Patent ID: 8203578

Claim:
A map scroll method for a navigation system, comprising the following steps of: receiving a scroll signal from an input device operated by a user for scrolling a map image on a monitor screen of the navigation system; checking a current condition for applying a smooth scroll operation; and conducting the smooth scroll operation in response to the scroll signal while adjusting a scroll angle of the map image on the monitor screen based on the current condition; wherein the current condition includes an angle of scroll direction change where the smooth scroll operation is conducted when the angle of scroll direction change is within a predetermined range; and wherein said step of conducting the smooth scroll operation further includes the following steps of: determining an amount of scroll direction bias which is an angle to be added in a step by step manner to a previously specified scroll direction when the angle of scroll direction change is within the predetermined range; determining an amount of update frequency which is a number of times that the scroll direction is updated or modified by adding the scroll direction bias; and adding the amount of the scroll direction bias to the previously specified scroll direction by the number of times defined by the update frequency.