A talk from the hacker conference 39C3 about the Baltic Jammer (which causes GPS interferences in the baltic sea) and how a civilian project plans to protect against it with existing infrastructure. (in English)
I live in a suburb to the north of Stockholm, I have experienced the GPS jamming first hand.
There were a few days when my car’s inbuilt GPS thought I was driving around in another suburb on the other side of the city.
Does anyone know if GPS has the abillity to do signed packets?
I mean, I’d rather the GPS fail completely, than giving me false data.
Civilian-use GPS signals are unencrypted specifically because they want to be as open as possible. It was originally a military only system, that was only opened up in 2000 after a civilian airliner blundered into Russian airspace and got shot down.
Military-only signals are encrypted. There are also newer civilian-only signals with checksums and on alternative frequencies but there aren’t enough of the new sats up yet to live on it fully. Check whether your phone supports dual-band GPS, or specifically the L5 signal. There are even apps you can download that will display the full output of your GPS chip, including every satellite in view.
At least, it did not tell you, you were in Kaliningrad… 😉