| 摘要 |
PROBLEM TO BE SOLVED: To provide a navigation device which can build the concerned data into a route calculation based on using frequency of stored travelled route data. SOLUTION: A memory point judgement means 34 judges whether at least one of self-vehicle location and destination is located in peripheral region of memory point. When at least one is located in peripheral region of memory point corresponding to each, an accumulated data determination part 36 judges whether the travelled route data of circumference of concerned each memory point are stored in a memory part 13. When it is judged that it is accumulated in the memory part 13, it discriminates whether sufficient data quantity is acquired at the time when a data quantity discrimination part 37 is applying the concerned data to the route calculation from the history of this stored travelled route data. And in a certain case, data is enough, a travelled route data application part 38 constructs this travelled route data to the route calculation. COPYRIGHT: (C)2008,JPO&INPIT |
