Patent ID: 6873905
Filing Date: 2005-03-29
Classification: G01C,G08G

Abstract:
1. A communications-type navigation device, comprising: a position measuring unit which measures a position of a self-terminal device; a destination place setting unit which sets destination place information; a communicator which performs transmission/reception of map data including at least one of wide area map data and detailed map data with an information center; a route guide which performs route guidance to said destination place; and a driving state monitor which monitors a driving state of a self-vehicle, wherein said communicator transmits, to said information center, present place information obtained by said position measuring unit, said destination place information as set by said destination place setting unit and download area information, which is modified dynamically depending on the driving state of the self-vehicle indicated by said driving state monitor, to download a larger area of map data when the self-vehicle is operated at high speed, and receives route information and guiding point information up to said destination place which have been transmitted from said information center, and wherein said route guide includes a judging unit which judges whether or not said self-terminal device has deviated from said route from said received route information and said position information measured by said position measuring unit, and a determining unit which determines, if said self-terminal device is judged to have deviated, whether or not to request said information center to perform a route calculation to said destination place according to an input to a prompt by a user in correspondence with said driving state detected by said driving state monitor.