I believe it keeps GPS positioning to a minimum, relying primarily on network-derived location data. At least judging by the granularity (or lack of) the route

I believe it keeps GPS positioning to a minimum, relying primarily on network-derived location data. At least judging by the granularity (or lack of) the route data, which causes my commute to work to look most confusing. Secondly, and this in my opinion is a bug in their algorithm, when I'm at home it frequently switches to my home location and a location about 10 miles away. The only reason I can see for it to do this is it's predicting my location based on my cell site location (phones know which tower they're connected to, Google must know where all these towers are). And my normal cell tower is 5 miles away (right in the middle of my two "locations"), so clearly the algorithm has determined I'm 5 miles away from a cell tower, but can't make up it's mind in which direction. It needs tweaking to remove data points when I suddenly cover 10 miles in a second, over and over.