Spectra Precision FAST Survey Reference Manual - Manual (Page 183)

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Any time Calculate is selected, the Review Resection screen appears. The input data is displayed in a list structure, and
you have the ability to turn certain measurements on/off and recalculate the solution, without the necessity of
re-measurement. You can also edit point numbers, instrument and rod heights, and more here. When satisfied with your
edits and the solution, you can store the results of the resection.
Since there is redundant data, the final calculated coordinate differs slightly from the individual measurements. The
command reports the calculated coordinate’s northing, easting, and elevation, and the difference between the calculated
coordinate and the individual solutions as residuals, which indicate the quality of the data. High residuals suggest a
problem with the input data. If you select the red X in the Review Resection Screen, you are returned to the Read screen
in case you want to collect more shots. Here in the Read screen you can truly Cancel if that is your intention. Shown
here is a resection to 2 points using D&R (direct and reverse), with angle only in the reverse face. Note that even in a
2-point resection, a closure calculation is presented.
In the “Store this Point?” dialog box shown below, you are prompted for the point number and description of the
calculated point (the occupied station/setup point). With three or more resection points, residuals are presented showing
the accuracy of the calculation. When you press OK from the "Store this Point?" dialog, you will be setup on the
calculated point backsighting the first point measured in the resection.