Can the team use GPS trackers on cars?

Many taxi companies install GPS trackers in cars to track the location of cars and drivers. Teams use GPS tracking device in the car, on the one hand, accurate information can be car company, can prompt understanding to the position of the car and driver, can provide a more convenient way for passengers, it also can ensure the safety of the car and passengers. However, there will be some infringement on the driver's whereabouts, the driver can't have better privacy, and the feeling moment is in the state of being monitored and tracked. So many drivers in order to make their own privacy protection to a certain extent, they bought a car on the Internet to avoid GPS tracker, car GPS jammer when necessary to open, so did not defeat the purpose of automobile company, just for the sake of when necessary to protect their privacy.