Alabama
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EDAA
GTAC

Alaska
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ACCU
ANC1
CMJV
UAAG

Arkansas
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ARK1
LROC
CSAL

California
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SSCC
CMOD
PLSB
SHJB
TMSB

Colorado
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MC01

Connecticut
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RVDI

Illinois
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DP1A
DP2A
KAR1
RRW1
VODG

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.

We would like to welcome the newest member of Cooperative CORS.
City of San Marcos, Texas
CSM1
http://www.ci.san-marcos.tx.us/departments/engineering/ngcs.htm

New Hampshire
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NHDT

New York
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NYEC
SMTS

Ohio
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Stark County

Oregon
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BTON
LPSB
MCSO
OBEC
STAY
WACO
WDBN