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Unit and program for displaying map

  • US 20040066316A1
  • Filed: 08/08/2003
  • Published: 04/08/2004
  • Est. Priority Date: 08/09/2002
  • Status: Active Grant
First Claim
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1. A map display unit including a first memory for storing map data and a drawing memory for drawing the map data and displaying display-area data of a drawing area in the drawing memory on a display, comprising:

  • data-decompressing means for reading and decompressing compressed map data stored in a data storage medium and storing the decompressed map data in the first memory;

    drawing means for drawing the map data stored in the first memory in the drawing memory; and

    display-control means for determining the display area and displaying the data on the display area of the drawing area in the drawing memory on the display, wherein, when there is no display-area data in the first memory, compressed map data including the display area is read out and decompressed from the data storage medium by the data-decompressing means.

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