Google Maps
The Google Maps feature will show an interactive map to the given address on the details page.
Get an API key
To use this feature you need to get an API key from Google. It is free, you just have to request it.
A Google maps key is only good for the url it is assigned to. You need to make sure it is the directory that the scripts are in.
http://yoursite.com/listings is different than http://yoursite.com or http://yoursite.com/listings/next.
It needs to be set to the url to the details page.
http://yoursite.com/listings/details.php would be
http://yoursite.com/listings
Activate Google Maps Feature
You must provide an actual existing address for the map to show correctly.