| 摘要 |
PROBLEM TO BE SOLVED: To provide a navigation system capable of smoothly performing navigation with a reduced processing burden by mounting a hard disk for storing map data transferred from a recording medium. SOLUTION: When a CPU 11 of the navigation system sends out a transfer command signal St to a transfer interface part 30, a command conversion part 32 produces, under control of a transfer control part 31, a plurality of commands Cd that can be identified by an external disk device based on the command signal St. The map data recorded in a DVD-ROM 1 is read out by a DVD-ROM drive 14 and temporarily held at a specified address of a buffer RAM 34. The map data is read out from the buffer RAM 34 and stored in the hard disk 15. The address by which the buffer RAM 34 is accessed is given by an address generating part 33. By this, desired map data is transferred to the hard disk 15 and, from this on, navigation can be performed using the map data in the hard disk 15. |
