Spectra Precision Survey Pro v4.5 Recon and Nomad Reference Manual - Manual (Page 71)

Job Menu
R-63
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°).
Adding a Spiral
Tap the Arc / Spiral tab.
Curve: must be set to Spiral to enter a spiral curve.
Radius: is the radius of the spiral curve. (The same
radius of the circular curve adjacent to the spiral.)
Length: is the length of the spiral, measured along the
curve from the TS to the SC.
Turn: specifies if the spiral curve turns to the Right or
Left as you occupy the initial point and face the end
point.
Direction: specifies if the curve runs from where the
tangent intersects with the spiral toward where the
spiral intersects with the curve (TS->SC) or if the curve
runs from where the curve intersects with the spiral toward where
the spiral intersects with the tangent (CS->ST).