If you have a late model GM vehicle with OnStar, they are capable of tracking you, and have modified the contract terms to allow them to sell the information they collect at will. Speed, location, seat belt latch, and so on.
I would not own a GM vehicle under any circumstances. If you gave me one I would sell it. But even so, if there are good reasons that you have for driving one, you should Google up how to completely disable OnStar on your vehicle unless you trust GM and the government to always do what’s best for you.