U.S. lawmakers and industry experts are critical of President Obama's plan to shut down a decades-old navigation system that could serve as a backup to the Global Positioning System (GPS), the backbone of the Federal Aviation Administration's Next Generation Air Transportation System (NextGen). The U.S. government provides GPS service free of charge and plans to invest more than $5.8 billion over the next five years in the GPS satellites and ground control segments. A modernization effort includes GPS IIF and…
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