Update detection device and update detection program

摘要: During power-on of a navigation device, control circuit executes an investigation process for determining whether backup data stored in memory should be erased. In this process, the confirms that first determination or second is affirmed, based on large volume storage medium being presently attached. The attached substituted during power-off while information updated power-off. Affirming judged from use restriction applied to medium, serial number accords with and password device can access medium.