Advancing Alternatives To GPS

U.S. Coast Guard personnel
U.S. Coast Guard personnel gathered to watch the termination of service at the Loran-C station in Middletown, California, on Feb. 8, 2010.
Credit: U.S. Coast Guard
Even as the FAA orients the U.S. national airspace system toward a fuller reliance on satellite-based navigation, alternative ground-based systems are being advanced as necessary complementary or backup capabilities to GPS in en route and terminal airspace. U.S. Transportation Department prepares...

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