It is required to make ships renewable such as with high technology by taking modern techniques of electronic computors and controls, which is not at all inferior to airplane. When ships goes in harbor, captains becomes tense,when she goes in moderate ocean sea, he usually feels comfortable. It changes into rough sea condition, it is necessary for captains to operate her carefully. To avoid danger, his operating knowledges on ship performances and weather conditions is very important. His knowledges can be divided into three stages-recognition, judge and action process. Two intelligent systems are proposed as represented those processes. One is "Judge System of Dangerousness" based on results of seakeeping research, other is "Automatic Safety Navigation System" based on a production rule a kind of AI. To verify proposal systems, some simulation tests to avoid Typhoon moved across the ship route were carried out. In this report, results and discussions are presented.