NAVIGATION DEVICE, NAVIGATION SYSTEM, AND ROUTE GUIDANCE METHOD

A navigation device includes a map display unit configured to display a map on a first display device and display a guidance route and a current position on the map, and a scale determination unit configured to determine a scale of the map to be displayed on the first display device. The scale determination unit lowers the scale as the current position approaches an intersection at which it is required to turn, and enlarges the scale as the current position moves through the intersection.