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directional gyro

noun
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Definition of directional gyro

: an air-driven free gyroscope with rotor spinning on a horizontal axis that when manually set to some one direction maintains that fixed direction despite maneuvers of its conveyor and thereby indicates any deviation from the course

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“Directional gyro.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/directional%20gyro. Accessed 17 Jun. 2021.

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