Advice: use extreme caution on April 6th, 2019. Each 19.7 year period is known in GPS terms as an epoch. On the 6th a new epoch will arrive the last epoch was in 1999. GPS receivers are part of a critical timing systems. The impact is unpredictable. https://ics-cert.us-cert.gov/sites/default/files/documents/Memorandum_on_GPS_2019.pdf …
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