A mooring system comprising a submerged buoy releasably connectable to a vessel keel having a combined axialradial bearing. Thus, the operational complexity during image encodingdecoding can be reduced. The image transmitting panel generates an image-formation plane for displaying a real image of the two-dimensional picture in a space located on an opposite side to the display unit with respect to the microlens array. The capacitive proximity sensor transmits a level detection output signal only when it detects the material, and it will switch the ultrasonic sensor on when it does not detect the material.