Retrieval and small correction system for sailing directions using the Internet

In this paper, we propose an automatic retrieval and small correction system for Japanese Sailing Directions using the Internet. There are two kinds of retrieval methods. One is the retrieval with a keyword, and the other is retrieval with ship´s sailing route. The system is easily able to materialize automatic small corrections, for example revisions and additions for new navigational information. In the database of main body are divided many files. They have file names and ID. The ID is number of date and time. If there is different ID between own ship´s database and the Maritime Safety Agency´s one, the system execute automatically small corrections comparing with their names and ID under operation of the Internet. The programs of the system are composed Java applets, and they are easy to work in the Internet under httpd operation. These technologies are useful for LAN construction within a future ship. If the Maritime Safety Agencies in the world offer the HTML database and tables by using CD-ROM, our proposal system is made practicable as soon as possible