GPS INFORMATION/HELP

Time Conversions (Select the month, day, year, and enter the time of day in UTC.)

Month	Day	Year	UTC (h:m:s)
			::

Information Links

GPS Glossary
A Glossary of GPS Terms
Data	Ephemerides
CORS Data OPUS processing DOP predictor program WSEM36 current almanac data to support program RINEX2 file formats Antenna calibration data NGS control data sheets Calendar NGA Calendar SP3 File Format	Broadcast WGS 84 Ultra-Rapid Rapid NGS IGS Precise WGS 84 Coast Guard NGA IGS Orbit accuracies
Almanacs (GPS+GNSS Simulation)	Satellite Status
YUMA archives SEM archives GLONASS Almanacs	Messages archives Notice Advisories to NAVSTAR Users (NANU) archives Condition of GLONASS satellites GPS Satellite Skyplot Software Satellite health codes Current status Launch schedules and delays
Geoid Models/Earth Orientation/Data	Solar and Geomagnetic Activity
Geoid 99 G99SSS - Scientific model Earth Orientation Parameter Prediction Transformation parameters from Local Datum to WGS84 - NGA Horizontal Time Dependent Positioning - NGS	Solar forecast Good Canadian site Geomagnetic k-indices Space weather alerts Brief description SEC Navigation System page (provides 30 outlook at kp index) Space weather scales Space weather now Geomagnetic Activity k-index plot (Beware of periods in yellow and avoid periods in red) Ionospheric plot Daily Ionospheric maps DX Solar activity report
Differential GPS	Organizations
U.S. Coast Guard Navigation Center	National Geodetic Survey The GPS Toolbox U.S. Coast Guard U.S. Naval Observatory Time clocks National Geospatial-information Agency (NGA)
Other related links
GPS performance statistics Library of technical papers Overview of GPS M code NGA metadata site LAAS/WAAS links (Stanford University GPS group) Richard Langley GPS links Satellite and Navigation Positioning Group	Clock accuracies International GPS Service site ESA Near-Earth Navigation and Geodesy Australian space forecast center Links to Community-based stations NORAD web site and related links National Imagery and Mapping Agency (NIMA)