Basically, Carrier Strike Group 4 Is Jamming GPS Across U.S. Southeast Coast - the Aviationist
The article goes on to describe how a pilot in a plane severely affected plane can radio a phrase on emergency channels to have the jamming shut off. But why so close to the coast? Some aircraft react very badly in autopilot modes thaty suddenly lose GPS or worse get a distorted signal.
In an operational environment jamming GPS signals represents both a threat and an important capability. In addition to serving an important purpose in navigation on land, sea and in the air, GPS also provides targeting capability for precision weapons along with many other tactical and strategic purposes.
For this reason, the U.S. military frequently trains to deny or degrade GPS signals on a large-scale. In 2017, we went inside Nellis AFB to get a firsthand demonstration of how easy and how quickly the U.S. Air Force can jam GPS signals for training purposes.