diff --git a/django/contrib/gis/maps/google/gmap.py b/django/contrib/gis/maps/google/gmap.py
index dd4f67bc52..de8f75c5a0 100644
--- a/django/contrib/gis/maps/google/gmap.py
+++ b/django/contrib/gis/maps/google/gmap.py
@@ -143,7 +143,7 @@ class GoogleMap(object):
     @property
     def icons(self):
         "Returns a sequence of GIcon objects in this map."
-        return [marker.icon for marker in self.markers if marker.icon]
+        return set([marker.icon for marker in self.markers if marker.icon])
 
 class GoogleMapSet(GoogleMap):
 
@@ -221,6 +221,6 @@ class GoogleMapSet(GoogleMap):
     @property
     def icons(self):
         "Returns a sequence of all icons in each map of the set."
-        icons = []
-        for map in self.maps: icons.extend(map.icons)
+        icons = set()
+        for map in self.maps: icons |= map.icons
         return icons
diff --git a/django/contrib/gis/maps/google/overlays.py b/django/contrib/gis/maps/google/overlays.py
index 4f1247d0a4..c2ebb3c992 100644
--- a/django/contrib/gis/maps/google/overlays.py
+++ b/django/contrib/gis/maps/google/overlays.py
@@ -231,6 +231,14 @@ class GIcon(object):
         self.iconanchor = iconanchor
         self.infowindowanchor = infowindowanchor
 
+    def __cmp__(self, other):
+        return cmp(self.varname, other.varname)
+    
+    def __hash__(self):
+        # XOR with hash of GIcon type so that hash('varname') won't 
+        # equal hash(GIcon('varname')).
+        return hash(self.__class__) ^ hash(self.varname)
+
 class GMarker(GOverlayBase):
     """
     A Python wrapper for the Google GMarker object.  For more information