How to track rotations in the horizontal plane with the MPU-6050 sensor for Arduino?

Question

Arduino

Hello. There is an Arduino Mega 2560 and a sensor for it MPU-6050. It is necessary to track the turns in the horizontal plane. As far as I understand, for this you need to use the magnetometer built into the sensor (as far as I understand, this is the same as the electronic compass), but, unfortunately, I could not find documentation for this. That is, I learned how to work with a gyroscope and an accelerometer, but not with a magnetometer. Please help and thanks in advance.