Astro-navigation from Square One to Ocean-master is an impressively dynamic and understandable book. It is clear and concise with a large number of excellent diagrams that admirably compliment the text, demystifying and simplifying the art of astro-navigation. The excellent glossary of terms and language used, together with the highlighting of important points make this book particularly applicable to teachers, students and those new to the subject. Captain James P. Hughes. Lecturer in Nautical Science, South Tyneside College | Astro-navigation From Square One To Ocean-master by Alan Murray, Paperback | Indigo Chapters