Accuracy issues

Hi, I have a reach rx (rover) taking correction from a rs2+ (base) bia LTE, set on a known precise point. The issue I’m having is that sometimes when I go to stake out a control point nearby or any point, it will be off about 2 inches horizontally. sometimes it will be on point and sometimes it will be off. how can I correct this?


Hi @ajexgood,

RX provides cm-level accuracy. It can be higher or lower depending on various factors such as conditions and baseline. Please make sure that there are no obstructions near your survey site and that your baseline is within 60km.

If you get different coordinates when staking out in the same setup and location, please send us the known coordinates and a file with 2 collected positions from Flow so that we can investigate the difference. You can send this to

Were the base coordinates the same in different tests? The accuracy of the rover depends on the accuracy of the base position.

Please check if you’re using the latest version of the Emlid Flow and the latest Reach firmware.

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Hi, what type of file do you need from Flow? Is a project file all right?

Yes, you can export your project with mismatching coordinates in CSV format and send it to