The gyro theodolite is an instrument for measuring the true north angle by combining the gyroscope and the theodolite through a connecting mechanism. It utilizes the physical characteristics (fixed axis and precessibility) of the gyroscope itself, and uses the metal belt to suspend the gyro sensitive part of the center of gravity to sense the horizontal component of the angular velocity of the earth's rotation, and generates a northward thrust under the action of gravity. The gyro spindle is reciprocated around the meridian plane of the earth to determine the true north angle. The gyro theodolite is widely used in mine surveying, engineering surveying and military surveying. It is also an important supporting equipment for radar antenna orientation, drone flight orientation, artillery and long-range weapon launching.
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