A GPS navigation system provides you with information related to your location and driving direction. It is used to navigate. On the other hand, a GPS tracker system is responsible for keeping track of the vehicle's physical position and monitoring it's speed and direction.
GPS satellites circle the Earth twice a day in a precise orbit. Each satellite transmits a unique signal and orbital parameters that allow GPS devices to decode and compute the precise location of the satellite. GPS receivers use this information and trilateration to calculate a user's exact location.
