When I was in the Navy, I participated in similar exercises. Operating in a GPS-denied environment is only one objective we trained on. Identifying that you wer

When I was in the Navy, I participated in similar exercises. Operating in a GPS-denied environment is only one objective we trained on. Identifying that you were being jammed was also key. GPS jamming looks just like the "Huh, we're not locking on any satellites yet, better restart it" that we've all experienced with our car or smartphone. Also, it's likely that there are classified counter-counter-GPS systems or tactics that are being tested or trained on during Red Flag and other similar exercises, but these won't make it into the press.