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From: Ted Faber <faber@ISI.EDU>
Rick Schiffman mentioined this at bagels this morning:
Another important event for GPS receivers will occur on August 22,
1999. This event, known as GPS week number rollover, is when the week
number transmitted in the satellite navigation message will change
from 1023 to 0.
http://www.garmin.com/faqs/19.html has more about it.