Patent ID: 6738710
Filing Date: 2004-05-18
Classification: G01C,G01S

Abstract:
A navigation system comprising:a present position detecting device for detecting a present position; a first memory device for reading map data from a record medium in which the map data is recorded; a second memory device of non-volatile type, to which the map data can be written and from which the map data can be read; a navigation controlling device for controlling a navigation operation in correspondence with the detected present position by using the map data, and sending a transfer command to transfer the map data from said first memory device to said second memory device at a predetermined timing; and a transfer interface for controlling an operation of reading the map data from said record medium by said first memory device and an operation of transferring the map data to said second memory device, in accordance with the sent transfer command, wherein the operation of reading the map data from said record medium by said first memory device and the operation of transferring the map data to said second memory device are performed through an exclusive bus which is not utilized by said navigation controlling device, and wherein said transfer interface comprises: a command converting device for converting a type of the sent transfer command to thereby generate a command, which is identifiable by said first memory device and said second memory device; and a transfer controlling device for controlling the operation of transferring the map data from said first memory device to said second memory device, on the basis of the generated command.