HDD navigation system

Car navigation systems have been evolving since the first type GPS navigation system was launched. The increasing amount of map data and related information have been stored on CD-ROM disks and DVD-ROM disks. In the latest HDD navigation system, the map data is stored on HDD, so the driver can operate navigation and the passenger in the rear seats can enjoy watching DVD-video at the same time. We describe the basic technologies of the HDD car navigation system that has many functions for operating as a navigation and music server. The functions provided by the system include a three-dimensional map using a geometry engine on a graphic display controller (GDC), route guidance, voice recognition of the navigation commands and encoding and decoding of music stored on the HDD.