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Users of GPS are being advised about the GPS Week Number rollover which will occur on April 6, 2019. According to the U.S. Air Force, which is responsible for the Global Positioning System, “The GPS Week Number count began at approximately midnight on the evening of Jan. 5, 1980/morning of Jan. 6, 1980. Since that time, the count has been incremented by 1 each week and is broadcast as part of the GPS message. One of the GPS week number fields in the legacy navigation message counts from zero to 1023 weeks. At the completion of every 1024 GPS weeks the field rolls from 1023 to zero and starts counting again. The first occurrence was on the evening of Aug. 21, 1999 and the message field rolled to zero at midnight GPS Time. The next similar GPS Week Number rollover occurs on April 6, 2019.”
“We appreciate the 4 billion people around the world who use GPS signals on a daily basis, which is why we are transparent in providing detailed guidance on use for compatibility,” said Lt. Col. Stephen Toth, 2nd Space Operations Squadron commander.