Patent ID: 6999871

Claim:
A vehicle navigation system comprising: a hard disk drive, in which an old navigation software set is stored; an optical disk drive which is accessible to an optical disk which stores a new navigation software set; a first executing section which drives said hard disk drive; a second executing section which drives said optical disk drive; and an install section responsive to a navigation instruction to control said first executing section to drive said hard disk drive such that a vehicle navigation is carried out based on said old navigation software set, when said optical disk is not available, and to control said second executing section to drive said optical disk drive such that the vehicle navigation is carried out based on said new navigation software set and said first and second executing sections to drive said hard disk drive and said optical disk drive such that said new navigation software set is installed from said optical disk into said hard disk drive, when said optical disk is available, wherein said install section controls said first and second executing sections to stop the installation of said new navigation software set, when a predetermined vehicle state is detected.