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Gyrotheodolite

A Wild GAK gyroscope mounted on a Wild T-16 theodolite.

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.

  1. ^ Cite error: The named reference Hong-lan was invoked but never defined (see the help page).

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