Divided into three sections, the book covers the complete syllabus for Electrotechnology Officers as specified by the Association of Marine Electronic & Radio Colleges (AMERC), with a series of worked examples & self-study questions to assist in student understanding. The book introduces basic electronics, the theory of how a range of navigational aids works, & radio communications including GMDSS. Fault finding to component & sub system level is also included. Importantly, this is the first textbook to be aimed primarily at ETOs, covering the changes to the STCW 2010. An essential buy.