Maybe if one were to have EXTREMELY accurate baseline magnetic field data for the whole world subs could still be detected? http://www.gfz-potsdam.de/en/media-

Maybe if one were to have EXTREMELY accurate baseline magnetic field data for the whole world subs could still be detected? http://www.gfz-potsdam.de/en/media-communication/press-releases/details/article/satellitentrio-zur-erforschung-des-erdmagnetfeldes/ http://www.gfz-potsdam.de/en/media-communication/press-relea...