Is Uncle Sam playing with the system?
It could be Uncle Sam, then again it might not be. Spoofing the unencrypted 1.57542 GHz L1 PRN signals to generate a little local Selective Availability might be of course being performed by someone else. Jamming GPS is even easier. Just a scaled up version of one of these.
http://www.dealextreme.com/details.dx/sku.8758http://news.bbc.co.uk/1/hi/england/cornwall/6719639.stm
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