At 18:20 22 February 2013, Matt Herron Jr. wrote:
Latest GPS jamming tests (
https://www.faasafety.gov/files/notices/2013/Feb=
/NAFC_13-04_GPS_Flight_Advisory.pdf ) are mostly scheduled at night, but
th=
e week of March 11-15th they are smack in the middle of prime soaring
time;=
1:00-2:30PM PST. They may disrupt GPS functionality over most of
Californ=
ia and Nevada and a good chunk of Colorado during that time.

I have personally seen big holes of 20 minutes or more in my flight logs
in=
the past due to these tests. Anything that uses GPS is potentially
affect=
ed, and increasingly many of these devices are safety oriented.

Potential issues include;

1) ruined flight logs for contests, OLC, badges, or record flights
2) loss of GPS navigation to safe landing sites or getting home
3) loss of PowerFlarm collision warnings (due to GPS, not loss of 915mhz)
4) Loss of ADS-B warnings (can someone confirm this?)
5) loss of PCAS warnings?

What happens to drones flown by local law enforcement or private sector
dur=
ing this time? Does SSA or AOAP lobby against this testing on our
behalf?

Anyone else concerned or annoyed by this???

From experience in the UK these tests are very localised and in many cases
are confirned to restricted areas where we cannot fly anyway. Bit of a non
problem really. There are NOTAM'd so everyone is aware.

Matt