Gyroscopes are used in compasses and automatic pilots on ships and aircraft, in the steering mechanisms of torpedoes, and in the inertial guidance systems installed in space launch vehicles, ballistic missiles, and orbiting satellites.

Why gyroscope is used in mobile phones?

A gyroscope in your phone enables it to sense linear orientation of the phone to auto rotate your screen. While the gyroscope takes care of the rotational orientation, it is the accelerometer that senses the linear changes relative to the frame of reference of the device.

Why gyroscope is used in PUBG?

Gyroscope in PUBG helps the mobile players with lateral and up-down movement without using the thumb or fingers to move the player on the screen manually. So, the game uses the gyroscope sensor, which optimizes screen orientation with the mobile's physical movement.