I've been using this app for a few years and apart from identifying known gold locations and lease boundaries I find the tracking very useful. BigL might be right on the software spying but then I take all the gold I can before I leave so there's not a lot to worry about. There are enough lazy buggers trying to follow others tracks instead of doing their own research that I doubt it matters much what the developer sees of our movements.
It's a great aid to keeping you on legal ground and for finding where those spots are. The other app I use regularly is GPS Kit, only on iPhone I think, it's a better tracker and has more options of measurement and photographs along your route.