Patent ID: 6107944
Filing Date: 2000-08-22
Classification: G01C,G08G

Abstract:
A method of expanding the amount of information available to a remote unit in a routing system having a base unit and a remote unit, comprising the steps of:(a) electromagnetically transmitting a route request from the remote unit to the base unit;(b) electromagnetically transmitting data representing a route from the base unit to the remote unit in response to the route request of step (a);(c) receiving in the remote unit the data representing a route transmitted in step (b);(d) in the remote unit, using a navigation application program to compare the data representing a route received in step (c) with coverage of databases on-board the remote unit;(e) if an entire route received in step (c) is not covered by said databases on-board the remote unit, electromagnetically transmitting from the remote unit to the base unit a request for the base unit to provide information in addition to that which is covered by said databases on-board the remote unit; and(f) receiving in the remote unit said information in response to the request of step (e).