Spectra Precision Survey Pro v3.80 Recon iPAQ Reference Manual - Manual (Page 114)

Survey Pro Reference Manual
R-108
When all observations are complete, the Results page displays the
computed azimuth to the backsight.
Results
BS D/R : is the horizontal angle recorded to the backsight for the
particular direct/reverse observation.
Azi D/R : is the computed azimuth to the backsight for the particular
direct/reverse observation.
Avg : is the computed average azimuth of the backsight, relative to
true north.
Grid Avg : is the computed average azimuth of the backsight, relative
to the local State Plane grid. This field is only displayed when a state
grid correction is applied.
Note: See the User’s Manual for more information on the usage of the
Solar Observation routine.