Spectra Precision Survey Pro v4.5 Recon and Nomad Reference Manual - Manual (Page 125)

Survey Menu
R-117
By Angle : When the backsight is defined by a direction, this routine
will read the current horizontal angle from the total station and
compare that to the backsight direction.
Check Backsight
Survey Backsight Setup Check… .
The Check Backsight screen is used to help confirm that the total
station is facing toward the correct backsight by comparing the
known distance or horizontal angle to the backsight with the
measured value. This routine can also be performed from the
Backsight Solved screen.
By Distance : will take a shot to a prism located over the
backsight point and compare the measured distance with
the computed distance between the occupy and backsight
points stored in the current job.
Note: The Check by Distance method does not apply if
the backsight is defined by a direction.
By Angle : When the backsight is defined by a direction,
this routine will read the current horizontal angle from
the total station and compare that to the backsight
direction.
Circle… : accesses the Backsight Circle dialog box,
described below.