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Data terminal device

  • US 7,471,952 B2
  • Filed: 06/26/2003
  • Issued: 12/30/2008
  • Est. Priority Date: 07/01/2002
  • Status: Active Grant
First Claim
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1. A data terminal device comprising:

  • a position data receiving part for receiving position data transmitted from an artificial satellite;

    a wireless part for transmitting and receiving data with respect to a base station;

    a detailed map data memory part for storing detailed map data received by the wireless unit;

    a scale determining part for determining the scale of the road map according to a plurality of position data received a plurality of times by the position data receiving part; and

    a display part for displaying the road map of the scale determined by the scale determining part and detailed map data stored in the memory part; and

    a moving direction determining part for determining the moving direction based on the position data received a plurality of times by the wireless part; and

    in which the wireless part receives detailed map data only with respect to the moving direction determined by the moving direction determining part.

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