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GPS PROS Group Forum is for any member of LSU that is a professional land surveyor using primarily GPS in the field. Geodetic / Global Positioning Systems (GPS) Get help and offer support with survey grade GPS!

USCG Nav Center Issues High Horizontal Dilution of Precision AdvisorySeptember 9, 2009--------------------------------------------------------------------------------GPS may be unreliable in certain parts of the world for short periods on September 11 as a result of a routine Delta-V maneuver with satellite #52 (PRN-31).The Navigation Information Service of the U.S. Coast Guard Navigation Center issued a High Horizontal Dilution of Precision (HDOP) Advisory, reporting that GPS users may experience a temporary degradation in GPS reception in parts of the southwest and central United States from 13:02 UTC to 13:23 UTC on September 11.The following areas in the United States may be affected:Southern NebraskaKansasOklahomaSouthwestern ArkansasEastern TexasWestern Louisiana

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