Spectra Precision Survey Pro v4.5 Recon and Nomad User Manual - Manual (Page 178)

User’s Manual – Conventional Mode
168
Horizontal Curve Layout
The Horizontal Curve Layout screen is useful to compute the
locations of any station along a horizontal curve using one of four
different methods. The values computed can be written down and
used to later stake those stations in the field.
1. Tap . Curve , Curve Layout from the Main Menu.
2. Select the method that you want to use to compute your curve
layout data in the Method field. Each method is described below.
PC Deflection
The PC Deflection method computes a chord
length from the PC to the current station and a
deflection angle between the PC-PI line and the
chord.
RP
Chord
PT
PI
PC
Deflection
Current
Station
PI Deflection
The PI Deflection method computes the distance
from the PI to the current station and the
deflection angle between the PI-PC line and the
PI to Station.
RP
PT
PI
PC
Current
Station
Deflection
PI to Station