U.S. shut down 19 of 24 land - based GPS - C navigation stations on Monday . GPS says Loran no longer works in place of Global Navigation System . Killing Loran-C will save the government $ 190 million over five years , Obama said . They warn it is vulnerable to counter - attacks , suggest keeping Loran as backup .
U.S. shut down 19 of 24 land - based GPS - C navigation stations on Monday . GPS says Loran no longer works in place of Global Navigation System . They warn it is vulnerable to counter - attacks , suggest keeping Loran as backup .