NAUTICAL CHART DISPLAY DEVICE, NAUTICAL CHART DISPLAY METHOD, AND NAUTICAL CHART DISPLAY PROGRAM

The purpose is to provide a nautical chart display device which enables to easily grasp a direction centering on a reference position. The nautical chart display device includes a display, a detector, a directional symbol displaying module, and a directional symbol changing module. The display displays a nautical chart on a screen. The detector detects an operation to the screen. The directional symbol displaying module displays, on the display so as to be superimposed on the nautical chart, a directional symbol in which directional markers arranged in a circle and the center of the circle are indicated. The directional symbol changing module moves the directional symbol according to an operation to the directional symbol.