Gmaps4rails V2 - change default zoom

remove:

handler.fitMapToBounds();

Replace with:

handler.getMap().setZoom(yourValue);

Just Try This,<script type="text/javascript">      handler = Gmaps.build('Google');      handler.buildMap({ provider: { Zoom: 3 }, internal: {id: 'map'}}, function(){      markers = handler.addMarkers(<%=raw @hash.to_json %>);      handler.bounds.extendWith(markers);      handler.fitMapToBounds();      }); </script> 

OR

handler.getMap().setZoom(yourValue);

It Should work.....

Another option is to use handler.map.centerOn(marker):

      handler = Gmaps.build('Google');      handler.buildMap({      provider: {        draggable: false,        Zoom: 15      },      internal: {        id: 'map'      }    },    function(){      marker = handler.addMarker(        {          "lat": lat,          "lng": lng,          "picture": {            "url": "https://addons.cdn.mozilla.net/img/uploads/addon_icons/13/13028-64.png",            "width":  36,            "height": 36          },          "infowindow": "hello!"        }      );      handler.map.centerOn(marker);    }  );