A navigation system and a method therefor arranged to be mainly adapted to a driver but the same is as well as adapted to a pedestrian as a portable type according to an embodiment in which devices such as a distance sensor and an azimuth sensor are not used. When information about the passage through...http://www.google.fr/patents/US5351059?utm_source=gb-gplus-shareBrevet US5351059 - Navigation system and method therefor
