Some of the higher interest rate lenders do require the installation of a GPS so they can repo the car if payments are not made. But, that needs to be in the contract. In Georgia, you can agree to just about anything provided it does not violate public policy. That said, however, if the contract does not require the GPS then they cannot force you to comply with that demand.
I do not practice in Georgia so I do not know what the laws there state but I would start with reading the contract for the sale of the vehicle as well as the finance contract. I am not aware of any circumstances where a dealership has forced a buyer to have a tracking device installed. I recommend you speak with a Georgia attorney to discuss your options. Many attorneys provide a free short initial consultation.
Legal disclaimer: Mr. Tabaku may be reached at (240) 750-4663 or email@example.com. Mr. Tabaku is an attorney licensed in the state of Maryland. This answer is for general information only based upon the facts stated in the question and does not create an attorney client relationship between Mr. Tabaku or Tabaku Law Firm, LLC and any person. You should schedule a consultation with an attorney to discuss the specifics of your legal issues.