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===Magnetic===
Magnetic tracking determines the strength of the magnetic field in different directions. Most [[HMD]]s contain [[magnetometer]]s.
Magnetic tracking is utilized in [[Razer Hydra]]. It is usually a very accurate tracking method, although it can be influenced by magnetic fields generated by other electronics and objects near the sensor or emitter.
Most [[HMD]]s and smartphones contain [[magnetometer]]s, [[IMU]]s that detect the magnetic field of Earth.
===Optic===
