In one embodiment, a method includes accessing an image file that includes a magnetic map with normalized magnetic-field values that each correspond to one of a plurality of locations in an area. The image file includes a first matrix with first elements, ...

In a particular embodiment, a method includes receiving a first set of location data and a second set of location data at a mobile device. The method includes locating a first reference point identifier that is included in the first set of location data an...