The land ownership overlays are either "east" or "west" side of the US.
My brother lives in WY and I rigged his car GPS with an SD card that had the western states government land ownership overlays. He likes that for when he is looking for government land to fish on. That overlay map even differnciates between state and federal.
I live in the SE and use the eastern LO maps. From what I've seen, most boundaries are fairly accurate. You have to take in to consideration that there will be inaccuracies because the original data comes from the government.
So it is more "ball park" than precise. Same thing happens when you type in an address into a car GPS and it misses the exact place. That is not the GPs unit's fault, it was the original government data. The GPS is capable of 30' accuracy.