| 摘要 |
A navigation system is configured in which a driven distance calculating unit of an on-vehicle device calculates a first driven distance in a predetermined section based on vehicle speed calculated using vehicle speed pulses outputted from a vehicle and a vehicle speed calculation coefficient, a driven distance calculating unit of a portable terminal device calculates a second driven distance of the vehicle in the predetermined section based on GPS information provided from global navigation satellites, a learning unit corrects the vehicle speed calculation coefficient based on the result of comparing the first driven distance with the second driven distance, and a vehicle location predicting unit of the portable terminal device predicts a vehicle location based on the vehicle speed calculated using the vehicle speed pulses and the corrected vehicle speed calculation coefficient. |
