Spectra Precision Survey Pro v4.5 Recon and Nomad Reference Manual - Manual (Page 351)

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Inverse Menu
The Inverse Menu contains routines that compute the direction and
distance between two objects. The following screens are available
from the Inverse Menu:
A: Inverse Point to Point
B: Inverse Point to Line
C: Inverse Point to Polyline
D: Inverse Point to Multiple Points
E: Inverse Point to Location / Point