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gy·ro·com·pass | \ ˈjī-rō-ˌkəm-pəs also -ˌkäm- 
\
\Definition of gyrocompass
: a compass consisting of a continuously driven gyroscope whose spinning axis is confined to a horizontal plane so that the earth's rotation causes it to assume a position parallel to the earth's axis and thus point to the true north
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Time Traveler for gyrocompass
The first known use of gyrocompass was in 1910
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