Blog Editor’s Note: The National Space-based Positioning, Navigation, and Timing (PNT) Advisory Board is a Federal Advisory Committee Act body established by Presidential directive and administered by NASA. It reports to the US government’s PNT Executive Committee which is co-chaired by the deputy secretaries of the Department of Defense and Department of Transportation.

This letter about Ligado’s applications before the FCC follows a July 2017 letter on the same topic.  Both letters strongly oppose Ligado’s application.


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Letter of August 10th, 2018: PNT Advisory Board (PNTAB) Recommendation to PNT Executive Committee (EXCOM) Regarding Latest Ligado Proposal

Letter of July 5th, 2017: Adjacent Band Harmful Interference to Global Positioning System (GPS) Users