Federal officials in the United States held a meeting on 3 September 2015 to discuss the option of using enhanced Long Range Navigation (eLoran) as a secure and complementary system for GPS. For many years, the US federal government has recognised that the lack of a reliable backup system for GPS represents an economic and security threat, and it has repeatedly reaffirmed its interest in developing eLoran as a reliable, land-based solution. A bipartisan bill (the National Positioning, Navigation, and Timing Resilience and Security Act of 2015), introduced in March 2015, calls for the Secretary of Defense to establish a backup for GPS within three years using eLoran.
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