Patent ID: 7689352
Filing Date: 2010-03-30
Classification: G01C,G08G

Abstract:
1. A navigation system for designating a guide route from a start position via an intermediate position to a destination to perform a route guidance by using map data obtaining means for obtaining map data and position obtaining means for obtaining a current position of the vehicle, the navigation system comprising: a route storage unit configured to store the guide route including the intermediate position and the destination, the stored guide route being kept stored even in case that an ignition switch of the vehicle is turned from an on state into an off state; distance measuring means for measuring using the map data, when the ignition switch is turned from the off state into the on state, a distance to the intermediate position, which is included in the guide route stored in the route storage unit, from a current position where the ignition switch is turned from the off state into the on state; determining means for determining whether the measured distance to the intermediate position is within a predetermined distance; inquiring means for inquiring of a user, when the measured distance is determined to be within the predetermined distance, whether or not the intermediate position is regarded as having been passed by; an input unit configured to be used for the user to indicate a response to the inquiring by the inquiring means; and re-routing means for executing a re-routing to retrieve, while excluding the intermediate position, a new guide route from the current position to the destination in the guide route stored in the route storing unit when the user indicates that the intermediate position is regarded as having been passed by via the input unit, wherein when the user indicates that the intermediate position is not regarded as having been passed by, the route guidance is started based on the guide route stored in the route storage unit.