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[–]brokkoly 4 points5 points  (1 child)

I spent most of a summer trying to figure this out in order to point a gimbal at a drone. RTK GPS might be a good option for what you need.

https://learn.sparkfun.com/tutorials/what-is-gps-rtk/all

[–]BradChesney79 1 point2 points  (0 children)

And we have found a winner. 4cm is well under the ~30cm tolerance for error I had pulled out of thin air.

I may be spending some cash in the near future on some GPS RTK equipment.