The 6th of April 2019 – some GPS modules might stop working after that date05:42

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Do you know that after the 6th of April 2019 some of GPS modules might stop working? Yeap… GPS is switching epochs again and on that day week number will go from 1023 to 0. How GPS receivers will react? Nobody really knows. Rather new should be fine but old ones or clones from China with extremely old firmware might just go crazy.

It’s because of how the GPS system encodes UTC time. The week number is stored with 10 bit, and that means there can be only 1024 weeks in one GPS epoch. In April, we will go from week 1023 to week 0. How cheap cloned GPSes will react to that fact? Nobody really knows.

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