Local access and wireless downloading combined map navigation method

The invention discloses a local access and wireless downloading combined map navigation method, which is to provide navigation by using a local access and wireless downloading combined map processing mode, namely using a loaded grid map first and if the grid map of a required ID is not downloaded, extracting from local map data. The mode can ensure good user experience during map browsing and navigation and can reflect latest road condition and traffic information, so the navigation process can be carried out effectively and smoothly in time; and the adoption of the map data in the same data format by a navigation center and vehicle-mounted terminals enables the grid map data needed by the vehicle-mounted terminals to be acquired locally and directly or downloaded from the connected network navigation center, so the display and process mechanism of the map is more flexible and the locally stored map data of the vehicle-mounted terminals can be updated more conveniently with automatic update display for provid