Patent 9021709 was granted and assigned to BlackBerry on May, 2015 by the United States Patent and Trademark Office.
A method of indicating an interference magnetic field at an electronic device includes: displaying a first arrow indicating a direction of magnetic north on a display of the electronic device, the direction of the first arrow corrected to remove interference caused by an interference magnetic field; and displaying a second arrow indicating a direction of a source of the interference magnetic field on a display of the electronic device.