A display unit of a navigation system in accordance with the present invention is equipped with route search means (13) for searching an optimum route on the basis of position data, node data (21), crossing data (19) and road data (23) and reduced scale setting means (15), sets a reduced scale of a display map in accordance with the distance between the present position and the destination and selectively displays a road to be displayed in accordance with the reduced scale on a display (31). This invention includes also a display (48) for displaying a crossing graphics consisting of a starting crossing, a neighbouring road network and landmarks and touch keys (35) such as a decision key for drawing a travelling direction on the displayed crossing graphics, a rotation support key for rotating the crossing graphics and displaying it, and the like. The invention is further equipped with a data processing control unit (46) for reading the position coordinates of a crossing landmark to be displayed from a map data (53), rotating and enlarging the position coordinates, converting them to the coordinates of a drawing area set.in the display means and sending an output signal so that the crossing landmark pattern is drawn in this converted coordinates.