First hand experience with GPS Jamming

Originally Posted by Steve Leonard[_2_]

Got my first experience with GPS Jamming. Apparently, lots of
truckers on I-35 near the Kansas-Oklahoma border were jamming today.
I would go from 8 satellites showing on my GPS Nav Display (Cambridge
Model 20 GPS) to none, lost distance to turnpoint, lost ground track,
lost bearing to turnpoint in the blink of an eye. Typically, after a
minute or two, the GPS Nav would resume navigation with three
satellites showing. It would in rather short order (10-15 seconds)
get back up to tracking 8 satellites. Repeat process in 2-5 minutes.

I am assuming this was GPS jamming, as nobody else flying from
Sunflower reported any sort of issues, and it only happened in this
one stretch along I-35. Interestingly enough, it happend only once (I
think ) after I crossed to the east side or I-35. Maybe I was just
far enough from the jammers.

My flight is uploaded to OLC. If you download it and watch it in any
playback, you will see me stop, then jump forward. This particular
GPS has worked perfectly before and since. It was only this one brief
section of one leg of the flight. Of course, it really gets your
attention when your display goes all dashes, and the computer says
"GPS Wait".

Anyone else had an "encounter" like this?

Just curious

Steve Leonard
Nimbus 3 VJS

The GPS jamming device is really a kind of gadget that block the signal of a GPS unit. I hit upon a website that sells lots of jammers like the cell phone jammer and GPS jammer, it is http://www.jammerall.com/ , you can go there and take a look , it's really funny.

On Jul 24, 11:52*pm, Alfaest wrote:
'Steve Leonard[_2_ Wrote:









;777762']Got my first experience with GPS Jamming. *Apparently, lots of
truckers on I-35 near the Kansas-Oklahoma border were jamming today.
I would go from 8 satellites showing on my GPS Nav Display (Cambridge
Model 20 GPS) to none, lost distance to turnpoint, lost ground track,
lost bearing to turnpoint in the blink of an eye. *Typically, after a
minute or two, the GPS Nav would resume navigation with three
satellites showing. *It would in rather short order (10-15 seconds)
get back up to tracking 8 satellites. *Repeat process in 2-5 minutes.

I am assuming this was GPS jamming, as nobody else flying from
Sunflower reported any sort of issues, and it only happened in this
one stretch along I-35. *Interestingly enough, it happend only once (I
think ) after I crossed to the east side or I-35. *Maybe I was just
far enough from the jammers.

My flight is uploaded to OLC. *If you download it and watch it in any
playback, you will see me stop, then jump forward. *This particular
GPS has worked perfectly before and since. *It was only this one brief
section of one leg of the flight. *Of course, it really gets your
attention when your display goes all dashes, and the computer says
"GPS Wait".

Anyone else had an "encounter" like this?

Just curious

Steve Leonard
Nimbus 3 VJS

The GPS jamming device is really a kind of gadget that block the signal
of a GPS unit. I hit upon a website that sells lots of jammers like the
cell phone jammer and GPS jammer, it ishttp://www.jammerall.com/, you
can go there and take a look , it's really funny.

--
Alfaest

This product can send mess codes to create interference to block
signals from the GSP satellites and the typical jamming range is 10 to
20 meters.

10-20 meters? how would that jam my GPS in a glider at altitude?

On Jul 25, 8:30*am, glidergeek wrote:
On Jul 24, 11:52*pm, Alfaest wrote:





'Steve Leonard[_2_ Wrote:

;777762']Got my first experience with GPS Jamming. *Apparently, lots of
truckers on I-35 near the Kansas-Oklahoma border were jamming today.
I would go from 8 satellites showing on my GPS Nav Display (Cambridge
Model 20 GPS) to none, lost distance to turnpoint, lost ground track,
lost bearing to turnpoint in the blink of an eye. *Typically, after a
minute or two, the GPS Nav would resume navigation with three
satellites showing. *It would in rather short order (10-15 seconds)
get back up to tracking 8 satellites. *Repeat process in 2-5 minutes.

I am assuming this was GPS jamming, as nobody else flying from
Sunflower reported any sort of issues, and it only happened in this
one stretch along I-35. *Interestingly enough, it happend only once (I
think ) after I crossed to the east side or I-35. *Maybe I was just
far enough from the jammers.

My flight is uploaded to OLC. *If you download it and watch it in any
playback, you will see me stop, then jump forward. *This particular
GPS has worked perfectly before and since. *It was only this one brief
section of one leg of the flight. *Of course, it really gets your
attention when your display goes all dashes, and the computer says
"GPS Wait".

Anyone else had an "encounter" like this?

Just curious

Steve Leonard
Nimbus 3 VJS

The GPS jamming device is really a kind of gadget that block the signal
of a GPS unit. I hit upon a website that sells lots of jammers like the
cell phone jammer and GPS jammer, it ishttp://www.jammerall.com/, you
can go there and take a look , it's really funny.

--
Alfaest

This product can send mess codes to create interference to block
signals from the GSP satellites and the typical jamming range is 10 to
20 meters.

10-20 meters? how would that jam *my GPS in a glider at altitude?- Hide quoted text -

- Show quoted text -

The GPS signal from the satellites is a very low amplitude psuedo-
random-noise signal. It doesn't take much to make it unusable. A choke
ring antenna would probably eliminate the problem if you always flew
wings level, but that's not going to happen, is it?

Originally Posted by glidergeek

On Jul 24, 11:52*pm, Alfaest wrote:
'Steve Leonard[_2_ Wrote:









;777762']Got my first experience with GPS Jamming. *Apparently, lots of
truckers on I-35 near the Kansas-Oklahoma border were jamming today.
I would go from 8 satellites showing on my GPS Nav Display (Cambridge
Model 20 GPS) to none, lost distance to turnpoint, lost ground track,
lost bearing to turnpoint in the blink of an eye. *Typically, after a
minute or two, the GPS Nav would resume navigation with three
satellites showing. *It would in rather short order (10-15 seconds)
get back up to tracking 8 satellites. *Repeat process in 2-5 minutes.

I am assuming this was GPS jamming, as nobody else flying from
Sunflower reported any sort of issues, and it only happened in this
one stretch along I-35. *Interestingly enough, it happend only once (I
think ) after I crossed to the east side or I-35. *Maybe I was just
far enough from the jammers.

My flight is uploaded to OLC. *If you download it and watch it in any
playback, you will see me stop, then jump forward. *This particular
GPS has worked perfectly before and since. *It was only this one brief
section of one leg of the flight. *Of course, it really gets your
attention when your display goes all dashes, and the computer says
"GPS Wait".

Anyone else had an "encounter" like this?

Just curious

Steve Leonard
Nimbus 3 VJS

The GPS jamming device is really a kind of gadget that block the signal
of a GPS unit. I hit upon a website that sells lots of jammers like the
cell phone jammer and GPS jammer, it ishttp://www.jammerall.com/, you
can go there and take a look , it's really funny.

--
Alfaest

This product can send mess codes to create interference to block
signals from the GSP satellites and the typical jamming range is 10 to
20 meters.

10-20 meters? how would that jam my GPS in a glider at altitude?

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