anchor.diff:        return marker;
       });
       
  -    new MarkerClusterer(
  -      map,
  -      markers,
  -      {
  -        imagePath: "https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m"
  -      }
  -    );
  +    <% if marker_cluster %>
  +      new MarkerClusterer(
  +        map,
  +        markers,
  +        {
  +          imagePath: "https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m"
  +        }
  +      );
  +    <% end %>
     }
   </script>
  
positive.code:         position: location.position,
          label: location.label,
          title: location.tooltip,
        });
        if (location.popupHtml) {
          var infoWindow = new google.maps.InfoWindow({
  
negative.code:     # https://developers.google.com/maps/documentation/javascript/tutorial#zoom-levels
      zoom = 10
    end
  end
  if !defined?(marker_cluster)
    marker_cluster = false
  end
  Rails.logger.debug{"map/display latitude: #{defined?(latitude)}, #{latitude.inspect}"}
  if !defined?(latitude) || latitude.nil?
  