. . "SDN:L05::POS12" . . . . "{\"node\": {\n \"mode\": \"hyperbolic or circular\",\n \"notes\": \"Navigation and positioning system for the North Sea petroleum industry.\",\n \"range\": \"400km hyperbolic; 75-100km circular\",\n \"accuracy\": \"better than 2m below horizon (10m above horizon)\",\n \"operational\": \"1980s to 1995\",\n \"frequency\": \"420-450MHz\"\n}}"@en . "Système leger de measure de distance receivers"@en . "Syledis" . "Syledis"@en . "accepted"@en . . . . . . . . . . . . .