diff --git a/libs/map/mapview.cpp b/libs/map/mapview.cpp
index ab250d8..318e39a 100644
--- a/libs/map/mapview.cpp
+++ b/libs/map/mapview.cpp
@@ -92,21 +92,25 @@ void MapView::setCachePath(const QString & p) {
 }
 
 
-void collectDownloadIndeces(QQueue<OSM::TileIndex> & indeces, OSM::TileIndex index, int target_zoom_level) {
-	indeces << index;
+void collectDownloadIndeces(OSMTileCache * cache, QQueue<OSM::TileIndex> & indeces, OSM::TileIndex index, int target_zoom_level, bool only_new) {
+	if (only_new) {
+		if (!cache->isTileFileExists(index))
+			indeces << index;
+	} else
+		indeces << index;
 	if (index.z >= target_zoom_level) return;
 	int z = index.z + 1;
 	int x = index.x * 2;
 	int y = index.y * 2;
 	for (int i = 0; i < 2; ++i) {
 		for (int j = 0; j < 2; ++j) {
-			collectDownloadIndeces(indeces, (OSM::TileIndex){z, x + i, y + j}, target_zoom_level);
+			collectDownloadIndeces(cache, indeces, (OSM::TileIndex){z, x + i, y + j}, target_zoom_level, only_new);
 		}
 	}
 }
 
 
-void MapView::downloadCurrentView(int target_zoom_level) {
+void MapView::downloadCurrentView(int target_zoom_level, bool only_new) {
 	int sx            = qMax(0, (int)floor(view_rect.left() * tiles_side));
 	int sy            = qMax(0, (int)floor(view_rect.top() * tiles_side));
 	int ex            = qMin(tiles_side, (int)ceil(view_rect.right() * tiles_side));
@@ -115,7 +119,7 @@ void MapView::downloadCurrentView(int target_zoom_level) {
 	QQueue<OSM::TileIndex> indeces;
 	for (int ix = sx; ix < ex; ++ix) {
 		for (int iy = sy; iy < ey; ++iy) {
-			collectDownloadIndeces(indeces, (OSM::TileIndex){zoom_level, ix, iy}, target_zoom_level);
+			collectDownloadIndeces(cache, indeces, (OSM::TileIndex){zoom_level, ix, iy}, target_zoom_level, only_new);
 		}
 	}
 	if (indeces.size() < 4) return;
@@ -166,6 +170,7 @@ void MapView::downloadCurrentView(int target_zoom_level) {
 void MapView::mousePressEvent(QMouseEvent * e) {
 	is_pan           = false;
 	press_point      = e->pos();
+	zoom_anchor      = press_point;
 	last_click_coord = OSM::xy2geo(mapToNorm(press_point));
 }
 
@@ -199,6 +204,11 @@ void MapView::mouseMoveEvent(QMouseEvent * e) {
 			if ((e->pos() - press_point).manhattanLength() >= QApplication::startDragDistance()) is_pan = true;
 		}
 	}
+	if (e->buttons() == Qt::RightButton) {
+		auto dp = e->pos() - press_point;
+		press_point = e->pos();
+		zoom(1. - dp.y() / 50., zoom_anchor);
+	}
 	updateMouse(e->pos());
 }
 
diff --git a/libs/map/mapview.h b/libs/map/mapview.h
index 33888a5..a417102 100644
--- a/libs/map/mapview.h
+++ b/libs/map/mapview.h
@@ -61,7 +61,7 @@ public:
 	QString cachePath() const;
 	void setCachePath(const QString & p);
 
-	void downloadCurrentView(int target_zoom_level = 17);
+	void downloadCurrentView(int target_zoom_level = 17, bool only_new = true);
 
 protected:
 	QSize sizeHint() const override { return QSize(200, 200); }
@@ -92,7 +92,7 @@ private:
 	MapItemBase * hover        = nullptr;
 	QPointF center_            = QPointF(0.5, 0.5);
 	QPointF last_click_coord   = center_;
-	QPoint press_point;
+	QPoint press_point, zoom_anchor;
 	QPixmap background;
 	QRectF view_rect;
 	QVector<MapItemBase *> items_;
diff --git a/libs/map/osm_tile_cache.cpp b/libs/map/osm_tile_cache.cpp
index 8252c14..ec9a66b 100644
--- a/libs/map/osm_tile_cache.cpp
+++ b/libs/map/osm_tile_cache.cpp
@@ -54,6 +54,14 @@ OSM::TilePixmap OSMTileCache::getTile(OSM::TileIndex index, QRectF & rect_src) {
 }
 
 
+bool OSMTileCache::isTileFileExists(OSM::TileIndex index) const {
+	QString hashdir = index.cacheDir();
+	if (!cache_dir.exists(hashdir)) return false;
+	QString hashname = hashdir + "/" + index.hashName();
+	return cache_dir.exists(hashname);
+}
+
+
 void OSMTileCache::setCacheRoot(const QString & p) {
 	cache_root = p;
 	cache_dir.setPath(cache_root);
diff --git a/libs/map/osm_tile_cache_p.h b/libs/map/osm_tile_cache_p.h
index a008a31..8b0a731 100644
--- a/libs/map/osm_tile_cache_p.h
+++ b/libs/map/osm_tile_cache_p.h
@@ -50,6 +50,8 @@ public:
 	void tileDownloaded(OSM::TileIndex index, const QPixmap & pixmap);
 	OSM::TilePixmap getTile(OSM::TileIndex index, QRectF & rect_src);
 
+	bool isTileFileExists(OSM::TileIndex index) const;
+
 	QString cacheRoot() const { return cache_root; }
 	void setCacheRoot(const QString & p);