| 摘要 |
PURPOSE:To provide an onboard navigation system that is capable of displaying the current positions of the vehicle in succession even if no distance data are available. CONSTITUTION:A control part 6 is provided with a nonvolatile memory 61 including a GPS flag. The GPS flag is set when no distance data are given from a distance sensor 2 with the vehicle having traveled a predetermined distance. The control part 6 constantly monitors the GPS flag, and when the GPS flag is set, a GPS mode, in which the current positions of the vehicle derived from GPS positions detected by a GPS receiver 5 irrespective of the distance data of the distance sensor 2 are displayed, is selected. Therefore, even if no distance data are available, the current positions of the vehicle can be displayed in succession, thus achieving a display screen that is easy to watch. Therefore, service to the driver can be enhanced. |
