Flights misled over position, navigation failure follows

GPS spoofing does happen particularly in theatres of war, but this isn't currently one. Here the GPS was not jammed but rather deliberately spoofed. Designs for such devices have appeared before and some have been used. It does need to be powerful though to overwhelm the navigation of a plane at altitude. Many planes still have some form of INS which covers breaks in radio cover but GPS usually takes precedence. The less accurate INS is usually updated by GPS so it has the last accurate position when coverage disappears. When GPS is spoofed, the bad position seems to cause navigation failure. Planes have other NAVAIDS such VOR/DME or even a standard compass but they give bearings and distance rather than a direct position. And yes it was a plot element in a Bond film: *Tomorrow Never Dies* but apparently has been used IRL by the Russians and Chinese. The US has also apparently conducted tests but those in the area were warned with NOTAMS.