diff --git a/libs/map/mapview.cpp b/libs/map/mapview.cpp
index 318e39a..2406ddb 100644
--- a/libs/map/mapview.cpp
+++ b/libs/map/mapview.cpp
@@ -92,10 +92,18 @@ void MapView::setCachePath(const QString & p) {
 }
 
 
-void collectDownloadIndeces(OSMTileCache * cache, QQueue<OSM::TileIndex> & indeces, OSM::TileIndex index, int target_zoom_level, bool only_new) {
+void MapView::setTileObsoleteTime(int secs) {
+	cache->setTileObsoleteTime(secs);
+}
+
+
+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;
+		if (!cache->isTileFileExists(index)) indeces << index;
 	} else
 		indeces << index;
 	if (index.z >= target_zoom_level) return;
@@ -205,7 +213,7 @@ void MapView::mouseMoveEvent(QMouseEvent * e) {
 		}
 	}
 	if (e->buttons() == Qt::RightButton) {
-		auto dp = e->pos() - press_point;
+		auto dp     = e->pos() - press_point;
 		press_point = e->pos();
 		zoom(1. - dp.y() / 50., zoom_anchor);
 	}
diff --git a/libs/map/mapview.h b/libs/map/mapview.h
index a417102..b2c28d7 100644
--- a/libs/map/mapview.h
+++ b/libs/map/mapview.h
@@ -61,6 +61,8 @@ public:
 	QString cachePath() const;
 	void setCachePath(const QString & p);
 
+	void setTileObsoleteTime(int secs);
+
 	void downloadCurrentView(int target_zoom_level = 17, bool only_new = true);
 
 protected:
diff --git a/libs/map/osm_tile_cache.cpp b/libs/map/osm_tile_cache.cpp
index ec9a66b..1cfa18c 100644
--- a/libs/map/osm_tile_cache.cpp
+++ b/libs/map/osm_tile_cache.cpp
@@ -31,8 +31,10 @@ void OSMTileCache::tileDownloaded(OSM::TileIndex index, const QPixmap & pixmap)
 
 OSM::TilePixmap OSMTileCache::getTile(OSM::TileIndex index, QRectF & rect_src) {
 	OSM::TilePixmap ret = getTileFromCache(index);
-	if (ret.isEmpty()) {
+	if (ret.isEmpty() || ret.obsolete) {
 		parent->downloader->queueTile(index);
+	}
+	if (ret.isEmpty()) {
 		QVector<QPointF> offsets;
 		while (index.z >= 0) {
 			index.z--;
@@ -81,10 +83,15 @@ OSM::TilePixmap OSMTileCache::getTileFromCache(OSM::TileIndex index) {
 		if (cache_dir.exists(hashdir)) {
 			QString hashname = hashdir + "/" + index.hashName();
 			if (cache_dir.exists(hashname)) {
-				ret.pixmap.load(cache_dir.absoluteFilePath(hashname), "png");
+				QString fname = cache_dir.absoluteFilePath(hashname);
+				ret.pixmap.load(fname, "png");
 				tile         = new OSM::TilePixmap();
 				tile->index  = index;
 				tile->pixmap = ret.pixmap;
+				if (secs_obsolete > 0) {
+					int secs_old = QFileInfo(fname).lastModified().secsTo(QDateTime::currentDateTime());
+					ret.obsolete = secs_old >= secs_obsolete;
+				}
 				tile_cache.insert(tile->index.hash(), tile, tile->pixmapBytes());
 				return ret;
 			}
diff --git a/libs/map/osm_tile_cache_p.h b/libs/map/osm_tile_cache_p.h
index 8b0a731..ab38841 100644
--- a/libs/map/osm_tile_cache_p.h
+++ b/libs/map/osm_tile_cache_p.h
@@ -46,6 +46,7 @@ public:
 		add_size_b = mb * 1024 * 1024;
 		updateCacheSize();
 	}
+	void setTileObsoleteTime(int secs) { secs_obsolete = secs; }
 
 	void tileDownloaded(OSM::TileIndex index, const QPixmap & pixmap);
 	OSM::TilePixmap getTile(OSM::TileIndex index, QRectF & rect_src);
@@ -67,6 +68,7 @@ private:
 	QDir cache_dir;
 	QWaitCondition cond;
 	QMutex cond_mutex;
+	int secs_obsolete = -1;
 	int fixed_size_b = 0, add_size_b = 0;
 	QQueue<OSM::TilePixmap> queue;
 	QCache<quint64, OSM::TilePixmap> tile_cache;
diff --git a/libs/map/osm_types_p.h b/libs/map/osm_types_p.h
index 778ece8..9783678 100644
--- a/libs/map/osm_types_p.h
+++ b/libs/map/osm_types_p.h
@@ -36,6 +36,7 @@ struct TileIndex {
 struct TilePixmap {
 	TileIndex index;
 	QPixmap pixmap;
+	bool obsolete = false;
 	bool isEmpty() const;
 	int pixmapBytes() const;
 };
diff --git a/libs/piqt/piqt.h b/libs/piqt/piqt.h
index 0ac280c..6b4446c 100644
--- a/libs/piqt/piqt.h
+++ b/libs/piqt/piqt.h
@@ -794,4 +794,104 @@ T piqDeserialize(const QByteArray & data) {
 }
 
 
+/// PICout with Qt
+
+
+inline PICout operator<<(PICout s, const QVariant & v) {
+	s << Q2PIVariant(v);
+	return s;
+}
+
+inline PICout operator<<(PICout s, const QByteArray & v) {
+	s << Q2PIByteArray(v);
+	return s;
+}
+
+inline PICout operator<<(PICout s, const QString & v) {
+	s << Q2PIString(v);
+	return s;
+}
+
+inline PICout operator<<(PICout s, const QStringList & v) {
+	s << Q2PIStringList(v);
+	return s;
+}
+
+#if QT_VERSION_MAJOR == 5
+template<typename T>
+inline PICout operator<<(PICout s, const QVector<T> & v) {
+	s << Q2PIVector(v);
+	return s;
+}
+#endif
+
+template<typename T>
+inline PICout operator<<(PICout s, const QList<T> & v) {
+	s << Q2PIVector(v);
+	return s;
+}
+
+template<typename K, typename T>
+inline PICout operator<<(PICout s, const QMap<K, T> & v) {
+	s << Q2PIMap(v);
+	return s;
+}
+
+inline PICout operator<<(PICout s, const QTime & v) {
+	s << Q2PITime(v);
+	return s;
+}
+
+inline PICout operator<<(PICout s, const QDate & v) {
+	s << Q2PIDate(v);
+	return s;
+}
+
+inline PICout operator<<(PICout s, const QDateTime & v) {
+	s << Q2PIDateTime(v);
+	return s;
+}
+
+inline PICout operator<<(PICout s, const QPoint & v) {
+	s << Q2PIPoint(v);
+	return s;
+}
+
+inline PICout operator<<(PICout s, const QPointF & v) {
+	s << Q2PIPoint(v);
+	return s;
+}
+
+inline PICout operator<<(PICout s, const QLine & v) {
+	s << Q2PILine(v);
+	return s;
+}
+
+inline PICout operator<<(PICout s, const QLineF & v) {
+	s << Q2PILine(v);
+	return s;
+}
+
+inline PICout operator<<(PICout s, const QRect & v) {
+	s << Q2PIRect(v);
+	return s;
+}
+
+inline PICout operator<<(PICout s, const QRectF & v) {
+	s << Q2PIRect(v);
+	return s;
+}
+
+inline PICout operator<<(PICout s, const QColor & v) {
+	s << Q2PIColor(v);
+	return s;
+}
+
+#ifdef PIQT_HAS_GEOPOSITION
+inline PICout operator<<(PICout s, const QGeoCoordinate & v) {
+	s << Q2PIGeoPosition(v);
+	return s;
+}
+#endif
+
 #endif // PIQT_H
diff --git a/utils/mapviewer/mainwindow.cpp b/utils/mapviewer/mainwindow.cpp
index 12b4983..6b5f1f9 100644
--- a/utils/mapviewer/mainwindow.cpp
+++ b/utils/mapviewer/mainwindow.cpp
@@ -7,6 +7,7 @@
 #include "mapitempolygon.h"
 #include "mapitemtext.h"
 #include "osm_geocoding.h"
+#include "piliterals_time.h"
 #include "piqt.h"
 #include "qad_locations.h"
 
@@ -18,6 +19,7 @@
 
 MainWindow::MainWindow(QWidget * parent): EMainWindow(parent), Ui::MainWindow() {
 	setupUi(this);
+	map->setTileObsoleteTime((5_d).toSeconds());
 	session.setFile(QAD::userPath(QAD::ltConfig, "session_mapviewer"));
 	session.addEntry(this);
 	session.load();