1] This book is a much needed avionics reference book and text. It is an excellent overview of emerging and traditional avionics systems. The book starts with a short history of avionics development and then goes on to explain all avionics systems found in modern aircraft. Dr. Helfrick does an excellent job of explaining how various systems function and their role in the aircraft and air traffic control system. The book is written with the avionics technician or engineer in mind but would be very helpful to pilots who want a more in depth knowledge of the systems in the aircraft they fly. The book addresses future as well as all current systems and is a must for anyone interested or working in the field of avionics.
John Brannon, Daytona Beach, FL

2] This book offers a clear and concise explanation of the modern avionics suite. The best part of all is that one does not really need a background to understand the material that is presented. The book does an outstanding job of cultivating the necessary basics and then builds on it. This text can either be read cover to cover, or as a reference and reviewed as needed. I would definitely recommend this book to anyone who is interested in this subject.
Thomas McCormack, Stratford, CT