ABSTRACT
The Global Navigation Satellite System (GNSS) is essentially a system of satellite technology which, when applied to aviation, determines the position, velocity and components of an aircraft in flight. GNSS has its origin in the ground-breaking ICAO mechanism devised some 10 years ago, called the Future Air Navigation System (FANS) which paved the way for the now ultra-modern air navigation management system called Communications, Navigation, Surveillance/Air Traffic Management (CNS/ATM). GNSS has been aptly described as the most exciting technological shopping trip of the 20th century that will provide many safety and efficiency specials for both the developed and the developing world.1 Safety and efficiency features promised by GNSS include advanced screening of mountainous regions in countries such as Japan, New Zealand and Nepal (which are currently finding it difficult with available radar screening technology) and visual surveillance of vast desert areas of the Middle East and countries such as Australia and the United States.2
