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Gyroscope
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===Heading indicator=== {{Main|Heading indicator}} The heading indicator or directional gyro has an axis of rotation that is set horizontally, pointing north. Unlike a magnetic compass, it does not seek north. When being used in an airplane, for example, it will slowly drift away from north and will need to be reoriented periodically, using a magnetic compass as a reference.{{sfn|Feynman|Gottlieb|Leighton|2013|pp=115β135}}
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