Spectra Precision Survey Pro v4.6 Recon and Nomad User Manual - Manual (Page 128)

User’s Manual – Conventional Mode
118
When the Display Difference from Ref. DTM checkbox is unchecked, the
Datum field can be set to a reference elevation. Cut and fill volumes in
the 3D View screen will then be based on the difference of a
horizontal plane at the elevation specified here and the non-reference
DTM surface.
The View Direction (from view point to the center) settings allow you to
specify the exact horizontal and vertical angle in which to view the
DTM surface.
19. Tap from the 3D View Setting screen to return to the 3D View
screen.
20. Tap (Close) from the 3D View screen to return to the DTM Shot
screen. From there you can continue taking DTM stake shots.