Hey James,

You can modify on following files :

JoomlaFolder/media/com_easysocial/scripts/vendors/gmaps.js

// LINE 1615

      if (!options.zoom){

        options.zoom = 15;

      }

JoomlaFolder/media/com_easysocial/scripts/site/locations/popbox.js (location pop-up)

// LINE 14

				url = "//maps.googleapis.com/maps/api/staticmap?key=" + apiKey + "&size=400x200&sensor=true&zoom=15¢er=" + lat + "," + lng + "&markers=" + lat + "," + lng + "&language=" + language;

After you modified, you have to temporary turn on the development mode from your backend > easysocial > setting > general > system , and check whether that zoom value is it show correct as what you modified.

If yes, you have to manually recompile it on your site in order to update on the compiled js file when you switch back to production mode.

http://yoursite.com/index.php?option=com_easysocial&compile=1&minify=1

Note : You need to login as Superadmin on frontpage before you run this compile URL.