GPS anomoly

[jimmyw]

Anyone have any idea what caused the so called anomolies with GPS signals last weekend in western US.They may have prevailed elsewhere but that's where we experienced them.Basically lack of signal.

 

[flyjumpseat]

Military is doing GPS jamming tests. There is supposed to be a NOTAM out with information but no one seems to know where it is or able to provide a reference number.

Also supposed to be between 14 Z - 20 Z until 08 August

 

[BEfly]

Military is doing GPS jamming tests. There is supposed to be a NOTAM out with information but no one seems to know where it is or able to provide a reference number.

Also supposed to be between 14 Z - 20 Z until 08 August

Yep. Usually in Nevada. I've only experienced that once or twice and ATC was was good for providing vectors for a while. I've heard of it happening in southern NM too.

 

[jimmyw]

thanks

 

[cjdriver]

Happens in Florida around mil space now and then.

 

[flyjumpseat]

Found it.

ATCSCC ADVZY 027 DCC 08/07/2008 OPERATIONS PLAN
ZLC-GPS JAMMING TEST 061400-062000Z (NOTAM ZLC GPS!07/073)
-----------------------------------------------------------
-----------------------------------------------------------
-----------------------------------------------------------
-----------------------------------------------------------
07/073 - NAV GPS IS UNRELIABLE AND MAY BE UNAVAILABLE
WITHIN A 375 NM RADIUS OF 401745N/1133300W AT FL400, DECREASING
IN AREA WITH DECREASE IN ALTITUDE TO 342 NM RADIUS AT FL250,
AND 245 NM RADIUS AT 10000 FT MSL AND 250 NM RADIUS AT 4000 FT AGL.
1400-2000 DLY. 02 AUG 1400 2008 UNTIL 07 AUG 2000 2008. CREATED 29 JUL 2102
2008

07/064 - NAV GPS IS UNRELIABLE AND MAY BE UNAVAILABLE
WITHIN A 375 NM RADIUS OF 401745N/1133300W AT FL400, DECREASING
IN AREA WITH DECREASE IN ALTITUDE TO 342 NM RADIUS AT FL250,
AND 245 NM RADIUS AT 10000 FT MSL AND 250 NM RADIUS AT 4000 FT AGL.
1400-2000 DLY. 11 AUG 1400 2008 UNTIL 14 AUG 2000 2008. CREATED 29 JUL 2101
2008

07/072 - NAV GPS IS UNRELIABLE AND MAY BE UNAVAILABLE
WITHIN A 375 NM RADIUS OF 401745N/1133300W AT FL400, DECREASING
IN AREA WITH DECREASE IN ALTITUDE TO 342 NM RADIUS AT FL250,
AND 245 NM RADIUS AT 10000 FT MSL AND 250 NM RADIUS AT 4000 FT AGL.
1400-2000 DLY. 02 AUG 1400 2008 UNTIL 07 AUG 2000 2008. CREATED 29 JUL 2102
2008

07/065 - NAV GPS IS UNRELIABLE AND MAY BE UNAVAILABLE
WITHIN A 375 NM RADIUS OF 401745N/1133300W AT FL400, DECREASING
IN AREA WITH DECREASE IN ALTITUDE TO 342 NM RADIUS AT FL250,
AND 245 NM RADIUS AT 10000 FT MSL AND 250 NM RADIUS AT 4000 FT AGL.
1400-2000 DLY. 11 AUG 1400 2008 UNTIL 14 AUG 2000 2008. CREATED 29 JUL 2101
2008

07/069 (A1215/08) - NAV GPS IS UNRELIABLE AND MAY BE UNAVAILABLE
WITHIN A 375 NM RADIUS OF 401745N/1133300W AT FL400, DECREASING
IN AREA WITH DECREASE IN ALTITUDE TO 342 NM RADIUS AT FL250,
AND 245 NM RADIUS AT 10000 FT MSL AND 250 NM RADIUS AT 4000 FT AGL.
1400-2000 DLY. 02 AUG 1400 2008 UNTIL 07 AUG 2000 2008. CREATED 29 JUL 2101
2008

07/068 (A1214/08) - NAV GPS IS UNRELIABLE AND MAY BE UNAVAILABLE
WITHIN A 375 NM RADIUS OF 401745N/1133300W AT FL400, DECREASING
IN AREA WITH DECREASE IN ALTITUDE TO 342 NM RADIUS AT FL250,
AND 245 NM RADIUS AT 10000 FT MSL AND 250 NM RADIUS AT 4000 FT AGL.
1400-2000 DLY. 11 AUG 1400 2008 UNTIL 14 AUG 2000 2008. CREATED 29 JUL 2101
2008