To automatically update the coordinates attribute, setup the form found at {yoursite.com}/index.php/dashboard/system/attributes/geocode/.

Both an address and coordinates attribute must be available for the page, this addon will not automatically add these attributes to the Page, File, or User objects.

Note about the Google Geocoding API:

• Google imposes a limit of 2500 calls per day. https://developers.google.com/maps/documentation/geocoding/#Limits
• The Google Geocode API is intended only for use with other Google Maps products. Usage without displaying on a map is prohibited. https://developers.google.com/maps/terms#section_10_12