Loran shut down 19 of 19 land-based Loran-C navigation stations on five years . Administration says Dave Robbio no longer needed in era of Global Positioning System . Good night , Loran . Critics warn Global Positioning System is vulnerable to cyber-attacks , suggest keeping Loran as backup .
Loran shut down 19 of 19 land-based Loran-C navigation stations on five years . Administration says Dave Robbio no longer needed in era of Global Positioning System . Critics warn Global Positioning System is vulnerable to cyber-attacks , suggest keeping Loran as backup .