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Interface layer for navigation system

  • US 6,173,277 B1
  • Filed: 09/07/1999
  • Issued: 01/09/2001
  • Est. Priority Date: 10/25/1996
  • Status: Expired due to Term
First Claim
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1. In a navigation system that includes application programs that provide navigation-related functions, wherein the navigation system uses geographic data stored on a computer-readable medium, interface layer programming comprising:

  • a query subsystem that accepts requests for geographic data from the application programs and provides responses thereto;

    an indexes management subsystem that identifies a location of data on the medium at which is located data required to respond to said requests received by said query subsystem;

    a physical-to-logical subsystem that transforms data read from the medium into a format used in said responses; and

    a resources management subsystem that provides access to memory resources and I/O of the navigation system for use by said query subsystem, said indexes management subsystem, and said physical-to-logical subsystem.

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