Spectra Precision Survey Pro v4.5 Ranger User Manual - Manual (Page 65)

Conventional Fieldwork
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Note: If the Backsight Circle displays a non-zero value, the angle
displayed is subtracted from all horizontal angles that are read
during data collection and the resulting points are adjusted
accordingly. This will happen after survey with true azimuths or
performing stakeout in a special mode. If you do not want this to
happen, you should change this value to zero from the Backsight
Circle dialog box by tapping the Backsight Circle button.
Most non-staking related data collection is performed from the
Traverse / Sideshot screen. When you take a shot using the Traverse
button, the routine expects that you will eventually be occupying the
foresight that you are shooting and backsighting your current occupy
point. When you are ready to setup on the next point, the occupy,
foresight and backsight points will automatically be updated
accordingly.
After taking a shot using the Side Shot button, the routine does not
expect the total station to be moved before the next shot and will
therefore only automatically advance the foresight point.