A navigation system includes a housing incorporating an electrical connector, a display, a memory reading device, and a computing means connected to the display. The computing means calculates a route from a selectable starting location to a selectable end location. A user is lead along the calculated route to the selected end location by displaying route information on the display. The housing is removably attached to a base member. The base member is mounted to a dashboard of a vehicle. A power supply cable is led out of the base member and has a plug at its end which projects outwardly for connecting to a respective power supply socket of the vehicle. A satellite position detection receiver is connected to the base member for determining actual location. An electrical connector leads at least a signal of the satellite position detection receiver and the supply power into the housing.