Patent ID: 8311735
Filing Date: 2012-11-13
Classification: G01C

Abstract:
1. A navigation system provided with a position detecting unit for detecting a current position of a vehicle, a map data storing unit for storing map data about roads, a display data generating unit for reading map data about a surrounding area from said map data storing unit based on the current position of the vehicle detected by said position detecting unit, and for generating data for display, a display unit for displaying the data for display generated by said display data generating unit, and a control unit for controlling functions of the navigation system, wherein an update map data acquiring unit for acquiring update map data is disposed, and, while said control unit is using a navigation function using yet-to-be-updated map data stored in said map data storing unit, said navigation system updates the map data by writing the update map data from said update map data acquiring unit in a free space on said map data storing unit, and wherein when judging that the navigation function is not needed according to an instruction from a user, the control unit stops the navigation function, and focuses its capability toward writing the update map data in said map data storing unit so as to update the map data.