Spectra Precision FAST Survey Reference Manual - Manual (Page 91)

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When OK is pressed, you will be asked to load the associated “.dat” file, in a dialog similar to below:
 Read From File
- Reads a previously saved base position file. All of the other methods of setting up the base let
you save the base position at the end of setup. If you return to a site, set up the base in exactly the same position,
use Read From File to use the same base position and you don’t have to re-align the rover: the old alignment is still
valid.
This option recalls a reference file in a dialog similar to that above. Then you will receive the standard prompting.
This is followed by the Reference Station ID prompt (showing the default ID). The “new” base antenna height,