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The Pathfinder Office from Trimble software comes with a tool called
QuickPlan to assess satellite availability and PDOP, GDOP, etc. In
Sutton Lab, use either the "Tholos" or "Bramante" computer, and go to
Start-Programs-Pathfinder Office-QuickPlan. (Note: if it says that
the almanac data is more than 30 days out of date, you can download "current
ephemeris data" from the Trimble GPS Data Resources site below. Download
the file to C:\Program Files\Common Files\Trimble\Almanacs\
Note: whenever you use the GPS receiver to collect data, it also record current
ephemeris data which can be transferred back to Patherfinder Office.
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Trimble's GPS Data
Resources Site
(includes downloads for satellite schedules and current ephemeris data)
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Interactive GPS Satellite
Prediction Utility
(from the US Naval
Observatory's Time Service Department)
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