Hello, this is not related to Apple Car. I am considering to buy a car and install a GPS. It seems that there are two options: 1) Use google map or other app from cell phone as a GPS. 2) get a GPS specifically for car I guess in case one, it is better to get unlimited data. Am I right? In case 2, do I have to subscribe to some kind of monthly mobile plane like the cell phone in order to use the GPS?