Hey Maxpower42 & Looniper,
If you’re looking for a way to test if a point is reachable by a pawn, I’d recommend taking a look at the thread linked below, if you’re working in C++, that is. I don’t know of a way to do this in blueprint at the current time, so I’d definitely recommend giving that solution a try
As far as the function returning invalid values goes, this was a known bug that has been resolved as of 4.15:
If you’re using a source build, you can merge the fix commit in now and it should resolve the issue, but feel free to let me know if it still occurs.
Let me know if that helps and if you have any further questions regarding this.