Wall Street Journal: GPS Signals Are Routinely Jammed, February 2012

“GPS signals are being routinely jammed by devices that can be bought online for little money. While most jamming is not serious, there is the potential for criminals to block, or even fake, GPS signals, a conference will be told Wednesday. The evidence of illegal jamming in the U.K. comes from roadside monitoring carried out by the SENTINEL project, which looks at whether satellite navigation systems including GPS can be trusted by their users.”

Continue reading the WSJ article, which features an interview with Dr. Humphreys.