Sentinel project discovered evidence of a surprisingly large underground of GPS jamming across the country after starting monitoring in January 2011 using a network of 20 road sensors. One of the sensors by a busy motorway recorded more than 60 jamming incidents over a six-month period around the 5GHz band reserved for GPS. The most likely culprits are van drivers attempting to defeat their company’s GPS-tracking systems as well as vehicle thieves. The next step is to develop the system further so that it can be used for enforcement.”]
Source: https://www.csoonline.com/article/2130929/gps-jamming-becoming-problem-in-uk–study-finds.html