In a message dated 6/3/00 7:08:53 AM EDT, john@mlh.com writes: > > BTW - the GPS that I am using is consistently 1 second behind WWV. Go > > figure. > > GPS does not do "leap-seconds" so it is not synchronized with UTC, which > inserts leap-seconds every so often. From: http://tycho.usno.navy.mil/gpstt.html ------------------------------------------------- GPS TIME INFORMATION GPS time is given by its Composite Clock (CC). The CC or "paper" clock consists of all Monitor Station and satellite operational frequency standards. The system was previously referenced to one of the Monitor Station's operational frequency standards and switched from one station to another as needed. The GPS epoch is 0000 UT (midnight) on January 6, 1980. GPS time is not adjusted and therefore is offset from UTC by an integer number of seconds, due to the insertion of leap seconds. The number remains constant until the next leap second occurs. This offset is also given in the navigation (NAV) message and your receiver should apply the correction automatically. As of January 1, 1999, GPS time is ahead of UTC by thirteen (13) seconds. -------------------------------------------------- Cheers Don Gardner 39.1799 N, 76.8406 W, 100m ASL Homepage: http://hometown.aol.com/mir16609/ ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
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