My wife and I found our first two last week without a GPS.
I knew the locations from the map in the report, and we followed the clues...
We now have a GPS, of the two we found this week, one we didn't really need it to find, the second, we would not have located without it.
Even with the GPS "telling me" what stump it was in it took me five minutes to find it, and there where at least a dozen stumps in the area.