Spectra Precision Survey Pro 3.80 Recon GPS Reference Manual - Manual (Page 63)

Survey Menu – RTK
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elevation coordinate. When the horizontal projection is not solved,
and the dialog is used only to occupy a vertical control point, the
$FFHSW button simply closes the dialog.
2FFXS\ %HQFKPDUN : opens the Occupy Control Point screen (Page R-
35) where the measurement is taken by the rover on the remote
benchmark. The
New Elevation field of the Remote Elevation screen
will then display the new elevation for the base point.