High Quality Content by WIKIPEDIA articles! In the last few months before the year 2000, two other date-related milestones occurred that received less publicity than the then-impending Y2K problem. The first problem was related to GPS devices: GPS dates are expressed as a week number and a day-of-week number, with the week number transmitted as a ten-bit value. This means that every 1,024 weeks after January 6, 1980 (the GPS epoch), the date resets again to that date; this happened for the first time on August 21, 1999. To address this concern, modernized GPS navigation messages use a 13-bit field, which only repeats every 8,192 weeks , and will not return to zero until near the year 2137.

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