A navigation system for a movable body wherein a map to be displayed on a screen can be selected freely in accordance with a request of an operator and, when an initial map displayed is restored, the operator can find out a current position of the movable body readily. The navigation system comprises...http://www.google.es/patents/US5089826?utm_source=gb-gplus-sharePatente US5089826 - Navigation system for movable body
