Magnetic sensors serve not only for the measurement of the magnetic field, but also to measure position, speed, force, torque, electric current and other variables. Magnetic compass is still an important navigation tool in case that GPS signal is not accessible, such as underground or underwater. Advances were made thanks to new materials (e.g. nanocrystalline), new principles (e.g. GMR and SDT) and new design procedures and tools (e.g. FEM simulation packages).
