The GPS-map speed matching system for controlling the speed of the vehicle is described. The system includes a GPS navigation receiver, a database processing facility, a GPS computer, an engine computer, a video display, a speed sensor and a heading sensor. The database processing facility can be local or remote. The GPS computer obtains the latitude, longitude, heading and speed of the vehicle. The database processing facility processes the GPS data and obtains the location and the maximum posted speed of the vehicle. The GPS computer or an engine computer perform the comparison between the vehicle speed and the maximum posted speed and signal the odometer to decrease the vehicle speed if the vehicle speed exceeds the maximum posted speed plus some predetermined value.