Patent ID: 7596449

Claim:
A display correction method for a vehicle navigation system, the vehicle navigation system including a gyroscope, a display screen and an e-map database, the gyroscope generating an angle of driving direction, the e-map database including plural road links, the display correction method displaying a sign, which is indicative of a vehicle, on a display location of the display screen, the display correction method comprising the steps of: (A) extracting a current display location; (B) reading both a first road link corresponding to the current display location and at least one second road link connected to the first road link from the e-map database; (C) extracting a next vehicle location; (D) selecting road links which have a distance smaller than a first specific distance from the next vehicle location, from the first and second road links to thereby generate a first set of road links; (E) if the first set of road links contains one or more road links, setting the angle of driving direction generated by the gyroscope to become a next angle of driving direction; (F) selecting road links which have an angle difference smaller than a first specific angle from the next angle of driving direction, from the first set of road links to thereby generate a second set of road links; (G) if the second set of road links contains one or more road links, computing vertical distances from the next vehicle location to each of the one or more road links in the second set of road links, selecting a road link with a shortest vertical distance, and setting a projection point of the next vehicle location on the road link with the shortest vertical distance to become a next corrected location; and (H) displaying the sign, which is indicative of the vehicle, on the display screen at a next display location which indicates a position of the display screen corresponding to the next corrected location.