Patent ID: 8150616

Claim:
A navigation apparatus comprising: a navigation means for calculating a guidance route and navigating along the calculated guidance route; a destination inference means for reading position information resulting from an act of a user taking place before an immediately preceding start-up and designating an inference destination point based on the read position information without receiving a direct and unique designation for a destination point by the user; a reference route calculation means for calculating a reference route to reach the designated inference destination point; a deviation detection means for detecting a deviation of a present position from the calculated reference route; a return detection means for detecting a return of the present position to the reference route after the deviation is detected; a record means for recording as a difference route a shift route from a deviation point where the deviation is detected to a return point where the return is detected; and a record cancellation means for canceling the recording of the shift route after the deviation is detected when a predetermined cancellation condition is satisfied before the return is detected, wherein in calculating a guidance route, the navigation means is configured to prioritize the difference route over another route, as a part of a guidance route including a segment from the deviation point to the return point, and wherein the cancellation condition is satisfied when a main power supply is not turned ON within a predetermined time period after being turned OFF.