Spectra Precision Survey Pro v4.9 - Manual (Page 210)

[Layout]: computes the location of the Current Station.
Results
Station: is the current station.
Deflection: is the horizontal angle to the current station as if occupying the TS and backsighting the Spiral PI.
Long crd.: is the chord length from the TS to the current station.
Short crd.: is the chord length from the previous station to the current station.
Traverse on Spiral
[Curve] [Spiral]
The Traverse on Spiral screen is used to compute the location of, and optionally store the SC, or ST and spiral PI
points.
Radius: is the radius of the circular curve.
Length: is the length along the spiral curve from TS to SC.
TS / CS Point: is the existing point associated with the TS or CS point.
[Azimuth] / [Bearing]: is the tangent direction at the TS or CS point.
TS->SC: specifies that the curve starts at the tangent to spiral and ends at the spiral to curve.
CS->ST: specifies that the curve starts at the curve to spiral and ends at the spiral to tangent.
Right / Left: specifies is the curve turns toward the right or left as you face the spiral from the TS or CS.
Store SC / ST: When checked, saves a point for the computed SC point.
Store PI: When checked, saves a point for the computed spiral PI.
Results
Tangent: the tangent direction entering the spiral at the TS or CS.
Tangent Out: the tangent direction exiting the spiral at the SC or ST.
X of Throw: is the distance along the tangent where a perpendicular line intersects with the radius point.
Y of Throw: is the minimum distance between the tangent and the extended circular curve.
X: is the distance from the TS to the SC along the tangent.
Y: is distance from the SC to the tangent.
Delta: is the angle between the tangent, and the line between the PI and SC.
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