diff --git a/vtm/src/org/oscim/map/Map.java b/vtm/src/org/oscim/map/Map.java
index a360efe2..e10f5303 100644
--- a/vtm/src/org/oscim/map/Map.java
+++ b/vtm/src/org/oscim/map/Map.java
@@ -2,6 +2,7 @@
  * Copyright 2013 Hannes Janetzek
  * Copyright 2016 Andrey Novikov
  * Copyright 2016 Stephan Leuschner
+ * Copyright 2016 devemux86
  *
  * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
  *
@@ -25,7 +26,6 @@ import org.oscim.event.Event;
 import org.oscim.event.EventDispatcher;
 import org.oscim.event.EventListener;
 import org.oscim.event.Gesture;
-import org.oscim.event.GestureDetector;
 import org.oscim.event.MotionEvent;
 import org.oscim.layers.Layer;
 import org.oscim.layers.MapEventLayer;
@@ -106,7 +106,6 @@ public abstract class Map implements TaskQueue {
     protected final MapPosition mMapPosition;
 
     protected final MapEventLayer mEventLayer;
-    protected GestureDetector mGestureDetector;
 
     protected boolean mClearMap = true;
 
@@ -147,7 +146,7 @@ public abstract class Map implements TaskQueue {
     /**
      * Create OsmTileLayer with given TileSource and
      * set as base map (layer 1)
-     * <p/>
+     * <p>
      * TODO deprecate
      */
     public VectorTileLayer setBaseMap(TileSource tileSource) {
@@ -239,7 +238,7 @@ public abstract class Map implements TaskQueue {
     public abstract boolean postDelayed(Runnable action, long delay);
 
     /**
-     * Post a task to run on a shared worker-thread. Shoul only use for
+     * Post a task to run on a shared worker-thread. Should only use for
      * tasks running less than a second.
      */
     @Override
@@ -342,7 +341,7 @@ public abstract class Map implements TaskQueue {
 
     /**
      * This function is run on main-thread before rendering a frame.
-     * <p/>
+     * <p>
      * For internal use only. Do not call!
      */
     protected void prepareFrame() {
@@ -353,10 +352,11 @@ public abstract class Map implements TaskQueue {
         mAnimator.updateAnimation();
 
         boolean changed = mViewport.getMapPosition(pos);
+        boolean sizeChanged = mViewport.sizeChanged();
 
         if (mClearMap)
             events.fire(CLEAR_EVENT, pos);
-        else if (changed)
+        else if (changed || sizeChanged)
             events.fire(POSITION_EVENT, pos);
         else
             events.fire(UPDATE_EVENT, pos);
diff --git a/vtm/src/org/oscim/map/ViewController.java b/vtm/src/org/oscim/map/ViewController.java
index a9c51be5..47e1973f 100644
--- a/vtm/src/org/oscim/map/ViewController.java
+++ b/vtm/src/org/oscim/map/ViewController.java
@@ -136,9 +136,6 @@ public class ViewController extends Viewport {
      * Scale map by scale width center at pivot in pixel relative to
      * screen center. Map scale is clamp to MIN_SCALE and MAX_SCALE.
      *
-     * @param scale
-     * @param pivotX
-     * @param pivotY
      * @return true if scale was changed
      */
     public boolean scaleMap(float scale, float pivotX, float pivotY) {
@@ -172,10 +169,6 @@ public class ViewController extends Viewport {
     /**
      * Rotate map by radians around pivot. Pivot is in pixel relative
      * to screen center.
-     *
-     * @param radians
-     * @param pivotX
-     * @param pivotY
      */
     public void rotateMap(double radians, float pivotX, float pivotY) {
         ThreadUtils.assertMainThread();
@@ -269,6 +262,12 @@ public class ViewController extends Viewport {
         return mNextFrame;
     }
 
+    boolean sizeChanged() {
+        synchronized (mNextFrame) {
+            return mNextFrame.sizeChanged(this);
+        }
+    }
+
     void syncViewport() {
         synchronized (mNextFrame) {
             mNextFrame.copy(this);
diff --git a/vtm/src/org/oscim/map/Viewport.java b/vtm/src/org/oscim/map/Viewport.java
index b42f39a4..062dedf9 100644
--- a/vtm/src/org/oscim/map/Viewport.java
+++ b/vtm/src/org/oscim/map/Viewport.java
@@ -26,20 +26,16 @@ import org.oscim.core.Point;
 import org.oscim.core.Tile;
 import org.oscim.renderer.GLMatrix;
 import org.oscim.utils.FastMath;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /**
  * The Viewport class contains a MapPosition and the projection matrices.
  * It provides functions to modify the MapPosition and translate between
  * map and screen coordinates.
- * <p/>
+ * <p>
  * Public methods are thread safe.
  */
 public class Viewport {
 
-    static final Logger log = LoggerFactory.getLogger(Viewport.class);
-
     private final static int MAX_ZOOMLEVEL = 20;
     private final static int MIN_ZOOMLEVEL = 2;
     private final static float MIN_TILT = 0;
@@ -389,8 +385,12 @@ public class Viewport {
         }
     }
 
+    boolean sizeChanged(Viewport viewport) {
+        return mHeight != viewport.mHeight || mWidth != viewport.mWidth;
+    }
+
     protected boolean copy(Viewport viewport) {
-        boolean sizeChanged = mHeight != viewport.mHeight || mWidth != viewport.mWidth;
+        boolean sizeChanged = sizeChanged(viewport);
 
         mHeight = viewport.mHeight;
         mWidth = viewport.mWidth;