Spectra Precision Survey Pro v4.6 Recon-Nomad Reference Manual - Manual (Page 75)

Job Menu
R-67
Note, if is selected in the list, the <-Insert button will change
to an <-Append button to indicate that additional points will be
appended to the end of the list.
Screen Four – Add/Edit Curve
The fourth screen is used to modify a selected polyline segment that
occurs between two points. A horizontal, vertical, and/or spiral curve
can be applied to the polyline segment.
Adding a Horizontal Curve
Tap the Arc / Spiral tab.
Curve: must be set to Arc to enter a horizontal curve.
Radius | Delta | Degree Arc | Degree Chord :
allows you to specify the radius of the curve using a
variety of methods.
Turn: specifies if the curve turns toward the Right or Left
as you occupy the initial point and face the end point.
Arc: specifies if the arc of the curve is Small (less than
180°) or Large (greater than 180°).