This is not a bad system to obtain true north/south. He says to use Google Earth, but you actually have to download Google Earth Pro (free). Just scroll and click on the "Polar alignment using assistance from Google Earth" tab. As you will see, he uses a digital inclinometer app on his iphone to set the altitude.
I can't really use it at my place because I have no real line of sight to the north or south because of tree but it will work in many situations.
https://joe-cali.com/
Good luck with whichever system you use.
Michael