GeoLocation Autocomplete is based on the google map API.Get data from the same database used by Google Maps and Google+ Local. Places features more than 100 million businesses and points of interest that are updated frequently through owner-verified listings and user-moderated contributions.Return a list of places based on a user’s location or search string and select for any one to auto complete the billing address in the checkout page.
After activating the plugin click the setting.
The setting page like following picture.
Go to the checkout page and fill the address then u will see the auto complete address from google map.The following picture is example.
After select any one option then the remaining field will be automatically free fill.