A method of controlling a vehicle navigation system may entail inquiring if the navigation system is displaying a road map in a first map scale on a display, inquiring if a scrolling feature was used to pan the road map in the first map scale on the display to a specific scrolled point, concluding that the scrolling feature was used, calculating a detail road display area based on the specific scrolled point of the display; loading detailed road link data in a second map scale from memory of the navigation system, the detailed road link data corresponding in actual geographic area to the detail road display area, converting the detailed road link data from the second map scale to the first map scale to create converted detail road link data, and displaying the converted detail road link data together with the road map in the first map scale.