Adding an id to markers and access them later

Adding markers

markers = ... // Fetch markers
Gmaps.store.markers = markers.map(function(m) {
  marker = handler.addMarker(m);
  marker.serviceObject.set('id', m.id); // You can add other attributes using set
  return marker;
}
handler.bounds.extendWith(Gmaps.store.markers);
handler.fitMapToBounds();

Retrieving a specific marker

Gmaps.store.markers.filter(function(m) { return m.serviceObject.id == id; })[0]

Real world example

For instance, here's how to define a function selectMarker(id) that adds a bouncing animation and pans to a specific marker

Gmaps.selectMarker = function(id) {
  $.each(Gmaps.store.markers, function() {
    if (this.serviceObject.id == id) {
      this.panTo();
      this.serviceObject.setAnimation(google.maps.Animation.BOUNCE);
    }
    else this.serviceObject.setAnimation(null);
  }
}

Usage

Gmaps.selectMarker(1);