MOBILE SYSTEM AND MAP STORAGE DEVICE WITH COMMUNICATION FUNCTION

PROBLEM TO BE SOLVED: To prevent occurrence of redundancy in error detection in a technology for acquiring map data for map display from a center by communication.SOLUTION: When map area data to be downloaded and an error correction code are transmitted from a center, an HCI 12 in a map storage device 6 executes control so that the map area data and the error correction code are written in a map storage medium 8 through an RX buffer 13d and a switch circuit 13f. When receiving an instruction for reading out the downloaded map area data from the map storage medium 8 from a navigation apparatus, the HCI 12 executes control so that the map area data and the error correction code stored in the map storage medium 8 are inputted to an ECC circuit 13e through the switch circuit 13f and the RX buffer 13d. The ECC circuit 13e executes error correction of the inputted map area data by using the inputted error correction code and outputs the error-corrected map area data to the navigation apparatus.