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Navigation data storage on compact disk

  • US 5,101,357 A
  • Filed: 01/23/1990
  • Issued: 03/31/1992
  • Est. Priority Date: 02/14/1989
  • Status: Expired due to Term
First Claim
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1. In a vehicular navigation and data retrieval system including on-boarda navigation system (1) anda compact disk (CD) player (2) coupled to said navigation system and adapted to hold, and selectively retrieve data from, at least one audio CD (3) and at least one navigation data CD,a method of retrieving, from disk, navigation data for use by said navigation system (1),comprising the steps of:

  • determining whether said navigation system has an immediate need for navigation data from said data CD (4), that is, whether vehicle position has reached an edge of a map section previously stored in said navigation system;

    discriminating, from data stored on said audio CD, when said CD player (2) is playing an audio selection from said audio CD (3) and when said player is in a pause adjacent to an audio selection; and

    directing said CD player (2) to cease playing said audio CD (3) and start retrieving navigation data from said data CD only when said player is in a pause, unless said navigation system has said immediate need and, in the event of such need, interrupting said audio selection to permit navigation data retrieval.

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