Abstract
The Wide Area Augmentation Systems (WAAS) are being designed and built to provide the required accuracy, availability, integrity and continuity of service to users to so as to reach the satisfaction to rely on global positioning systems as NAVSTAR GPS as the sole means of navigation for all phases of flight in aviation and other maritime as well as land navigation and surveying use. In this paper, a WAAS covering the Arab region from Morocco (west) to Kuwait (east) is proposed; hence dubbed the (ARWAAS). The ARWAAS concept and architecture as well as the layout and interoperability issues are considered.