Spectra Precision Survey Pro v3.80 Recon iPAQ Reference Manual - Manual (Page 193)

Curve Menu
R-187
Results:
Radius : is the distance from the radius point to the curve.
Delta : is the deflection angle.
Tangent : is the distance from the PC or PT to the PI.
Three Point Curve
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The Three Point Curve screen will compute the details of a curve
when three points of the curve are specified; the PC, PT and any
other point on the curve; or the PC, PT and radius point.
First point : is the first point from the current job that
defines the curve. The specified point can be either the
PC or the Radius Point by selecting the appropriate radio
button.
Note : The selection made for the first point determines
the available choices in the remaining fields.
Pt. on Curve : is any point that lies on the curve between
the PC and PT.
PC : is the point that defines the beginning of the curve
(Point of Curvature).
PT : is the point that defines the end of the curve (Point of
Tangency).
;
Store RP : When checked, the radius point will be computed and
stored with the name specified here.