Patent ID: 8103450
Filing Date: 2012-01-24
Classification: G01C

Abstract:
1. A navigation apparatus comprising: a speed calculation section that calculates, in accordance with a predetermined calculation method, a current speed of a mobile object at predetermined intervals, based oil the mobile object's initial speed detected at the start of the calculation; a travel distance calculation section that calculates a travel distance the mobile object has traveled so far since the start of the calculation, by using the current speed; a current speed error range calculation section that calculates, based on the calculation method, a current speed error range of the current speed by using an initial speed error range of the initial speed; a distance error range calculation section that calculates a travel distance error range of the travel distance by using the current speed error range; a reliability evaluation section that evaluates, based on the travel distance error range, the reliability of the travel distance; and a control section that performs a navigation process corresponding to the reliability of the travel distance.