Map display system

A map display system including

• a map display apparatus to display a map based on map data having raster form that displays a map as an image, and
• a server to distribute the map data to the map display apparatus,
• the map display system comprising:
• a current position measuring processor that is provided in the map display apparatus and measures a current position of one of the map display apparatus and a vehicle mounted with the map display apparatus;
• a current position information transmission processor that is provided in the map display apparatus and transmits current position information indicating the current position measured by the current position measuring processor to the server;
• a course prediction processor that is provided in the server and predicts a course of one of the map display apparatus and the vehicle based on the received current position information;
• a course data transmission processor that is provided in the server and transmits course data indicating the course predicted by the course prediction processor to the map display apparatus, the course data having vector form;
• a position correction processor that is provided in the map display apparatus and corrects the current position measured by the current position measuring processor on the course specified by the received course data;
• a corrected position information transmission processor that is provided in the map display apparatus, settles, as a corrected position, the current position that the position correction processor corrects on the course, and transmits corrected position information indicating the corrected position to the server;
• a map data distribution processor that is provided in the server, specifies the corrected position based on the received corrected position information, and distributes the map data corresponding to a specified area containing the corrected position to the map display apparatus;
• and
• a map display processor that is provided in the map display apparatus and displays a map on a screen of a display portion based on the received map data.