To configure the survey style for a site calibration

1. Tap and select Settings / Survey styles. Select the required survey style.
2. Tap Site calibration.
3. The Fix H. scale field to 1.0: check box details whether the calibration computation should compute a horizontal scale factor or not:
• To compute the horizontal scale factor, make sure the check box is clear. (This is the default setting.) Use this option only if GNSS measurements need to be scaled to fit the local control. (GNSS measurements are usually more precise.)
• To fix the horizontal scale factor to 1.0, select the check box. Select the check box to avoid distorting the geometry of the GNSS network, but note that the calibration residuals will be higher.
4. For the Trimble Access software to automatically perform a calibration when you measure a calibration point, select the Auto calibrate check box. To switch automatic calibration off, clear the check box.
5. Select the vertical adjustment type to be computed and applied:
• The Constant adjustment only option will compute a vertical shift value to best fit the calibration point measured elevations to the control elevations.
• The Inclined plane option will compute a vertical shift plus north and east inclinations to best fit the calibration point measured elevations to the control elevations. Typically, the Inclined plane method will result in smaller vertical residuals than the Constant adjustment only method.
6. Select an observation type appropriate to a calibration point. The options for a calibration point are topo point or observed control point.

If you set the observation type to Topo point, all settings are defined in the survey style for a topo point.

7. If necessary, set the tolerances for maximum horizontal and vertical residuals, and maximum and minimum horizontal scale settings. These settings only apply to automatic calibration and do not affect manual calibration.

   You can also specify the maximum slope of the vertical adjustment plane. The software warns you if the slope in the north direction or the slope in the east direction exceeds this. Generally the default settings are appropriate.

8. Specify how the calibration points you measure will be named:
• In the Method field, choose one of the following options: Add prefix, Add suffix, or Add constant.
• In the Add field, enter the prefix, suffix, or constant.

The table below shows the different options and gives an example of each.

Option	What the software does	Example value in the Add field	Grid point name	Calibration point name
Same	Gives the calibration point the same name as the grid point	–	100	100
Add prefix	Inserts a prefix before the grid point name	GNSS_	100	GNSS_100
Add suffix	Inserts a suffix after the grid point name	_GNSS	100	100_GNSS
Add constant	Adds a value to the grid point name	10	100	110