Magnetic sensors and electronic compass using the same

A magnetic field sensor and the electronic compass using the same are provided. The magnetic field sensor is configured to sense the magnetic field component of each axis on a first reference coordinate system, and the first reference coordinate system is associated with the magnetic field sensors. When the sensitivity of an axis A of the magnetic field sensor in the first reference coordinate system is different from the other axis, the magnetic field component Am on the axis A is corrected using the following equation: Am=Am(n - 1)*(Wa-1)/Wa+Am(n)*1/Wa...(A) Therefore, the Am(n) is referred to a current measured magnetic field component along with the axis A, the Am(n-1) is referred to the previous measured or calculated magnetic field component along with the axis A, and the Wa is a weight value.