Propeller AEROPOINTS User Manual page 17

Local Site Calibration:
If your site has its own local calibration, we can correct
your AeroPoints to positions in your local site coordinates.
You'll just need to upload a local site calibration file
(e.g., a Trimble .CAL) or send us or a point pair file
(i.e. a list of points in both global and local coordinates).
If you're interested in using this correction method,
talk to us: support@propelleraero.com.
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AeroPoints User Manual