Unless I am mistaken, a fair number of studies have determined that that is insufficient as a method/means to explain the capabilities that they routinely display. Like one theory is that they somehow functionally have a literal metalic compass in their brain, or potentially ... basically an ability to sense geomagnetic subtleties and anomalies, and use those as waypoints and guidelines, but... again I might be out of date here, but afaik, nobody has yet proposed a non problematic or well verified hypothesis.