Hmmm. Last night everything was working well, but this morning not so much.

It seems to work better when "simulating" by dragging the view around than when actually tracking the device position. I am not sure why that is the case as all the gets used is the position and speed. And the speed is undefined all the time.
I definitely am using the wrong source for position updates (or using it wrong), but it will take a while to figure out what a better way would be.