Correlating Overlapping Magnetic Measurement Data from Multiple Magnetic Navigation Devices and Updating a Geomagnetic Map with that Data

In one embodiment, a method includes receiving from multiple magnetic navigation devices magnetic measurements of one or more geographical regions collected over a period of time; performing a similarity correlation analysis on the magnetic measurements; generating one or more geomagnetic map patches corresponding to the one or more geographical regions based on the similarity correlation analysis; transmitting the one or more geomagnetic map patches to a main mapping server for updating geomagnetic map data; receiving updated geomagnetic map data from the main mapping server; and transmitting the updated geomagnetic map data to one or more of the magnetic navigation devices for navigation and localization.