If the boundaries are running magnetic north-south, then there is no way to make the property square. I'm sure there is a good reason to survey the lands as sq

If the boundaries are running magnetic north-south, then there is no way to make the property square. I'm sure there is a good reason to survey the lands as squares, rather than as trapezoids with the north/south borders running along the lines of longitude - just not sure what it is right now. The farmer wouldn't care - they would simply survey their property based on the property stakes - and, at 6 miles, their property corners would be close enough to right-angles they probably wouldn't notice, and certainly wouldn't care. And roads could then run all the way to the north pole, or from coast to coast, without having to detour (mountains, lakes, cities, rivers and other obstacles excepted).