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:
May. 17, 2011
Filed:
Mar. 13, 2008
Tomoya Umemura, Okazaki, JP;
Kensuke Takeuchi, Okazaki, JP;
Tomoya Umemura, Okazaki, JP;
Kensuke Takeuchi, Okazaki, JP;
Aisin AW Co., Ltd., , JP;
Abstract
A navigation apparatus and method increase the upper limit for the number of times map data may be written into a portable storage medium. A CPU reads an initial radius and an additional radius increment from a ROM and repeatedly adds the additional radius increment to the initial radius to obtain, with each addition, a new calculated radius centered on coordinates of a central geographic point of a map data extracting-region. The map data for each secondary grid unit within the map data extracting-region is sequentially read out from a CD-ROM. Then, when the map data within the incrementally enlarged map data extracting-region exceeds the maximum storage capacity of the SD memory card, the CPU deducts the last added increment of radius from the calculated radius to obtain a map region to be stored. The CPU sequentially reads out from the CD-ROM the map data for each grid unit within the map region to be stored and sequentially writes the grid units of map data into the SD memory card.