1. A non-transitory recording medium storing an image processing program including instructions to be executed by a computer, the computer being connected with an image formation device configured to output image on a recording medium, the instructions causing the computer to function as an image processing device which comprises: a data obtaining unit configured to obtain map image data from a map image data provider, the map image data representing a basic map image showing a geographic area; an area identifying unit configured to identify a basic image formation area and a surplus area, the basic image formation area and the surplus area being an area within an image forming area on the recording medium, the basic map image being formed on the basic image formation area, the surplus area being an area within the image forming area but the basic map image is not formed; an additional data obtaining unit configured to obtain map image data necessary for covering an enlarged image formation area, which is an area including the basic image formation area and at least part of the surplus area, from the map image data provider; and a controlling unit configured to control the image formation device to output the enlarged map image on the recording medium based on the map image data additionally obtained from the map image data provider, wherein the map image data for covering the enlarged image formation area represents a map image at a larger scale than the basic map image.