Navigation apparatus

A navigation apparatus comprising:

• a map database that records map data in a fixed storage medium;
• a map data read section for reading the map data from the map database;
• a navigation section for detecting the location of a local apparatus, calculating a route to a destination specified by a user, and giving guidance to the destination according to the route;
• a map information acquisition section for acquiring map information from outside the navigation apparatus;
• a map information update section for updating the map database with the map information acquired by the map information acquisition section, wherein the map information update section comprises a difference data detecting section for detecting modified data as the difference between the map data read by the map data read section and the map information acquired by the map information acquisition section;
• and
• a map information merging section for merging map data read by the map data read section and map information acquired by the map information acquisition section to generate updated map data, wherein the navigation section comprises an emphasis display section for displaying the modified data detected in the difference data detecting section in an emphasized way such that displayed map data read by the map data read section is distinguishable from displayed map information acquired by the map information acquisition section.

A navigation apparatus comprising:

• a map database that records map data in a fixed storage medium;
• a map data read section for reading the map data from the map database;
• a navigation section for detecting the location of a local apparatus, calculating a route to a destination specified by a user, and giving guidance to the destination according to the route;
• a map information acquisition section for acquiring map information from outside the navigation apparatus;
• a map information update section for updating the map database with the map information acquired by the map information acquisition section, wherein the map information update section comprises a difference data detecting section for detecting modified data as the difference between the map data read by the map data read section and the map information acquired by the map information acquisition section;
• and
• a map information merging section for merging map data read by the map data read section and map information acquired by the map information acquisition section to generate updated map data, wherein the navigation section comprises an emphasis voice guidance section for providing emphasized voice guidance of the modified data detected in the difference data detecting section.