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Vehicle navigation assistance device having fast file access capability

  • US 6,058,390 A
  • Filed: 11/26/1996
  • Issued: 05/02/2000
  • Est. Priority Date: 11/26/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus for assisting a user in navigating a vehicle, the apparatus comprising:

  • a processor;

    a database including a data file, the data file including a plurality of data subsets having a logical sequence within the data file;

    a sensor subsystem coupled to the processor;

    an output subsystem coupled to the processor for outputting navigation information to the user;

    wherein the processor is configured to;

    compute a present location of the vehicle based on data from the sensor subsystem and the database; and

    cause the output subsystem to output an indication of the present location to the user; and

    wherein the processor is further configured to;

    determine the logical order of the data subsets within the data file from a first table, the first table including a plurality of references to the data subsets, wherein the plurality of references are arranged within the first table in a sequence different from the logical sequence of the data subsets within the data file; and

    store in consecutive locations of a second table the same plurality of references to the data subsets stored in the first table, according to the logical sequence of the data subsets within the data file.

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