The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 2004
Filed:
Apr. 02, 2001
Applicant:
Inventors:
Kouichi Nagaki, Tsurugashima, JP;
Tomoo Watanabe, Tsurugashima, JP;
Assignee:
Pioneer Corporation, Tokyo-to, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01C 2/130 ; G06F 1/200 ;
U.S. Cl.
CPC ...
G01C 2/130 ; G06F 1/200 ;
Abstract
A navigation system performing navigation based on a detected current position and map data is provided. The navigation system includes a storage device, a navigation control device, and a defragmenting processing device. The storage device is nonvolatile. Files of map data are able to be read from it, and to be written into it. The navigation control device controls a navigation operation using the map data. Then, the defragmenting processing device performs a defragmenting processing with the storage device at a predetermined time.