SyncGPS adjusted

Runtime/DownloadTrees.cs

@@ -82,10 +82,15 @@ namespace Wander
         private List<TileDownload> requests = new List<TileDownload>();
         private List<Task<List<TreeIsland>>> treeIslandTasks;
 
-        public void SetGPSCoord(Vector2 gps)
+        public void SetGPSCoord(Vector4 gps)
         {
             wgs84Lat = gps.x;
             wgs84Lon = gps.y;
+            // Calc size at original zoom, we might use a diff zoom here (very likely).
+            float size = (gps.w*2+1)*gps.z; // (NumRings*2+1) is nTiles wide. Times gps.z == tileSize == totalSize.
+            float tileSize = (float)RDUtils.CalcTileSizeRD( zoom );
+            int numTiles   = Mathf.FloorToInt( (size + tileSize/2) / tileSize );
+            numRings = (numTiles-1)/2 + 1;
         }
 
         internal void CancelAndClean()