more at the above linkStarting today, it appears the US military will be testing a device or devices that will potentially jam GPS signals for six hours each day. We say â€œappearsâ€ because officially the tests were announced by the FAA but are centered near the US Navyâ€™s largest installation in the Mojave Desert. And the Navy wonâ€™t tell us much about whatâ€™s going on.
The FAA issued an advisory warning pilots on Saturday that global positioning systems (GPS) could be unreliable during six different days this month, primarily in the Southwestern United States. On June 7, 9, 21, 23, 28, and 30th the GPS interference testing will be taking place between 9:30am and 3:30pm Pacific time. But if youâ€™re on the ground, you probably wonâ€™t notice interference.
The testing will be centered on China Lake, Californiaâ€"home to the Navyâ€™s 1.1 million acre Naval Air Weapons Center in the Mojave Desert. The potentially lost signals will stretch hundreds of miles in each direction and will affect various types of GPS, reaching the furthest at higher altitudes. But the jamming will only affect aircraft above 50 feet. As you can see from the FAA map below, the jamming will almost reach the California-Oregon border at 4o,000 feet above sea level and 505 nautical miles at its greatest range.