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Altimeter

When skiing it is unusual to be able follow a direct compass bearing. Occasionally, on a well-covered glacier such as the Grosser Aletsch, it is possible, but normally crevasses have to be avoided and turns are essential. An altimeter when skiing is an indispensable piece of equipment for accurate navigation in poor visibility. Wristwatch-style altimeters that can be worn outside a jacket are particularly useful. They can be referred to whilst on the move without loss of time or rhythm. Trying to gauge your speed of descent when skiing in poor visibility is all but impossible. An altimeter will save the day and give your altitude, if not your exact position, on a particular slope. In addition, they act as a barometer, indicating pressure variation and therefore potential changes in the weather.

GPS

Global Positioning Systems are increasingly being used by skiers. They are not a substitute for good navigation, which is as much about good judgement and route choice as simply about knowing where you are. However, when combined with sound navigational skill they are very useful, and very reassuring in white-out conditions.