Alabama
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ALAU
GTAC
Earl Dudley

Alaska
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ANC1
UAAG

Arkansas
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ARK1
CTA1
CSAL
EFAY
WWED

California
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CMOD
HSIB
LEIC
PLSB
SACR
SEIB
TMSB

Colorado
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Mesa County

Connecticut
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NRME
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Georgia
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COSG
Cobb County

Illinois
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RRW1
SIFH
TWMW
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DuPage County
Kara Company

Daily Plots

Check details for new site Guidelines.

Check on the Status of all Coop CORS Sites
and the Daily Report on missing data

Cooperative CORS members must fill out a proper station log... see Notices ( scroll to bottom )

The Cooperative CORS (continuously operating reference station) system provides access to GPS data that are disseminated by organizations other than the National Geodetic Survey (NGS).   This web page contains links to the web sites of cooperating organizations where users can download pertinent GPS data, positional coordinates, and related information.  NGS computes these positional coordinates to ensure their consistency with the National Spatial Reference System (NSRS).

Cooperative CORS and OPUS team up!
OPUS users may now select qualifying Cooperative CORS to process RINEX data.  This upgrade will provide users access to more and possibly closer quality base stations.

Please contact the cooperating organization if you encounter difficulties in accessing information from their web site.

You can access the Cooperative CORS site directly by clicking on the site ID on the sides.

If a broken link is encountered please let us know.