<ace:gMapAutocomplete> allows for users to tap into the Google Autocomplete database, automatically zooming and recentering when a location is chosen from the dropdown menu created.
Relevant sections of the Google Maps API: Autocomplete
NOTE: In order to use this subcomponent, the places library must be loaded. The easiest way to accomplish this is by appending '&libraries=places' to the gMap key in the application's web.xml.