Abstract: An onboard vehicle navigation system as described herein is enhanced with data obtained from an interactive computer-based mapping application, which may be readily available from one or more websites. The mapping application generates mapping data that indicates a desired destination and/or a proposed route to that destination. The mapping data is stored in a portable data storage device, such as a USB flash memory device, which can be connected to a data port on the vehicle. The mapping data can be downloaded to the onboard vehicle navigation system from the portable data storage device and used in lieu of programming inputs that would otherwise have been entered by the operator of the vehicle.