According to the different internal sensors, the north seeker can be divided into MEMS north seeker, optical fiber north finder, etc., and the MEMS gyroscope is the internal sensor that exists in the MEMS north finder. Because MEMS sensors have the advantages of small size and light weight, the volume of MEMS north finder is also small.
The relationship between MEMS gyroscope and north seeker can be expressed by the formula:
MEMS gyroscope +MEMS accelerometer =MEMS IMU
MEMS IMU+ North finding algorithm =MEMS North seeker

From these two formulas, we can also directly see the difference between the IMU and the north seeker, that is, there is no algorithm inside the IMU, and the north seeker contains the north finder algorithm. In the field of inertial navigation, the one that does not have an algorithm is called a module, and the one that has an algorithm is called a system, and the north finder is one of the inertial navigation systems. The MEMS gyroscope on the poster is a professional north-seeking gyro, which constitutes the MEMS north seeker, which can play an important role in oil logging, drilling, mining and other fields due to its special-shaped design.
Therefore, the MEMS gyroscope is one of the internal sensors of the North finder (inertial navigation system), which can measure the angular velocity of the object. With the MEMS north seeker, it has become a more complete system, which can measure the true north azimuth and stable output data.

For more information please read:
MEMS gyroscope: https://www.ericcointernational.com/gyroscope/mems-gyroscope/er-mg2-100-north-seeking-mems-gyro.html
MEMS north finder: https://www.ericcointernational.com/north-finders/mems-triaxial-north-seeker-for-mining.html