TL; DR: > Sarah [not real name] also mentioned that the car had been transferred from another Audi dealership in Orange County, California, when she bought it.

TL; DR: > Sarah [not real name] also mentioned that the car had been transferred from another Audi dealership in Orange County, California, when she bought it. Could they be the culprits? We called the original dealership and asked if they were familiar with this hardware or if they install GPS devices in their customers' cars. The dealership told us that they used to work with a company called Sky Link to install anti-theft devices, but didn’t activate them unless the buyer paid for the service. Could this be an explanation for this rogue GPS device? [...] Turns out, it had. The GPS device was bought by the dealership, but it was never activated. At last, we had proof that this was a device installed by the dealership. It feels like there are several "layers" to this story, putting all of them in one probably just confuses a lot of readers. In other contexts the UART pin-outs and bit-banging would be interesting to me but I just wanted to find out whodunnit.