Hi,
Unfortunately it's currently not supported to add an overlay image to the map.
However this is a good suggestion and we'll have to investigate if this kind of feature is supported by the Google Maps API and if this functionality can be added to TWebGMaps in a future version.
However this is a good suggestion and we'll have to investigate if this kind of feature is supported by the Google Maps API and if this functionality can be added to TWebGMaps in a future version.