Walkers risk making serious navigational errors because items they are carrying can stop compasses working properly, says a Scottish mountain safety adviser. Heather Morning, who works for the Mountaineering Council of Scotland, warns that the number of incidents where compasses have been affected by ‘reverse polarity’ caused by metal in devices such as mobile phones, keys, crampons and even underwired bras, has been rising and are also more likely to occur in bad weather. With most mountain rescue call-outs resulting from navigational mistakes, the MCofS is keen to make hillwalkers more aware of the possibility of reversed polarity and what…










