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===Rotational Tracking===
A key feature of an HMD is the ability to track the wearer's head rotations. The images shown on the display change based on according to the wearer's head movements. Head-tracking is an essential aspect of the HMD that allows the user to become immersed and feel [[presence]].
Rotational Tracking is achieved through sensors such as the [[Gyroscope]], [[Accelerometer]] and [[Magnetometer]] within the HMD.