Hi fellow surveyors. I have a Carlson BRx5 GNNS L1/L2 gps rover which I normally use in areas with NTRIP base stations. I would like to know if there is a way of getting the BRx5 to communicate with my old Trimble 4000SSE base using the CMR+ data format. The normal format for data is RTCM3.1 but the Trimble 4000 can only output RTCM2. It is capable of transmitting CMR+ though. If it is at all possible to match the two, does CMR+ influence the accuracy of the fix.

Simon Griffith

This Content Originally Published by a land surveyor to Land Surveyors United Network

Views: 165

See Your Saved Posts Timeline

☇ Reply to this

Replies to This Discussion

Dear Mr. Griffith,

The CMR is a proprietary format created by Trimble. The structure was made public and so other manufacturers were able to utilize it. CMR+ has further enhancements for GLONASS &c. and will often cause problems when a rover of another manufacturer receives it.

That said, if I remember correctly, the SSE was a GPS only receiver, in which case there is no benefit to using CMR+. I would try RTCM because it should have the highest probability of success.

Good luck.


Thank you for your reply Anthony, every bit of information helps. I will persevere with RTCM.




Where Thousands of Professional Land Surveyors, Students of Surveying and Educators are United through Collaborative Knowledge and Purpose.

Tools,Apps and Quick Guides


Social Support For Equipment

Surveyor Birthdays

Work Truck Music


© 2018   © Created by Land Surveyors United   Powered by

Badges  |  Contact LSU  |  Privacy Policy  |  Terms of Service