Covering the complete Association of Marine Electric and Radio Colleges (AMERC) syllabus for Electrotechnology Officers (ETOs), the book is divided into three sections: Basic Electronics; Navigational Aids (theory and fault finding); and Radio Communications (including GMDSS). The first textbook aimed primarily at Electro-technical Officers (covering the changes to the STCW 2010), volume 15 of the Reeds Marine Engineering Series includes technical diagrams, worked examples and self-study questions to help in student understanding. This second edition has been updated throughout, and expanded with new questions and answers. It is an essential book for all students undertaking an ETO course.