# Additional stakeout deltas to a DTM

You can display the cut/fill to a digital terrain model (DTM) during stakeout, where the horizontal navigation is relative to the road but the displayed cut/fill delta value is from your current position to a selected DTM.

1. At the stakeout screen, tap the Options softkey.

2. In the DTM group box, select the DTM.

3. If required, in the Offset to DTM field, specify an offset to the DTM. Tap and select whether the offset is to be applied vertical or perpendicular to the DTM.

4. In the Deltas group box, tap Edit and, if required, select the V. Dist DTM delta or the Perp. Dist to DTM delta. Tap Accept.

5. Stake out the road as usual.

   When a horizontal construction offset is applied, the cut/fill value reported is to the DTM at the position selected for stakeout and not to the DTM at your current position.

   When viewing the cross section, the DTM is displayed at your current position as a green line. A circle on the DTM indicates your position projected vertically to the surface.

To check layer thickness when constructing a road, define a DTM for the previous layer and then when staking out the current layer, tap Options and in the Deltas group box, tap Edit and select the V.Dist DTM delta.