Many compasses require calibration from time to time because of magnetic interference. How come my car’s compass GPS never require calibration ?

Many compasses require calibration from time to time because of magnetic interference. How come my car’s compass GPS never require calibration ?
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Submitted July 30, 2017 at 08:09AM by diamondx911
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Many compasses require calibration from time to time because of magnetic interference. How come my car’s compass GPS never require calibration ?

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