Most of the time when I use the navigation or other apps that require the 'gps', it can't find me exactly. Instead I see the blue circle around my position. One time it had me about 400 miles from where I really was. Why is this? It's getting pretty frustrating to speak an address in there and then navigate to it only to find that it doesn't really know where I am. Halfway through my drive I'll hear the lady start talking. Is there any way to tweak the gps to work better? Should I have something on that isn't?