Based on the rapid advance in ICT, developments and introductions of new services using new technology such as AIS Application Specific Messages are underway. These services will be useful for mutual relationship between encountered ships such as a collision avoidance support system. Recently, cost benefit analysis is required to introduce such a newly developed system. When evaluating cost benefit, the utility of the system is necessary. However, it is difficult to get the utility quantitatively because there is no experience of the new system enough for measuring its utility. Then we use subjective utility which comes from expert judgment. When we get the expert judgments, suitable experiences of the new system are necessary. Simulator run is one of the best ways to get the experience. To express mutual actions between encountered ships in a simulator, a control system for traffic ships is needed. The system includes not only a function for expressing traffic ship's motion, but also functions for expressing the effect of intelligent systems. In this paper, we introduce an automatic collision avoidance system and a framework for implementing the intelligent systems to a ship handling simulator by using inter-process communication and then discussed the results of simulation runs of three-ship-collision-scenario.
