Spectra Precision FAST Survey Using a background map in FAST Survey - Manual (Page 6)

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x0 coordinate (xxxxxx)
y0 coordinate (xxxxxx)
After saving the ASCII text file to the same folder as the
original image file, you can come back to the procedure
described in Preparing a Map File for Use as a Background
Map in FAST Survey on page 1 to georeference your map and
generate the corresponding BMP map sections used by FAST
Survey.