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Comment Re:Surveyors are going to start having problems... (Score 4, Informative) 210

by ll1234 on Friday May 15, 2009 @12:17AM (#27961569) Attached to: GPS Accuracy Could Start Dropping In 2010

The DGPS system at Libby Dam in Montana is accurate to 1-mm vertically:

Performance Monitoring Of Libby Dam With A Differential Global Positioning System UNITED STATES SOCIETY OF DAMS (JUNE 2005)

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The system was down for backups from 5am to 10am last Saturday.