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  1. #1
    Junior Member ivss_xx's Avatar
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    ? Car has a built-in GPS signal jammer?

    Has anyone ever heard of cars that deliberately interfere with GPS signals?

    So, my friend has a Toyota Wish (2003 or 2005 make). Whenever we go geocaching with it, my Garmin Oregon 300 is rendered quite useless while the car is running. What happens is, the GPS accuracy shown in the device stays the same, it still shows 5m/6m/7m, the usual but the GPS arrow just drifts away somewhere. In reality, the accuracy is now about +/-100 up until 300 meters. It just goes somewhere in a random direction.
    When I get out of the car, if I want to get the location right, I have to restart my unit. If I do not restart it, it sorts itself out eventually but that takes some time, maybe 5 minutes or so. I can go back to the car, sit in it and everything is fine but as soon as we start driving, the GPS arrow drifts away again.

    So, the car has a built-in navigation, my guess is that maybe manufacturers have installed some sort of jammer that would interfere with GPS signals of the receivers in the car, and only their device has the decoder that gets the signal right after the jamming. That way you would be bound to use GPS from them and fix it by them, them making money out of it. But that sounds like really douchebag thing to do to your clients...

    Anyone ever experienced something like this?

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  3. #2
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    Hi
    as i know some car models have metallic coatings on the windshield and it interferes with GPS reception or some have a heated front windshield with wires running through the entire windshield and this causes issues without an external antenna.
    Btw when a vehicle is moving, that will significantly increase the amount of time it takes for the GPS to figure out where it is. Sometimes it might never get a signal if the vehicle is constantly moving before fixing the satellites.
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  4. #3
    Junior Member ivss_xx's Avatar
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    Hmm, backseat windows are coated indeed but I think that the windscreen and front side windows are not.
    The problem is not with catching the satellites but the fact that it still shows good GPS signal strenght, still shows all the locked on satellites, still shows that accuracy is 6-8m but actually it shows me somewhere elseplace on the map, up to 300m away in a seemingly random direction.
    That's what's weird.

  5. #4
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    Just a thought these GPS are basically radio receivers, so they have frequencies being generated for the conversions to lower frequencies for doing the work the processor needs to show your data on a screen, so my thought here is that your unit is picking up a frequency that it doesn't like.
    So would suggest you test this by using a different model/brand from a friend in the car.
    If it doesn't happen then it's your unit that is sensitive to the interference in the car, even better to try the same model to see if it's model based.
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