![Figure 6-1 Nationwide Differential GPS Coverage as of November 2000 | Bureau of Transportation Statistics Figure 6-1 Nationwide Differential GPS Coverage as of November 2000 | Bureau of Transportation Statistics](https://www.bts.gov/sites/bts.dot.gov/files/legacy/publications/the_changing_face_of_transportation/images/figure_06_01.gif)
Figure 6-1 Nationwide Differential GPS Coverage as of November 2000 | Bureau of Transportation Statistics
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![NDGPS Coverage and Wide Area Augmentation System (WAAS) | GEOG 862: GPS and GNSS for Geospatial Professionals NDGPS Coverage and Wide Area Augmentation System (WAAS) | GEOG 862: GPS and GNSS for Geospatial Professionals](https://www.e-education.psu.edu/geog862/sites/www.e-education.psu.edu.geog862/files/images/Lesson07/MaritimeDGPS_map.jpg)