A method and system of deriving a travel distance of an object which travels, comprising the steps of: measuring a forward travel velocity of the object under forward travel; discriminating whether or not the measured forward travel velocity is greater tha...

A method of correcting a present position of a movable body onto a position on a route (RD), where said movable body is supposed to exist, corresponding to the present position for use in a navigation system (S) for navigating said movable body, characteri...