Spectra Precision FAST Survey Reference Manual - Manual (Page 191)

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Click the Select button to the right of the Level File to open an existing loop or start a new loop. The user will be
prompted to enter loop data, such as project name and operator, when creating a new loop.
Use the Select Road button to choose the horizontal and vertical alignments you wish to associate.
Click the Use Road Files toggle to enable the use of the selected files. If Use Road Files is turned off, the STA+ tab
will not be shown.
After the loop has been opened or created, select the Green Check button (OK) to advance to the measuring screens.
The first reading of the loop must be a benchmark (plus) reading to establish the instrument height. Enter the point ID or
known benchmark elevation, the prism height (trig levels), and a description. Then press the Read icon or Enter to
measure. Once the reading has been taken, select the Store icon to keep it. You can take as many readings on a single
point in any face that you like. You can also review the readings, and disable any that you don't like prior to storing.