Welcome!

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The CSRN is Colorado's premier clearinghouse for information about real time Global Navigation Satellite System (GNSS) Reference Networks located throughout the state.

This site is provided and maintained by the Professional Land Surveyors of Colorado, Inc., a non-profit organization of professional surveyors and mappers dedicated to the improvement of land surveying education and practice.

Real time reference networks serve a variety of users by providing rapid, reliable, real time GNSS corrections to surveyors, mappers and emergency responders.

Our goal is to provide you with quick access to information about the nearest reference network in your geographical area to meet your positional needs.

For comments or suggestions please see our Suggestion Form by clicking the Contact Us tab above.