Write a sketch for a magnetometer

The services of a design engineer with design skills for Arduino are required. It requires writing a sketch for the GY-85 magnetometer. I want to build a device that tracks the position of the head. And to track the turns of the head, I need a magnetometer, but I managed to make it work only in a horizontal position, and when it is tilted, the values change greatly. Therefore, you need to combine a magnetometer with a gyroscope. The performer is only required to write a sketch that displays readings from a magnetometer in the port monitor. The indications must be calibrated and not depend on the inclination of the magnetometer. All this needs to be done for the arduino and gy-85 board.