This significantly improves location accuracy. BUT, the way Google creates the data needed for this is EXTREMELY shady. While you can disable location service

This significantly improves location accuracy. BUT, the way Google creates the data needed for this is EXTREMELY shady. While you can disable location services, Google wverything in its power to make you give them location information that can be paired with something. Example: you CAN NOT set up a chromecast without giving Google your location. This allows google to pair at least 2 wi-fi macs to a physical location.