Meteor google maps on SPA question

Template.NotFound.onCreated(function () {
  
   GoogleMaps.ready('map2', function(map2) {
      
      google.maps.event.addListener(map2.instance, 'click', function(event) {
        Markers.insert({ lat: event.latLng.lat(), lng: event.latLng.lng() });
      });
    
      var markers = {};

      Markers.find().observe({
        added: function (document) {
          var marker = new google.maps.Marker({
            draggable: true,
            animation: google.maps.Animation.DROP,
            position: new google.maps.LatLng(document.lat, document.lng),
            map: map2.instance,
            id: document._id
          });

          google.maps.event.addListener(marker, 'dragend', function(event) {
            Markers.update(marker.id, { $set: { lat: event.latLng.lat(), lng: event.latLng.lng() }});
          });

          markers[document._id] = marker;
        },
        changed: function (newDocument, oldDocument) {
          markers[newDocument._id].setPosition({ lat: newDocument.lat, lng: newDocument.lng });
        },
        removed: function (oldDocument) {
          markers[oldDocument._id].setMap(null);
          google.maps.event.clearInstanceListeners(markers[oldDocument._id]);
          delete markers[oldDocument._id];
        }
      });
    });
    
    
 var self = this;

  GoogleMaps.ready('map', function(map) {
    var marker;

    // Create and move the marker when latLng changes.
    self.autorun(function() {
      var latLng = Geolocation.latLng();
      if (! latLng)
        return;

      // If the marker doesn't yet exist, create it.
      if (! marker) {
        marker = new google.maps.Marker({
          position: new google.maps.LatLng(latLng.lat, latLng.lng),
          map: map.instance
        });
      }
      // The marker already exists, so we'll just change its position.
      else {
        marker.setPosition(latLng);
      }

      // Center and zoom the map view onto the current position.
      map.instance.setCenter(marker.getPosition());
      map.instance.setZoom(MAP_ZOOM);
    });
  });		
});