Like others have said, I would compare it to other available sources but, the most important thing to remember is that the "survey is on the ground" as the first surveyor I worked under used to say. Which means its the monuments on the ground that control where the property line is. Being public land, I am guessing that the property line is clearly marked in the field. Just make sure you heed that information over whatever your App of choice says. Here is a post I made a couple years ago when some OnX reps were giving some REALLY BAD information on a podcast.
https://saddlehunter.com/community/index.php?threads/mapping-with-property-lines.4077/
My brutha
I heard the same comment on a MeatEater podcast and had the same reaction as you. In fact, there’s another thread on here where we went over this again.
I am also a Land Surveyor with multi state experience so trust us on this, lol.
Seriously though, there’s several things coming into play here that most folks can’t be expected to know about. Always, always, always tread carefully near the called for property lines when using any of the apps that show ownership. Use all the information available to you, but know that if you’re wrong you may well be facing the consequences.
In the aerial posted above notice the four arrows I drew. Notice how they point to four corners of a block of timber that looks IDENTICAL to the parcel drawn near it.....is it the projection of the property line layer that’s off? Is it the mosaic’d flat picture of a round earth that’s off? Is the inherent error in your GPS signal that’s off?
It’s a combination of all of them.