Patent ID: 7689353

Claim:
A navigation system comprising: a reader adapted to read map information for a predetermined wide area from a recording disk; a broadcast receiver adapted to receive a broadcast stream and using the broadcast stream to produce a first content, including at least one of a video signal and an audio signal, and a second content, including keyword information, the keyword information containing a plurality of keywords; a keyword recorder including a keyword dictionary containing a plurality of predetermined keywords associated with position information, corresponding to coordinates in the map information; a comparison unit adapted to match said keyword information with the plurality of predetermined keywords to identify at least one identified recorded keyword from the plurality of predetermined keywords; a positioning measuring unit adapted to determine a current navigational position; a position information searching unit adapted to identify at least one landmark, associated with the at least one identified recorded keyword, within a map image; and a display adapted to display the current navigational position within the map image and the at least one identified landmark within the displayed map image; wherein keywords in the keyword dictionary correspond to advertisers who are charged to associate landmarks with keywords, and thereby subsidize the cost of providing the map image information.