# To review surveyed tunnel points

1. Tap and select Review.

2. Select the tunnel file. Tap Accept.

   The plan view of the tunnel appears.

   Stations with no scan points outside tolerance appear as solid green circles, while those with errors appear as solid red circles.

3. By default the first station is selected. Select other stations as required. The selected station appears as a red circle.
4. To view a summary for each station:
   1. Tap Results.
   2. Expand the station that you want to review. To view the number of:
      - Scanned points, the number of points within tolerance, and the number of points outside tolerance, expand the Scanned points record.
      - Set out points and the number of points within tolerance expand the Set out points record
      - Points in underbreak/overbreak and delta station, expand the Points outside tolerance record.
   3. Tap Close.
5. To view the cross section for the current station:
   1. Tap or press the Tab key to switch to cross section view.

   2. Tap and hold on the screen and then select Scanned points or Set out points.

      The selected mode, Scan or Set out, is shown at the top left of the screen.

   Each scanned position appears as a green circle if it is within tolerance or as a red circle if it is not within tolerance.

   Measured set out positions are indicated by a solid black circle.

   The point name, underbreak/overbreak and delta station values appear for the current position.

6. Tap other points to view their delta values.
7. To delete the selected point, tap and hold on the screen and then select Delete point. To restore deleted points, tap and hold on the screen and then select Restore deleted points.
8. To edit the selected point:
   1. Tap and hold on the screen and then select Edit point.

   2. Enter an Under/overbreak correction value.

      The displayed Underbreak/Overbreak value updates to reflect the correction. The correction is applied perpendicular to the tunnel design and is used to modify the original observation and calculate new HA, VA, and SD values. A note is attached to the cross section record in the job and records the name of the point edited, the original under/overbreak value, the correction applied, the new under/overbreak value and the original HA, VA and SD values.

      Use this option to correct scan points that have been measured to an obstacle other than the tunnel surface, for example ventilation ducting.

9. To view details for a selected point:
   1. Tap Details.

   2. Expand the point that you want to review.

      The Offsets (true), Offsets (rotated), Grid coordinates, Underbreak/Overbreak, and Delta station values are shown for each point. To view the:

      - Horizontal and vertical offsets from the intersection of the horizontal and vertical alignments to the scanned/measured position, expand the Offsets (true) record.
      - Rotated horizontal and vertical offsets from the intersection of the rotated horizontal and vertical alignments to the scanned/measured position, expand the Offsets (rotated) record.
      - North, east, and elevation values for the measured positions, expand the Grid record.
   3. Tap Close.
10. To close the Review screen, tap Esc.