Speaking with one of our micro navigation experts, Martin Rooney, on the 3+ walk yesterday he told me that he has had 5 walkers whose compasses had reversed polarity in the recent past. The main culprit for this is having the compass next to a mobile phone in the rucksack.
if your compass has reversed polarity Martin is willing to sort it for you so give him a call.
For more information on the problem check out the article in the link below
