| 摘要 |
PROBLEM TO BE SOLVED: To ensure arrival at a destination even when a current position deviates from an object route road by setting a departure point on the object route road where the current position was shown last, when the current position is not found on the route object road. SOLUTION: When a current position is on an object route road, a control device 6 updates and records a link ID for the route and current position coordinates in an nonvolatile memory 6a. On the other hand, when a vehicle deviates from an indicated road, or a link for the road is not a route link even with the vehicle on the displayed road, the current position is regarded as not on the object route road, and data in the nonvolatile memory 6a is not updated. Consequently, the latest route link ID and current position coordinates are saved in the nonvolatile memory 6a. In other words, the nonvolatile memory 6a saves the route link ID and current position coordinates for the object route road where the vehicle last existed. Therefore, a destination is set via an operation part 5. |
