| 摘要 |
PROBLEM TO BE SOLVED: To obtain a filter device in which GPS data containing an erroneous present position is detected by GPS data which is outputted sequentially from a GPS receiver. SOLUTION: In a filter part 11, the ratio of a vehicle speed specified by vehicle-speed information contained in GPS data to a vehicle speed obtained by a vehicle speed sensor 5 installed at a vehicle is compared with a prescribed value regarding GPS data which is outputted sequentially from a GPS receiver 6. Then, according to a compared result, whether the GPS data is outputted to a navigation processing part 12 or not is decided. |
