@@ -42,13 +42,12 @@ var MapTiles = {

 # this is the callback that will be regularly called by the timer to update the map

     updateTiles : func() {

-        var lat = getprop('/position/latitude-deg');

-        var lon = getprop('/position/longitude-deg');

+#        me.group.setRotation(-data.hdg * D2R);

         var n = math.pow(2, me.zoom);

         var offset = [

-            n * ((lon + 180) / 360) - me.center_tile_offset[0],

-            (1 - math.ln(math.tan(lat * math.pi/180) + 1 / math.cos(lat * math.pi/180)) / math.pi) / 2 * n - me.center_tile_offset[1]

+            n * ((data.lon + 180) / 360) - me.center_tile_offset[0],

+            (1 - math.ln(math.tan(data.lat * math.pi/180) + 1 / math.cos(data.lat * math.pi/180)) / math.pi) / 2 * n - me.center_tile_offset[1]

         ];

         var tile_index = [int(offset[0]), int(offset[1])];

@@ -28,6 +28,8 @@ var data = { # set of data common to all devices

     alt : 0,

     hdg : 0,

     wow : 1,

+    lat : 0,

+    lon : 0,

     timers : {

         '20Hz': maketimer (

             0.05,

@@ -44,6 +46,8 @@ var data = { # set of data common to all devices

             1,

             func {

                 data.wow = getprop('/gear/gear/wow');

+                data.lat = getprop('/position/latitude-deg');

+                data.lon = getprop('/position/longitude-deg');

             }

         ),

     },