That the authors have experienced errors of over 50m on the summits of hills on days when atmospheric pressure changes were equivalent to changes in height reading of only 10 to 20m prompted this study, in which the accuracy of the instrument was tested. With the arrival or departure of a weather front, displayed altitude can change 20 to 50 metres, and a storm can cause a change of more than 50 metres'. However, just how accurately do altimeters measure height? The makers of one of the popular models claims 'On a typical day, minor atmospheric pressure changes may cause the displayed altitude to vary from the actual altitude by 20 metres.
These claims have also helped to bring these instruments to the attention of hillgoers.
The inclusion of Knight's Peak in Munro's tables was justified on height measurements made with an altimeter and recently altimeter measurements have led to the suggestion that Leathad an Taobhain, a Corbett in Glen Feshie ( ref. The use of altimeters in height measurement Graham Jackson and Chris CrockerĪltimeters have been used by mountaineers for many years, but the recent development of electronic wristwatch type instruments has made the altimeter easier to use and more popular with walkers and climbers.
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