Patent ID: 7765063

Claim:
A navigation method performed by a portable navigation device, comprising: reading map information for a predetermined wide area from a recording disk; receiving a broad cast stream having a navigation message producing, from the broadcast stream, 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; recording a plurality of predetermined keywords associated with position information, specified in the map information data; matching said keyword information with the plurality of predetermined keywords for finding at least one identified recorded keyword consistent with the keyword information, and upon matching said keyword information with the plurality of predetermined keywords: automatically determining a current navigational position of the portable navigation device; automatically identifying at least one landmark, associated the at least one identified recorded keyword, within a map image; and automatically displaying the current navigational position within the map image and the at least one identified landmark within the displayed map image.