GPS Out of service??

On May 25, 7:44*pm, "BT" wrote:
are they using different antenna?
did you notice a power problem in the glider?

Maybe you flew through and area of GPS Jamming.
Different Jamming techniques will do different things, from totally denying
reception of GPS signals.. to tweaking the reception to make you think you
are going one way.. when the GPS is actually taking you off track

wrote in message

...



On my last two flights at Marfa Texas May 24 and May 10 I have lost
GPS navagation fixes for a few minutes on both flights. *I have two
GPS receivers (cambridge GPS/Nav and a lx-7000) both units lost their
fix at the same time and came back together. *Both flights are up on
the OLC if you want details. *Anyone else have the same experience?
Is it anything I can fix?

Bill Snead
6W- Hide quoted text -

- Show quoted text -

The two units have seprate antennas. The atmospheric pressure trace
was not effected. The units kept working (displays were on just no
nav info). I think the power was OK.

Bill Snead

Did you check the GPS Nav Center from USCG? They put up advisories on
GPS testing. They look like this:
http://www.navcen.uscg.gov/gps/gpsno...terference.pdf

If any of the testing areas are close, you have an answer. If there
was a magnetic storm, it could explain it, too - see space weather (I
doubt it right now, the sun is very quiet).

They also have prediction of dop - dillution of precision, or
accuracy, at http://www.navcen.uscg.gov/gps/pdop.htm (lower is
better).

If you report your gps problem at http://www.navcen.uscg.gov/gps/default.htm,
they will generally get back to you and tell you why there was a
problem.

Dan


On my last two flights at Marfa Texas May 24 and May 10 I have lost
GPS navagation fixes for a few minutes on both flights. *I have two
GPS receivers (cambridge GPS/Nav and a lx-7000) both units lost their
fix at the same time and came back together. *Both flights are up on
the OLC if you want details. *Anyone else have the same experience?
Is it anything I can fix?

Bill Snead
6W- Hide quoted text -