Patent ID: 6381535
Filing Date: 2002-04-30
Classification: G01C,G08G

Abstract:
Interactive process for use as a real-time navigational aid by which a mobile terminal (1,2), with means of positioning (18,19) transmits, through a wireless network, itinerary requests to a fixed server (5) which transmits, in answer to the mobile terminal (1,2) and using the same network, itinerary data; characterized by the fact that the itinerary data comprise the latitudes and longitudes of at least one extremity of the straight line or arc segments forming the itinerary; by the fact that the mobile terminal (1,2) develops real-time guidance messages according to the position of the mobile terminal (1,2) compared to the itineraries received by the server (5); by the fact that, when answering the mobile terminal (1,2), the server (5) also transmits data concerning the roads intersecting with the itinerary; by the fact that, when answering the mobile terminal (1,2) the server (5) also transmits data concerning a proximity area around the itinerary; by the fact that if the mobile terminal (1,2) deviates from the itinerary by taking one of the intersections, the mobile terminal (1,2) obtains, without any additional connection to the server (5), a new itinerary according to its position and the data of the proximity area and transmits guidance messages to this effect; and by the fact that if the mobile terminal (1,2) leaves the proximity area, the mobile terminal (1,2) automatically transmits a new itinerary request to the server (5), a request which also includes data concerning the position of the mobile terminal (1,2).