Starting today, and continuing for the next month, the FAA has warned airplane pilots that GPS signals on on the West Coast, and especially over California and Nevada, may be impacted. The reason why is not exactly clear, but as Gizmodo notes, the US military will be testing a device or devices that will potentially jam GPS signals for six hours each day. Officially the tests were announced by the FAA but are centered near the US Navy’s largest installation in the Mojave Desert, China Lake, located "just down the road" from Area 51. The Navy has kept silent about...