I aligned my weather station to true south by using Google Earth. It only works if you are going to use the same position or very close. What I did was to draw a line from my weather station position to the south pole on Google earth. Then I zoomed into my house and noted where the line intersected a prominent landmark. (for me it was a high tension tower about 4 miles away. ) Don't see why this couldn't work for true north as well, just draw the line to the north pole. I have to think it is quite accurate as well. Best think is it's zero cost to try.