Navigation Device

A navigation device, comprising:

• a map display unit that displays a large-area map screen showing a large-area map and that displays an enlarged map screen showing a partial enlarged map obtained by enlarging a partial region of the large-area map in superposition on the large-area map screen at a display position of the partial region;
• a speed calculation unit that calculates a speed pertaining to movement of the enlarged map screen;
• an enlarged map creation unit that creates an enlarged map obtained by enlarging a predetermined region including the partial region of the large-area map based on vector data of a detailed map obtained by enlarging the large-area map;
• and
• a selection unit that selects the partial region of the large-area map as the partial enlarged map when the speed pertaining to the movement is no lower than a reference speed and that selects a region of the enlarged map, corresponding to the partial region, as the partial enlarged map when the speed pertaining to the movement is lower than the reference speed.