I remember something like this from 2011: https://web.archive.org/web/20111015232120/http://navcen.uscg.gov/pdf/lnms/lnm07032011.pdf#page=4 https://web.archive.

I remember something like this from 2011: https://web.archive.org/web/20111015232120/http://navcen.uscg.gov/pdf/lnms/lnm07032011.pdf#page=4 https://web.archive.org/web/20111015232120/http://navcen.usc... “SOUTHEAST ATLANTIC COAST: GPS Testing Information THE GPS NAVIGATION SIGNALS MAY BE UNRELIABLE FROM 20 JAN 2011 - 22 FEB 2011 FROM 0000Z - 0245Z DUE TO TESTING ON GPS FREQUENCIES USED IN SHIPBOARD NAVIGATION AND HANDHELD SYSTEMS. GPS SYSTEMS THAT RELY ON GPS, SUCH AS E-911, AIS AND DSC, MAY BE AFFECTED WITHIN A 150 NM RADIUS OF POSITION 30 49.09N 80 28.18W. DURING THIS PERIOD GPS USERS ARE ENCOURAGED TO REPORT ANY GPS SERVICE OUTAGES THAT THEY MAY EXPERIENCE DURING THIS TESTING VIA THE NAVIGATION INFORMATION SERVICE (NIS) BY CALLING (703) 313-5900 OR BY USING THE NAVCEN WEB SITE'S GPS REPORT A PROBLEM WORKSHEET AT WWW.NAVCEN.USCG.GOV.” I specifically remember it because I was trying to navigate my roommate and I to the Atlanta IKEA but my phone showed me as being, like, south of Macon. ~100mi of error.