Did a bit of goggling and found this in the FAQ on the Silva website
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My compass no longer points North. Is this normal?
Please be aware that a reverse polarity is caused by exposing your compass to articles with iron content (something as simple as being placed next to a pair of scissors or a knife for a length of time, microwaves, high tension wires, etc.). Your compass can be repaired at no charge. Please contact us in advance for a return authorization number and shipping address. From the U.S.A, call 1-800-572-8822 between 8 am-6 pm, eastern time. From Canada, call 1-800-263-6390
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Not a great help to me in NZ so I think I will try stroking mine with a magnet.
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Whats a Compass? I thought GPS obsoleted them.
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Ah! But a compass does not require batteries
