Spectra Precision FAST Survey Reference Manual - Manual (Page 211)

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Select OK, and the map screen will display showing circles radiating from the first and second selected base points.
Lines leading from both base points to the two possible intersections of the circles are also shown.
Pressing Enter or Store will display the prompt "Pick a Solution". Select the desired calculated solution. To select the
point, simply pick it from the screen. Picking near the desired solution is sufficient. The program will select the nearest
solution position. Pressing Enter again will accept the second possible solution for the intersection. If there was no
solution for the input data, FAST Survey will display "No Valid Solution".
Point Projection
This command allows you to calculate the station and offset of any entered or surveyed point relative to a known
centerline or baseline. Note that the Station Store command will calculate a point at a given station and offset. Point
Projection does just the reverse — it calculates a station and offset for any given point. It also will calculate the
“Intersect”, or the projection of that offset point on the baseline. This baseline “intersect”, or perpendicular projection
point, can be staked out and stored. The application of the routine is shown below.