> But my John Deere hardware has GPS support for crops and the accuracy is pretty damn spot on.
To get that level of accuracy they're using differential GPS where another fairly expensive device is placed at a known location and transmits a signal indicating the amount and direction of the error in the signal received from the satellites. The receiver on the tractor then uses this information to correct the signal and get much greater accuracy than would otherwise be available.
This is not available in consumer-grade receivers.
>This is not available in consumer-grade receivers.
not true. i posted a link in a sibling comment but you can use two piksis with one as the base and one as the rover to get sub cm differential rtk. you can also use NOAA CORS station (if you're within 10km) to get precise ppk
for this use case i would set the base down at a fixed location and let it solve. then i would wait a day for CORS data to get accurate gps for the base and plan out my trajectories relative to that base (using whatever registered maps they use). alternatively you could survey the location where the base sits.
To get that level of accuracy they're using differential GPS where another fairly expensive device is placed at a known location and transmits a signal indicating the amount and direction of the error in the signal received from the satellites. The receiver on the tractor then uses this information to correct the signal and get much greater accuracy than would otherwise be available.
This is not available in consumer-grade receivers.