It is exactly that. Increased accuracy. Think of driving on a tight street, buildings left and right and buildings with 10-15 floors. It will take forever for t

It is exactly that. Increased accuracy. Think of driving on a tight street, buildings left and right and buildings with 10-15 floors. It will take forever for the GPS to get "enough" to be able to give you an accurate reading fast. But if 20 cars have passed in various speeds, you will get an estimate much faster. I have actually tested this. It would take 45sec with just GPS, but under 7sec with WiFi. Knowing Google's ethics (haha) they will definitely use this data also to advertise services to the people living there, as "now" they know exactly where you live and thus may push more relevant ads instead of a random store 500km away.