DOT to Congress: 'We are working to implement a terrestrial timing system'
from Inside GNSS
From May 16:
In a response to an inquiry by House Transportation and Infrastructure Chairman Peter DeFazio, the U.S. Department of Transportation provided an outline of its process to implement a terrestrial timing system to complement and backup GPS signals. In early March, DeFazio and three other members of Congress sent a letter to Transportation Secretary Chao asking about progress on a GPS Backup Technology Demonstration first mandated by law in December 2017.
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