I would like to know what other functionality is provided by the magnetometer inside android devices besides allowing applications to display a compass. Can an app do anything else with it besides display compass functionality?
Magnetometer reports the magnetic strengths on the three axes of the phone. Can work as compass , metal detector and can also be used to increase mapping accuracy.
The magnetometer measures magnetic field, so it can do anything a magnetometer can do. Other than compass, the magnetometer can be used as a metal detector for instance.