Navigational information displaying device, navigational information displaying method, and a non-transitory computer-readable medium

A navigational information displaying method, comprising the steps of:

• sequentially acquiring first geographic coordinates of a first ship that travels on the sea;
• generating a first object indicative of the first ship, the first object being placed at first indication coordinates corresponding to the first geographic coordinates in an image of a virtual three-dimensional space for indication displayed on a display unit;
• generating a first window, the first window graphically connected to the first object and moving in the image of the virtual three-dimensional space for indication in association with movement of the first object or the indication viewpoint;
• accepting a specification of second indication coordinates in the image of the virtual three-dimensional space for indication from a user;
• generating a second window graphically connected to the second indication coordinates;
• acquiring second geographic coordinates corresponding to the second indication coordinates;
• calculating navigational information including a distance between the first geographic coordinates and the second geographic coordinates;
• and
• displaying the first object, the first window, the second window, and the navigational information in the image of the virtual three-dimensional space for indication, and controlling so that the first window and the second window do not overlap with each other.

A non-transitory computer-readable medium having stored thereon computer-executable instructions which, when executed by a computer, cause the computer to:

• sequentially acquire first geographic coordinates of a first ship that travels on the sea,
• generate a first object indicative of the first ship, the first object being placed at first indication coordinates corresponding to the first geographic coordinates in an image of a virtual three-dimensional space for indication displayed on a display unit,
• generate a first window, the first window indicating graphically connected to the first object and moving in the image of the virtual three-dimensional space for indication in association with movement of the first object or the indication viewpoint,
• accept a specification of second indication coordinates in the image of the virtual three-dimensional space for indication from a user,
• generate a second window graphically connected to the second indication coordinates,
• acquire second geographic coordinates corresponding to the second indication coordinates,
• calculate navigational information including a distance between the first geographic coordinates and the second geographic coordinates, and
• display the first object, the first window, the second window, and the navigational information in the image of the virtual three-dimensional space for indication, and controlling so that the first window and the second window do not overlap with each other.