>From the USN obs.
http://192.5.41.239/gps_week.html
excerpt:
The GPS Week Number count began at approximately midnight on the evening of
05 January 1980 / morning of 06 January 1980. Since that time,
the count has been incremented by 1 each week, and broadcast as part of the
GPS message. The GPS Week Number field is modulo 1024. This
means that at the completeion of week 1023, the GPS week number will
rollover to 0 on midnight of the evening of 21 August 1999 / morning
of 22 August 1999.
Once the rollover has occured, it is the responsibility of the user (i.e.,
user equipment or software) to account for the previous 1024 weeks.
Depending upon the manufacturer of your GPS receiver, you may or may
not be affected by the GPS Week Number Rollover on 22 August
1999. Some receivers may display inaccurate date information, some
may also calculate incorrect navigation solutions.
Contact the manufacturer of your GPS receiver to determine if you
will be affected by the GPS week number rollover. Contacts for some
GPS receiver manufacturers can be found here or here. <links on
original page> <more links on the page too>
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