Recently, various minimum time maneuvering problems including course altering problem, berthing one, parallel shifting one etc. have been numerically solved. In order to realize the minimum time maneuvering method in safety and in certainty, however, it is necessary to have some maneuvering support system. This paper is described on such a supporting system that a maneuver can interrupt if necessarily and give appropriate signals to the control actuators during the automatic minimum time maneuvering. And to demonstrate the effectiveness of this system, a result of actual sea test is shown.