Glasgow, 1st.ed., 1995. Xxv + 259 pp., 59 photo-ills. Pict. laminated boards, 30 x 22cm. V.G.+. Radio was introduced into the maritime world during the 1890s and has since been responsible for saving thousands of lives at sea. The author records the development of marine radio from the spark transmitter and coherer receiver to the coming of valves, radiotelephony, solid state technology, radiotelex and satellite communication. Ship stations require shore stations and British facilities are outlined. Radio technology provided a means of establishing a ship's position. World War I saw the introduction of the Radio Direction Finder. Radar was first installed aboard ship during the Second World War, together with Hyperbolic Positioning Systems. Recent Satellite Navigation Systems have virtually made the sextant redundant. The author also describes the lives of 'Sparks' at sea ; an essential member of any crew. He includes accounts of services rendered in peace and war, examples of Radio Officer's devotion to duty and courage, remaining at his post sending out distress calls as his ship sinks beneath him. Illustrated with 59 photographs, this book is one of the best on the subject. SCARCE.