| 摘要 |
PURPOSE:To form an accurate reproducible track line and to improve reliability by detecting the absolute position of a ship with a navigation device or a key input device, and drawing the track line with said absolute position as a starting point. CONSTITUTION:The absolute position data (X0, Y0) of a ship are detected from the input from a navigation device 5 or a reference-value input device 16. Then, a deviated bearing angle theta between a predetermined reference direction and the actual running direction of the ship is detected from the bearing data of a bearing sensor 1 in a CPU, and the bearing of the image of the ship's position is set. Then, the present position (X, Y) of the image of the ship's position on the coordinates at the absolute bearing is computed by a specified operating expression from the deviated bearing angle theta and a ship's speed V from a ship-speed output means 3 with the absolute position (X0, Y0) as a starting point. The constantly moving wake is displayed on a display device 6. Therefore, the reproducible data can be maintained, and the reliability can be improved. |
