Attackers can spoof navigation signals without our knowledge. Here's how to fight back GPS lies

Just hours before U.S. president Barack Obama delivered his final State of the Union speech in January, two U.S. Navy patrol boats wandered into Iranian waters. The Iranian military intercepted the vessels and captured 10 U.S. sailors, making for an awkward moment as the president took the stage. The seamen were released the next day, but no military official seemed able to explain why the boats h...