Check in the Extension Manager if the JavaScript library should be load from the extension.
Include the TypoScript from go_maps_ext.
Create a Map.
Set title, width and height of the Map and save.
If you haven’t include a KML file on the map create an Google Maps
address. Set title, enter the address or coordinates by the postion
field, press the ‘Update’ button and save.
Include the address in the map.
Create a page content of the type plugin. Choose Google Map and select
the map.
