For only $200 you can have some serious fun spying on your friends. There are two main ways of using GPS tracking, real time and passive. Real time tracking is by far the most expensive and requires a monthly fee to keep it active and useful. For the purpose of saving money, we will only discuss the passive method of GPS tracking. A passive GPS tracker is one that you physically need to recover from the vehicle to get at the data. For example… if you place the tracker on your friends car… you will have to wait until they come back… then take the device off of the car and plug it into your computer… now you know where they have been. See video below.