WAAS Constrained

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...

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