When VTS (Vessel Traffic Service) is applied in a narrow and congested water area of Japan, VTS operators are in charge of recognizing, using RADAR and ARPA, the motions of ships in the covered area and of giving safety information to officers on board. At present, they cannot actively order ships in the area how to maneuver to avoid collision or grounding. In the near future, we believe that VTS operators will be able to judge the possibility of collision or grounding, and to instruct officers on board to take concrete actions. At that time, it will be necessary to harmonize a sense of safety between ships' officers and VTS operators. In this paper, a 3-dimensional viewing system to show the situation of a ship in a water area is proposed to share the situation of awareness between ships' officers and VTS operators. The effectiveness of this system is verified by the experiment using the training ship "Fukae-maru".
