The existing air navigation services have many shortcomings and a reform was necessary. The new systems (CNS/ATM systems) will be largely dependent on Global Navigation Satellite Systems (GNSS) which can bring significant benefits to air navigation in terms of safety, efficiency, capacity, and economy. However, GNSS have weaknesses which can be reduced but will never be fully eliminated. Depending solely on a system that can be disrupted is not acceptable for safety of life applications, such as aviation. The implementation of GNSS also raises unique legal issues and ICAO has been working on the establishment of a legal framework for GNSS since 1992. Nevertheless, disagreement between states on the need for an international convention remains significant. Legal discussions should not slow down the implementation of GNSS which, when used in conjunction with terrestrial navigation aids, have the potential to revolutionize air navigation.

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The Global Navigation Satellite System (GNSS) is the main element of the CNS/ATM system elaborated by the International Civil Aviation Organization (ICAO). / The US GPS and Russian GLONASS are the two existing systems. Both of them were created by the military. / Europe is currently developing a civil navigation satellite system: Galileo. / This thesis will present some legal issues of the GNSS discussed in the framework of ICAO: sovereignty of States, universal accessibility, continuity and quality of the service, cost recovery and financing, certification and liability. / It will also present some legal issues due to the creation of the European Galileo program. The financing, organizational framework, certification and liability will be examined. Finally, ICAO's Charter on the Rights and Obligations of States Relating to GNSS Services will be considered.

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Signalling the beginning of a new era to international civil aviation, the concept of the CNS/ATM systems came into being as the result of joint efforts of the international community, under the aegis of ICAO, in search for a solution to the limitations of the ground-based air navigation systems, which would otherwise inhibit further development of air transport on a global scale. Employing digital and satellite technologies in support of a seamless air traffic management system, it will bring improvements upon the present levels of safety, efficiency and accuracy, as well as increased capacity and economic benefits. / An analysis of the existing legal tools hereby confirms the need for the development of an appropriate legal framework for the GNSS. In considering the fundamental principles to be contained therein, this thesis examines the adequacy of an international convention as the long-term means to provide for the legal guarantees which will inspire world-wide confidence in the integrity of the system. Finally, it provides detailed examination of the relevant legal issues, such as liability, certification, administration, financing and cost recovery, as well as future operating structures. (Abstract shortened by UMI.)

Typescript. / Thesis (Ph. D.)--University of Hawaii, 1967. / Bibliography: leaves [91]-103. / ix, 103 l illus., maps, tables