They simply access a wireless or satellite signal so that users can quickly get online, map out directions to where they are going, or text and call their friends and family. (texasdrivesafe.com)
It was not clear if they involved deliberate attacks; navigation specialists say solar weather effects can also lead to satellite signal loss. (fortune.com)
This is not the case when legitimate satellite signals are received, because they are transmitted from different positions in earth orbit. (sciencedaily.com)