Abstract: A display device is provided for displaying an operating state of a hybrid system that drives a propulsion machine which propels a ship. The display device includes a display screen for displaying the operating state. The display screen includes symbols that represent constituent elements constituting the hybrid system, and linear sections that connect the plurality of symbols and change an illumination state according to an operating mode of the hybrid system.

Abstract: A control method for a watercraft is used for the watercraft including a device that requires authentication of identification information for activation, and has reading processing, authentication processing, and activation permission processing. In the reading processing, the identification information is read by each of plural reading sections, each of which is mounted on a hull of the watercraft and can read the identification information. In the authentication processing, the identification information, which is read in the reading processing, is authenticated by referring to authentication information. In the activation permission processing, in the case where the identification information that is read by any one of the plural reading sections is successfully authenticated, the device is brought into an activatable state.

Abstract: A ship handling device executing dynamic positioning control with which the fixed-point maintaining accuracy including measurement accuracy of a satellite positioning system can be assessed. In this ship handling device for maintaining a ship body at a target position using a GNSS (Global Navigation Satellite System) device, a positioning accuracy level of the GNSS device is calculated based on a radio-wave reception state of the GNSS device, a fixed-point deviation amount level is calculated based on a fixed-point deviation amount calculated based on the target position and a measured position measured by the GNSS device, and a fixed-point maintaining accuracy level indicative of an assumed range of an absolute position of the ship body relative to the target position is determined with reference to the positioning accuracy level and the fixed-point deviation amount level.

Abstract: A ship handling device executing dynamic positioning control with which the fixed-point maintaining accuracy including measurement accuracy of a satellite positioning system can be assessed. In this ship handling device (7) for maintaining a ship body (1) at a target position (Y) using a GNSS (Global Navigation Satellite System) device (13), a positioning accuracy level (19) of the GNSS device is calculated based on a radio-wave reception state of the GNSS device, a fixed-point deviation amount level (20) is calculated based on a fixed-point deviation amount calculated based on the target position and a measured position (X) measured by the GNSS device, and a fixed-point maintaining accuracy level (21) indicative of an assumed range of an absolute position (Z) of the ship body relative to the target position is determined with reference to the positioning accuracy level and the fixed-point deviation amount level.