Fred, I can relate to the experience about having a device like that on your vehicle. I don't on my personal vehicles, but I drive a tractor trailer for a living & it's equipped with an on board computer that keeps track of my logs. (Logs are required by law.) It's also got a GPS system built in & records all kinds on operational information. I was once accused of a hit & run in the truck, but like you there was no damage to my truck & the GPS showed that I was in a different state at the time of the alleged accident. Needless to say the company told the other party to pack sand!