PURPOSE: To facilitate grasping of a ship hull movement state by a method wherein a vector line computed through combination of a pair of rudders based on an indicated steering angle is displayed on a display, the movement direction of a ship hull to read the movement direction of a ship hull, the standard of the magnitude of a thrust, and a steering angle. ;CONSTITUTION: An indication signal from a controller 1 (a joy stick) is computed by an indication value computing circuit B and an indication revolving direction and an indication value to indicate the magnitude of an indication thrust are determined. The indication value is computed and processed by an image computing control circuit 20 and displayed as an indication vector value, at which the current static position of a ship hull forms an original point, on a display 21. Further, an actual steering angle signal from a steering angle oscillator is computed by an executing value computing circuit C to determine an executing value by which an executing revolving direction and the magnitude of an executing thrust are indicated. The image computing control circuit 20 effects computation, and a result is displayed as an executing vector value on a display 21 simultaneously with an indication vector value in a way that the current static position of a ship hull forms an original point.;COPYRIGHT: (C)1994,JPO&Japio
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