Field Test Confirms WAAS Provides Sub-Meter Accuracy.

Assesses the sub-meter accuracy of the Wide-Area Augmentation System (WAAS) as a source of free Global Positioning System differential correction data, developed by the U.S. Federal Aviation Administration. Background on the WAAS; Results of the tests on the consistency and accuracy of the system; Benefits of the system to users; Factor to consider in trying WAAS or any other service.