Abstract: According to the 1st aspect of the invention, a navigation system comprises: a storage unit that stores map data managed with links representing smallest road units; a road map display unit that displays a road map based upon the map data; a depressed position detection unit that detects a depressed position on the road map on display; and a route setting-unit that extracts a corresponding link corresponding to the depressed position and sets the extracted corresponding link as a route to a destination based upon the map data, and the route setting unit extracts a link adjacent to the corresponding link and makes a decision as to whether or not the adjacent link can be entered from the corresponding link based upon the map data.

Abstract: A navigation system includes: a roadmap display unit that displays a roadmap at a display monitor; a current position detection unit that detects a current position of the navigation system; a setting unit that sets a right turn instruction or a left turn instruction for an intersection displayed in the roadmap; and a guidance unit that provides guidance based upon the right turn instruction or the left turn instruction having been set, as the detected current position moves to a point at or within a predetermined distance to the intersection having been set via the setting unit.