Abstract: Provided is a technology for conducting route guidance with high accuracy regardless of type of terminal or the software environment in a navigation system in which an onboard apparatus displays route guidance information received from a portable terminal. The navigation system includes a self-contained navigation sensor mounted in a vehicle; a mobile terminal having a GPS receive and creating and sending route guidance information for a destination; and an onboard apparatus displaying the route guidance information received from the mobile terminal. The onboard apparatus creates a corrected current position based on a current position detected by the GPS receiver and position change information detected by the self-contained navigation sensors, and sends the corrected current position to the mobile terminal. The mobile terminal creates route guidance information based on the corrected current position and map information received from the onboard device.

Abstract: A trajectory display device includes: a display element; a current position detector; a memory for storing the current position successively; and a position determination unit for determining a plurality of certain actual distance trajectory points and a plurality of direction change points based on position data stored in the memory. The certain actual distance trajectory points are arranged at every actual distance defined by a scale of a map. The moving body changes a moving direction at each direction change point. The display element displays the trajectory including the certain actual distance trajectory points and the direction change points, which is overlapped over the map.

Abstract: A trajectory display device includes: a display element; a current position detector; a memory for storing the current position successively; and a position determination unit for determining a plurality of certain actual distance trajectory points and a plurality of direction change points based on position data stored in the memory. The certain actual distance trajectory points are arranged at every actual distance defined by a scale of a map. The moving body changes a moving direction at each direction change point. The display element displays the trajectory including the certain actual distance trajectory points and the direction change points, which is overlapped over the map.