Spectra Precision Layout Pro Field Software Quick Start Guide - Manual (Page 25)

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6. Select Compute Angle to compute the angle between any
three points:
7. Select Compute Down & Out to compute a point’s down and
out distance from a line that you specify:
The blue line is the reference line. The red section that is
overlaid on the blue line is the “down” portion. The red
perpendicular line is the “out” portion.