I discovered today that my Silva 4 compass has an almost 180 degree error. Fortunately I was with a group so it was not an immediate problem.
It's about 3 years old. Are they repairable?
Any suggestions on why this has happened? Could proximity to a camera or GPS in my rucksack be the cause? We also live near to overhead power lines - could electro-magnetic radiation be a cause - over a period of time?
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