. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "Differential Global Positioning System receivers"@en . . . . . . . . . . . . . . "{\"node\": {\n \"notes\": \"GPS augmented by a network of fixed ground stations that continuously broadcast the difference between their true locations and the location determined from the satellites.\",\n \"accuracy\": \"better than 100m to better than 10m\"\n}}"@en . . . . . . . . . . . . . . . . . . . . . . . . "DGPS" . "DGPS"@en . . . "accepted"@en . . . "SDN:L05::POS04" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .