# To key in the horizontal alignment

Use the steps below to key in the horizontal alignment for the selected tunnel. To define the horizontal alignment by selecting items from the map, see To define the tunnel from the map.

1. Tap Horizontal alignment.

2. Tap New.

   The Element field is set to Start point.

3. To define the start point:
   1. Enter the Start station.

   2. In the Method field, select:

      - Key in coordinates and then enter values in the Start north and Start east fields.

      - Select point and then enter the Point name.

        The Start north and Start east fields will update with the values for the entered point.

        To edit the Start north and Start east values when they have been derived from a point, change the method to Key in coordinates.

   3. Enter the Station interval.

   4. Tap Store.

      The start point appears in the graphical view.

4. To add elements to the alignment:

   1. Tap New.

   2. Select the Element type and fill out the remaining fields.

      For more information, refer to the topic for the selected entry method.

   3. Tap Store.

      The element appears in the graphical view.

   4. Continue adding elements as required.

      Each element is added after the previous element. To insert it at a particular place, highlight the element in the graphical view that you want it to follow and tap New.

5. When you are done, tap Accept.
6. Enter the other tunnel components, or tap Store to store the tunnel definition.