CIRCULAR AUTOMATIC DEPENDENT SURVEILLANCE Approved by fhe Secretary General and published under his authority INTERNATIONAL ClVIL AVlATlOEE ORGANlZATION MONTREAL CANADA
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The ICAO Council's Special Committee on Future Air Navigation Systems FANS, in accordance with its terms of reference, carried out extensive studies aimed at identifying and assessing new concepts and new technology, including satellite technology, which may have future benefits for the development of irlternational civil aviation. Automatic dependent surveillance ADS was defined by the FANS Committee as a function for use by air traffic services whereby aircraft automatically transmit, via data link, data derived from on-board navigation systems, including aircraft identification and three-dimensional position, This circular has been prepared by the ICAO Secretariat with the assistance of an air navigation ADS Study Group comprising experts from ten Cantracting States and five international organizations, El contains guidance material on ADS including information concerning the experience gained to date regarding development and planning of ADS, pre-implementation programmes and harmonization of air traffic services. The purpose of the circular is to provide information on a number of aspects of ADS that, would benefit and harmonize its early world-wide implementation. The introduction and operation of ADS will provide air traffic service units with the capability to extend automatic surveillance of aircraft beyond present radar coverage and to monitor air traffic operations over oceanic and land areas where procedural air traffic control is presently applied. It is envisaged that the implementation of ADS will have considerable impact on air traffic control procedures and that the guidance material presented herein wiI1 need to be supplemented ia the light of experience. It is therefore recommended that States share with ICAO their experience concerning ADS with the objective of updating the guidance material contained in this circular.
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