Make sure google maps isn't zoomed too far in when updating locations. You might want this because when one location is returned the map will be zoomed in as far as it can go. So you might want to make sure the zoom level never goes past a certain point.

gistfile1.js

/*
	call this snippet after you call map.fitBounds();
	replace "map" with the instance to your map
	change the zoomThreshold to the zoom level you want the map never to zoom
	past when loading locations
*/
google.maps.event.addListenerOnce(map, 'zoom_changed', function() {
	var oldZoom = map.getZoom(),
  		zoomThreshold = 16;
	if (oldZoom > zoomThreshold) {
		map.setZoom(zoomThreshold);
	}
});