PetManimal writes "The Radio Data System standard, used in Europe and North America to send warnings to users of consumer satellite navigation systems, isn't authenticated or encrypted, and could potentially be hacked or used to sow confusion, according to an engineer and "hardware hacker":
It's uncertain what the fix is for this for people who already use satellite navigation systems in their cars. The article notes that most devices aren't easy to upgrade."Through trial and error, they discovered that transmitting certain code numbers translates into certain warnings that are displayed on the satellite navigation system. Some were amusing. One code number alerts users that there's a bull fight in progress. Another one indicates delays due to a parade. But some weren't so funny. One tells users that there has been a terrorist incident. Another indicates a bomb alert and another an air crash.