Sponsored by the U.S. Coast Guard Navigation Information Service, this site offers GPS constellation status, scheduled outage updates, user advisories, and almanac data, as well as differential GPS, Loran-C, and Coast Guard Local Notice to Mariners information. WWV minutes 14 and 15 and WWVH minutes 43 and 44, high frequency. This University of New Brunswick service presents daily GPS constellation status reports as well as news and discussion about GPS and other space-based positioning systems by way of electronic mail.
Downloadable files are also available.
CACS is operated in collaboration with the Geological Survey of Canada and is linked to the International GPS Service. Information about data availability is accessible on line. All information dates back to 1992 and is available 24 hours a day. Precise GPS Orbit Information Precise orbit information based on tracking data collected from stations of the International GPS Service are included on this site. Each data set provides one week of ephemeris information at 40-minute intervals, distributed on diskette.