For a quick check, place the chakra on the plan with exact North at zero and read off the zones, for example to see that a staircase falls in the East-South-East; for a proper drawing mark all the zones on paper. With the tool, the zone map and the pad map together take about five minutes. AutoCAD can also be used, but you still need to know where to place and how far to rotate the chakra.
If Google Earth shows 350 degrees, the zero can be placed directly at 350, but thinking of it as a 10-degree tilt works from any side of the plot. Hilly areas make no difference to the method.