Patent ID: 7818121

Claim:
In a navigation system having an output screen, a method for reducing the zigzag effect of rerouting a user in a vehicle from an existing route between a first location and a second location, comprising: calculating an existing route between the first location and the second location; displaying the calculated existing route in the output screen; acquiring traffic information from a remote location; determining whether to reroute the vehicle to a new route based on the acquired traffic information; calculating the new route based on the acquired traffic information, if it is determined to reroute the vehicle to the new route; comparing the calculated new route with the existing route between the first location and the second location; determining a number of times the new route has been rerouted back to the existing route; continuing to display the existing route in the output screen, if the number of times is more than a predetermined number; and displaying the new route in the output screen, if the number of times is less than or equal to the predetermined number.