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→Magnetic Tracking
Most [[Head-mounted display|Head-mounted displays]] (HMDs) and smartphones contain [[IMUs]] or [[magnetometer|magnetometers]] that detect the magnetic field of Earth.
Magnetic tracking can be AC or DC. Magnetic tracking is great because it doesn't need a Kalman filter. It is much higher quality than all other tracking methods, but there are constraints on its usage, like how it cannot be used in environments with a lot of metal due to interference.
===Optical Tracking===
