This book elaborates on the significance of the development of marine unmanned equipment as well as the history and current status of the development at home and abroad and analyzes the technical characteristics of marine unmanned equipment from the dimensional fields of overview, basic principles, key technologies, and applications in marine engineering, taking unmanned aircraft and unmanned boat equipment platforms as examples. The four necessary technologies to achieve the intelligent development of maritime unmanned equipment are introduced in detail: sonar technology, optoelectronic technology, radar technology, maritime communication technology, and so on. The book explains the relevant professional knowledge in the form of examples, keeps a close eye on the practical application, makes the professional knowledge more professional and readable, and is oriented to the practitioners of marine equipment as well as the public's study book.