indigojoker
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when a compass is installed on an iron ship, why must there be small correcting magnets installed near the compass? Is it because the iron is itself magnetized somehow?
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Bill Foster
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Not necessarily. But iron is a magnetic material and will affect the compass needle. Just as you can use magnets to pick up nails. The nails aren't necessarily magnetized, yet they are still attracted to a magnet.
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It could be due to the fact that true north is different from the magnetic north.
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