SINCE 1828
gyrocompass
noun
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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