All drawings must be scaled correctly before beginning tracing on them. This can be done through the drawing properties.

 

 

 

If the scale is unknown  to the user then the correct scale can be done through the action "scale using line segment (m)" from the drawing actions.

 

 

The user must draw a line in the drawing that should be equal to the specified dimension. In the example below a line of the window width that is 0,4m. After the line is drawn the scale will be done automatically.

 

 

 

In order to be sure that the scale of the drawing is correct check the coordinates in the lower corner of the screen. In the figure below the drawing scale is not correct. It must be scaled by 0,001.