Gyrotheodolite
Surveying instrument / From Wikipedia, the free encyclopedia
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In surveying, a gyrotheodolite (also: surveying gyro) is an instrument composed of a gyrocompass mounted to a theodolite. It is used to determine the orientation of true north. It is the main instrument for orientation in mine surveying[1] and in tunnel engineering, where astronomical star sights are not visible and GPS does not work.