Design Pattern In Electronic Chart Display And Information System

With the development of marine technology, navigation technology and computer technology, navigation is becoming more and more electronic, automatic, and supported by more and more software system. ECDIS (Electronic Chart Display and Information System) is the representative product of the navigation software. It can display and manipulate charts, make navigation schemes, prepare routes, monitor navigation, and carry out other marine operations. ECDIS makes navigation information more intuitive for operators and provides strong security guarantees.The topic comes from the actual ECDIS project of China State Shipbuilding Corporation. The project has finished a set of international standards-based ECDIS, and has developed the extension version based on international standards. The author participated in the design and development of key modules in ECDIS. During the development of the system, the project team has used design pattern and its thinking of Object-Oriented to do comprehensive design for the system. Project team tried to make sure that the system has good maintainability, scalability, previously developed module has good compatibility, and minimum cost to upgrade. The ECDIS is needed to be continuously optimized, so design pattern is needed in the design, development and reconstruction of the system.This paper makes a detailed description for the electronic chart, applications based on electronic chart, and the development history of them. The paper analyses the requirements of ECDIS, and uses design pattern to design and develop the key modules. The paper discusses the key problems encountered in the design and development of the system from the perspective of design pattern in detail.The ECDIS of international standard version we developed has been delivered to customers and installed on some offshore ships. The ECDIS has got a good evaluation. The extension function version has been delivered to the customer to acceptance.