California Real Time Network (CRTN) Registration

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Please take a few minutes to complete the registration form and to find out more about CRTN. Your information is important to us, is confidential, and will be used for internal purposes only. Information about CRTN users helps us to gather support for CRTN through collaborations and requests for funding through grants. However, direct funding to operate and maintain CRTN is provided by users like you through donations and payment for CRTN data services.
Each organization has free access to a single NTRIP account for real-time access to RTCM 3.0 data. A donation or CRTN data service payment of $1,000 annually gives you a CRTN Contributing Membership and provides access to an additional account. Please also see the CRTN Data Policy PDF file at or click here
CRTN is a multipurpose statewide real-time network that utilizes the existing geophysical GPS infrastructure in California and provides the backbone for the geodetic control network that is outlined in the California Spatial Reference Center (CSRC) Master Plan. It provides accurate and reliable real-time positioning services that are consistent and on a common reference system, the California Spatial Reference System (CSRS), which fulfills the requirements of the California Public Resources Codes for GPS-derived geodetic coordinates and orthometric heights. CRTN offers free open access to RTCM data streams for single-base RTK positioning with respect to the CSRS and multiple real-time data streams are available to CRTN Contributing and Consortium Members.

As background, the CSRC Executive Committee and the CRTN Consortium Members, who are primarily CSRC/CRTN users and part of the surveying community, provides CRTN oversight. University of California, San Diego (UCSD) provides funding and business/administrative oversight. Our staff is part of the Scripps Orbit and Permanent Array Center (SOPAC; at the Scripps Institution of Oceanography at UCSD and we conduct research in the areas of high-precision GPS, rapid response systems for earthquakes and tsunamis, GPS meteorology, and seismogeodesy.

Thank you for your support and for using CRTN.