Patent ID: 6807484
Filing Date: 2004-10-19
Classification: G01C

Abstract:
A navigation system for a vehicle, the navigation system comprising:a position data receiving means for receiving at least one set of position data from a hand-held terminal, wherein each of the at least one set of position data indicates a corresponding position of the hand-held terminal; a position data acquiring means for acquiring successive sets of position data based on a GPS signal transmitted from at least one GPS satellite, wherein each of the successive sets of position data indicates a corresponding position of the vehicle; and a control means that executes at least one predetermined process based on at least one of the successive sets of the position data, which are acquired by the position data acquiring means, wherein: the control means checks existence of the continuity between a current set of position data and the previous set of position data, both of which are acquired by the position data acquiring means at a predetermined interval; when the control means determines that the continuity between the current set of position data and the previous set of position data, both of which are acquired by the position data acquiring means, exists, the control means determines a current position of the vehicle based on the current set of position data and the previous set of position data, both of which are acquired by the position data acquiring means, and when the control means determines that the continuity between the current set of position data and the previous set of position data, both of which are acquired by the position data acquiring means, does not exist, the control means uses the current set of position data, which is acquired by the position data acquiring means, and one of the at least one set of position data, which is received from the hand-held terminal, only upon existence of continuity between the current set of position data, which is acquired by the position data acquiring means, and the one of the at least one set of position data, which is received from the hand-held terminal.