초록 ▼

The invention provides a method and system for providing route guidance and other information from a base unit to a remote unit in response to a request from the remote unit. A query is formatted at the remote unit, the query including the request, and is transmitted from the remote unit to the base

The invention provides a method and system for providing route guidance and other information from a base unit to a remote unit in response to a request from the remote unit. A query is formatted at the remote unit, the query including the request, and is transmitted from the remote unit to the base unit. Requested route guidance information is calculated at the base unit in response to the query, using a large up-to-date database located at the base unit. A response to the query is formatted at the base unit, the response including route guidance information. The response is then transmitted from the base unit to the remote unit for display. The transmission is made in a compact form through the use of maneuver arms and combined maneuver arms and through the use of tokenized forms. A maneuver arm represents a road at an intersection, for depiction on a display, by one or two endpoint coordinates. The tokenized forms are expanded at the remote unit into textual driving instructions for each of one or more languages. In addition, the amount of information available at a remote unit can be increased by providing the remote unit with information from the base unit which is not adequately covered by any databases on-board the remote unit.

대표청구항 ▼

[ What is claimed is:] [1.] 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

[ What is claimed is:] [1.] 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).