Construction of the Safety Route Search System Contributes to Reduce Marine Accident

The authors constructed a system for safety navigation using a System Dynamics computer simulation. The algorithm for judgment of searching route includes "The International Regulations for Preventing Collisions at Sea (COLREGs)". The system of this research includes several factors that used by ships' officers, such as “Bumper Model” and "CPA and TCPA". In most of existing systems, the route is analyzed by moving on inflexible positions which were defined by cells or nodes beforehand. In the system constructed, it's possible to analyze high precise route searching by defining ships' positions with longitude-and-latitude. The system can analyze with high precision routes by referring ship specifications. In this research the authors compare route searched by the system with actually route that extract from Automatic Identification System (AIS) record. The authors evaluated risk of each route using "SJ Values (Subjective Judgment Value)" and reached the conclusion that the system can search safer route than actually route.