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Map data distribution system and map data acquisition device suitable for such system

  • US 6,052,645 A
  • Filed: 06/25/1998
  • Issued: 04/18/2000
  • Est. Priority Date: 07/17/1997
  • Status: Expired due to Fees
First Claim
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1. A map data distribution system including abase station and a transportable device linked with each other through communication means, wherein map data distributed from said base station is acquired from said transportable device,said transportable device comprising:

  • traveling condition detection means for detecting a traveling condition of said transportable device; and

    request means for sending a request to said base station for detailed map data of an area surrounding or neighboring said transportable device when a detailed map of the area is determined to be required based on the detected traveling condition;

    whereinsaid base station responds to the request from said transportable device by supplying the detailed map data of the area indicated in the request.

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