the ground. At present, magnetic north is near enough to grid north not to have to adjust for magnetic variation. Learn to take bearings from a map and follow them using the compass in clear conditions, before you find yourself having to navigate in mist.

The most difficult thing in navigation is knowing how far you have travelled, which can be important when navigating in mist on Scottish hills. In extreme conditions it may be necessary to pace-count to measure distance – practise this skill in good conditions, so that you are prepared.

Probably the most common navigational error is to head in the wrong direction when starting to descend so it is a good habit to always check your compass when leaving a mountain summit, even in clear conditions.

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