A navigation system is provided. A medium insertion port is disposed on the front surface of a main unit and a portable recording medium is loaded into or unloaded from the main unit through the medium insertion port. A display unit is disposed on the front surface of the main unit and can move between a closed position where the medium insertion port is covered and an opened position where the medium insertion port is exposed. A limitation section limits the movement of the display unit to the opened position. A limitation removing section removes the limitation by the limitation section. An operation section receives an operation on the navigation system. The operation section can receive an operation other than an operation to be intrinsically received by the operation section. The limitation removing section removes the limitation by the limitation section when the operation section receives the operation other than the operation to be intrinsically received.