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Navigation system

  • US 6,278,944 B1
  • Filed: 10/12/1999
  • Issued: 08/21/2001
  • Est. Priority Date: 07/26/1996
  • Status: Expired due to Term
First Claim
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1. A navigation system including:

  • a. GPS receivers for receiving positional information from a satellite system;

    b. at least one differential correction unit for determining a differential correction related to the received positional information;

    c. a digital map for providing navigational information, d. a user interface for indicating the positional and/or directional information to the user, the user interface including a human-to-human interface; and

    e. a portable two-way communication system;

    wherein at least one of the differential correction unit, the digital map and the user interface are loadable remote from the user and in communication with the user by means of the two-way communication system.

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