Overlay default GMap view

Hi there,

Is there any solution for this feature already available on Drupal 7 ? I wonder if the module GMap Drupal 7 already has the functionality to amend GMaps API function initMap();

Basically, I need to amend GoogleMaps API source, within the fuction initMap()… in order to overlay the default GMap image. However, I’m unable to do so through GMap module GUI parameters. I believe I’d need to amend directly in the source code. Not sure where…

Does anyone have a clue where those function calls are located within the source code?

Best wishes

Drupal version: 

Source: https://www.drupal.org/taxonomy/term/22/feed