I was flying one day a couple of years ago and NOTAMS warned of GPS NAV-STAR AND GLONASS jamming by the UK Ministry of Defence along my route. I thought 'OH yer! they'll have fun trying to manage that! so I turned on the GPS and guess what?....Not a sausage, totally useless. So Much for Pseudo Random Noise codes being unjammable. But what got me is they did it without jamming civil freq. which worked fine!
Also that’s not to mention the fact that the American Defence Dept. can invoke SA at any time without telling anybody!
