I have only usually seen stuff like this when a GPS is used in the middle of town. It is usually due to multi-path of the GPS signals which messes up the timing of the signal received by the GPS. Then you get a bad reading from the GPS.
I have seen it on rare occasions in heavy green vegetation, but usually not above the tree line. I wonder if the new green spring growth gave us a little multi-path?
Cool data Jared. Glad to see Jake is still floating around. Have not seen him in a while. Just his wife Shelley.
Thanks for the pics. Sorry I couldn't chase with you all today. Getting a scout trailer ready for scout camp and a bad back make for a sore day.