The Viewpoint “WAAS: Vital for NextGen and It Needs Help” (AW&ST June 10, p. 58) describes the Wide Area Augmentation System (WAAS) as being in need of expansion to help NextGen. I believe Ernest Edwards's terminology is a little misplaced. WAAS is a Space-Based Augmentation System (SBAS) to GPS which already covers North America and cannot be expanded there. What can be expanded is the charting of Required Area Navigation (RNAV) instrument approaches to Localizer Precision ...


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