Spectra Precision ProMark Field Software - Manual (Page 62)

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Through the above URL, you can also install the Extract Tool
on your computer (see bottom of the menu on the left).
Use this tool to limit the geographical extent of the selected
geoid to your working area. This may be useful to reduce the
space occupied by the geoid file on your receiver.
The extracted geoid (also a *.geo file) should then be copied
to My Device \Program Files\Geoids Data\ on the receiver.