SAN FRANCISCO — A recent proposal by LightSquared to modify its plans to deploy a U.S. broadband network in a way that would decrease its interference with GPS receivers has done little to allay concerns raised by representatives of federal agencies that rely on precise GPS signals for transportation, communications, weather forecasting, disaster response and scientific research.

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Debra Werner is a correspondent for SpaceNews based in San Francisco. Debra earned a bachelor’s degree in communications from the University of California, Berkeley, and a master’s degree in Journalism from Northwestern University. She is a recipient...