Originally Posted By: Desperado
The closer you get to certain US Government facilities, it seems the less accurate they sometimes become.


The FAA routinely publishes areas where the signal is purposely degraded.

FL = Flight Level. Always add two zeros to altitudes, so FL400 = 40,000' MSL (mean sea level)

KEDW EDWARDS AFB

L0954/09 - NAV GPS IS UNRELIABLE (152100Z-2300Z, 162300Z-2359Z, 170001Z-0100Z, AND 171400Z-1600Z) AND MAY BE UNAVAILABLE W/IN A 344NM RADIUS OF N3556'52" W17734'35" NEAR BEATTY (BTY) VOR 218.3 RADIAL AT 65NM AT FL400 DECREASING IN AREA WITH DECREASE IN ALTITUDE TO 308NM RADIUS AT FL250, 228NM RADIUS AT 10000FT MSL AND 188NM RADIUS AT 4000FT AGL. THIS TEST IMPACT AREA ALSO EXTENDS INTO THE MEXICAN FIR. 15 SEP 21:00 2009 UNTIL 17 SEP 16:00 2009. CREATED: 14 SEP 16:16 2009