Comment on Increasing Local GPS Accuracy for a Small Robot by Observer

How about this?

Set up a fixed GPS receiver on the property. Log GPS data over days or weeks, average all the data, and call the resulting, composite, value your "reference" location value. After that, take every GPS live reading and subtract the reference value, to generate a stream of error-correction values.

Next, set up a radio link (Meshtastic?) and transmit the time-stamped error correction stream to the robot. Every time the robot makes a GPS measurement, subtract the received error correction value.

It would be interesting to see to what extent the robot's positional accuracy improves.