diff --git a/src/map/IMG/img.cpp b/src/map/IMG/img.cpp
index 9fda3e9a..ec3ae439 100644
--- a/src/map/IMG/img.cpp
+++ b/src/map/IMG/img.cpp
@@ -25,18 +25,6 @@ struct CTX
 	QList<IMG::Point> *points;
 };
 
-#ifndef QT_NO_DEBUG
-static QDebug operator<<(QDebug dbg, const QMap<QString, VectorTile*> &map)
-{
-	dbg.nospace() << "TileMap(";
-	for (QMap<QString, VectorTile*>::const_iterator it = map.constBegin();
-	  it != map.constEnd(); ++it)
-		dbg << "(" << it.key() << ", " << *(*it) << ")";
-	dbg << ")";
-	return dbg.space();
-}
-#endif // QT_NO_DEBUG
-
 IMG::IMG(const QString &fileName) : _file(fileName), _valid(false)
 {
 	if (!_file.open(QFile::ReadOnly)) {
@@ -141,7 +129,6 @@ IMG::IMG(const QString &fileName) : _file(fileName), _valid(false)
 	}
 
 	// Create tile tree
-	QSet<int> bits;
 	for (QMap<QString, VectorTile*>::iterator it = tileMap.begin();
 	  it != tileMap.end(); ++it) {
 		CHECK((*it)->init());
@@ -154,12 +141,7 @@ IMG::IMG(const QString &fileName) : _file(fileName), _valid(false)
 		_tileTree.Insert(min, max, *it);
 
 		_bounds |= (*it)->bounds();
-
-		for (int i = 0; i < (*it)->bits().count(); i++)
-			bits.insert((*it)->bits().at(i));
 	}
-	_bits = bits.toList();
-	qSort(_bits);
 
 	// Read TYP file if any
 	if (!TYPMap.isEmpty()) {
@@ -195,17 +177,9 @@ static bool cb(VectorTile *tile, void *context)
 }
 
 void IMG::objects(const RectC &rect, int bits, QList<Poly> *polygons,
-  QList<Poly> *lines, QList<Point> *points) const
+  QList<Poly> *lines, QList<Point> *points)
 {
-	int mb = _bits.first();
-	for (int i = 0; i < _bits.size(); i++) {
-		if (_bits.at(i) > bits)
-			break;
-		else
-			mb = _bits.at(i);
-	}
-
-	CTX ctx(rect, mb, polygons, lines, points);
+	CTX ctx(rect, bits, polygons, lines, points);
 	double min[2], max[2];
 
 	min[0] = rect.left();
diff --git a/src/map/IMG/img.h b/src/map/IMG/img.h
index 6c168ccb..e2a6deb8 100644
--- a/src/map/IMG/img.h
+++ b/src/map/IMG/img.h
@@ -48,11 +48,12 @@ public:
 	IMG(const QString &fileName);
 	~IMG();
 
+	QString fileName() const {return _file.fileName();}
 	const QString &name() const {return _name;}
 	const RectC &bounds() const {return _bounds;}
-	Range zooms() const {return Range(_bits.first(), _bits.last());}
+
 	void objects(const RectC &rect, int bits, QList<Poly> *polygons,
-	  QList<Poly> *lines, QList<Point> *points) const;
+	  QList<Poly> *lines, QList<Point> *points);
 	const Style &style() const {return _style;}
 
 	bool isValid() const {return _valid;}
@@ -63,11 +64,11 @@ private:
 
 	typedef RTree<VectorTile*, double, 2> TileTree;
 
-	QString fileName() const {return _file.fileName();}
 	int blockSize() const {return _blockSize;}
 	bool readBlock(int blockNum, QByteArray &data);
 	qint64 read(char *data, qint64 maxSize);
 	template<class T> bool readValue(T &val);
+	bool init();
 
 	QFile _file;
 	quint8 _key;
@@ -78,7 +79,6 @@ private:
 
 	QString _name;
 	RectC _bounds;
-	QList<int> _bits;
 	Style _style;
 
 	bool _valid;
diff --git a/src/map/IMG/lblfile.cpp b/src/map/IMG/lblfile.cpp
index 4feac22e..bd933475 100644
--- a/src/map/IMG/lblfile.cpp
+++ b/src/map/IMG/lblfile.cpp
@@ -160,10 +160,8 @@ Label LBLFile::label8b(Handle &hdl, quint32 offset) const
 
 Label LBLFile::label(Handle &hdl, quint32 offset, bool poi)
 {
-	if (!_init) {
-		if (!(_init = init()))
-			return QString();
-	}
+	if (!_size && !init())
+		return QString();
 
 	quint32 labelOffset;
 	if (poi) {
diff --git a/src/map/IMG/lblfile.h b/src/map/IMG/lblfile.h
index cb7b3614..3ae3fd68 100644
--- a/src/map/IMG/lblfile.h
+++ b/src/map/IMG/lblfile.h
@@ -9,7 +9,9 @@ class QTextCodec;
 class LBLFile : public SubFile
 {
 public:
-	LBLFile(IMG *img, quint32 size) : SubFile(img, size), _init(false) {}
+	LBLFile(IMG *img, quint32 size)
+	  : SubFile(img, size), _offset(0), _size(0), _poiOffset(0), _poiSize(0),
+	  _multiplier(0), _encoding(0), _codec(0) {}
 
 	Label label(Handle &hdl, quint32 offset, bool poi = false);
 
@@ -26,8 +28,6 @@ private:
 	quint8 _multiplier;
 	quint8 _encoding;
 	QTextCodec *_codec;
-
-	bool _init;
 };
 
 #endif // LBLFILE_H
diff --git a/src/map/IMG/rgnfile.cpp b/src/map/IMG/rgnfile.cpp
index f2d3c123..bc3b2a87 100644
--- a/src/map/IMG/rgnfile.cpp
+++ b/src/map/IMG/rgnfile.cpp
@@ -404,10 +404,8 @@ void RGNFile::objects(const RectC &rect, const SubDiv *subdiv, LBLFile *lbl,
 {
 	Handle rgnHdl, lblHdl, netHdl;
 
-	if (!_init) {
-		if (!(_init = init()))
-			return;
-	}
+	if (!_size && !init())
+		return;
 
 	QVector<RGNFile::Segment> seg(segments(rgnHdl, subdiv));
 	for (int i = 0; i < seg.size(); i++) {
@@ -438,10 +436,8 @@ void RGNFile::extObjects(const RectC &rect, const SubDiv *subdiv, LBLFile *lbl,
 {
 	Handle rgnHdl, lblHdl;
 
-	if (!_init) {
-		if (!(_init = init()))
-			return;
-	}
+	if (!_size && !init())
+		return;
 
 	if (polygons && subdiv->polygonsOffset() != subdiv->polygonsEnd()) {
 		quint32 start = _polygonsOffset + subdiv->polygonsOffset();
diff --git a/src/map/IMG/rgnfile.h b/src/map/IMG/rgnfile.h
index 875c7c99..70942052 100644
--- a/src/map/IMG/rgnfile.h
+++ b/src/map/IMG/rgnfile.h
@@ -11,7 +11,10 @@ class NETFile;
 class RGNFile : public SubFile
 {
 public:
-	RGNFile(IMG *img, quint32 size) : SubFile(img, size), _init(false) {}
+	RGNFile(IMG *img, quint32 size)
+	  : SubFile(img, size), _offset(0), _size(0), _polygonsOffset(0),
+	  _polygonsSize(), _linesOffset(), _linesSize(), _pointsOffset(),
+	  _pointsSize() {}
 
 	void objects(const RectC &rect, const SubDiv *subdiv, LBLFile *lbl,
 	  NETFile *net, QList<IMG::Poly> *polygons, QList<IMG::Poly> *lines,
@@ -96,8 +99,6 @@ private:
 	quint32 _linesSize;
 	quint32 _pointsOffset;
 	quint32 _pointsSize;
-
-	bool _init;
 };
 
 #ifndef QT_NO_DEBUG
diff --git a/src/map/IMG/trefile.cpp b/src/map/IMG/trefile.cpp
index bbe73dd9..ae6f42f1 100644
--- a/src/map/IMG/trefile.cpp
+++ b/src/map/IMG/trefile.cpp
@@ -9,16 +9,6 @@ struct MapLevel {
 	quint16 subdivs;
 };
 
-#ifndef QT_NO_DEBUG
-static QDebug operator<<(QDebug dbg, const MapLevel &ml)
-{
-	bool inherited = ml.level & 0x80 ? true : false;
-	dbg.nospace() << "MapLevel(" << (ml.level & 0x7F) << ", " << inherited
-	  << ", " << ml.bits << ", " << ml.subdivs << ")";
-	return dbg.space();
-}
-#endif // QT_NO_DEBUG
-
 static void unlock(quint8 *dst, const quint8 *src, quint32 size, quint32 key)
 {
 	static const unsigned char shuf[] = {
@@ -67,12 +57,6 @@ TREFile::~TREFile()
 bool TREFile::init()
 {
 	Handle hdl;
-	quint8 locked;
-	quint16 hdrLen;
-
-	if (!(isValid() && seek(hdl, 0) && readUInt16(hdl, hdrLen)
-	  && seek(hdl, 0x0D) && readByte(hdl, locked)))
-		return false;
 
 	// Tile bounds
 	qint32 north, east, south, west;
@@ -82,9 +66,23 @@ bool TREFile::init()
 	_bounds = RectC(Coordinates(toWGS84(west), toWGS84(north)),
 	  Coordinates(toWGS84(east), toWGS84(south)));
 
+	return true;
+}
+
+bool TREFile::init2()
+{
+	Handle hdl;
+	quint8 locked;
+	quint16 hdrLen;
+
+	if (!(seek(hdl, 0) && readUInt16(hdl, hdrLen)
+	  && seek(hdl, 0x0D) && readByte(hdl, locked)))
+		return false;
+
 	quint32 levelsOffset, levelsSize, subdivOffset, subdivSize;
-	if (!(readUInt32(hdl, levelsOffset) && readUInt32(hdl, levelsSize)
-	  && readUInt32(hdl, subdivOffset) && readUInt32(hdl, subdivSize)))
+	if (!(seek(hdl, 0x21) && readUInt32(hdl, levelsOffset)
+	  && readUInt32(hdl, levelsSize) && readUInt32(hdl, subdivOffset)
+	  && readUInt32(hdl, subdivSize)))
 		return false;
 
 	quint32 extOffset, extSize = 0;
@@ -199,9 +197,27 @@ bool TREFile::init()
 		}
 	}
 
+	_levels = _subdivs.keys();
+
 	return true;
 }
 
+int TREFile::level(int bits)
+{
+	if (_levels.isEmpty() && !init2())
+		return -1;
+
+	int l = _levels.first();
+	for (int i = 0; i < _levels.size(); i++) {
+		if (_levels.at(i) > bits)
+			break;
+		else
+			l = _levels.at(i);
+	}
+
+	return l;
+}
+
 static bool cb(SubDiv *subdiv, void *context)
 {
 	QList<SubDiv*> *list = (QList<SubDiv*>*)context;
@@ -209,9 +225,10 @@ static bool cb(SubDiv *subdiv, void *context)
 	return true;
 }
 
-QList<SubDiv*> TREFile::subdivs(const RectC &rect, int bits) const
+QList<SubDiv*> TREFile::subdivs(const RectC &rect, int bits)
 {
 	QList<SubDiv*> list;
+	SubDivTree *tree = _subdivs.value(level(bits));
 	double min[2], max[2];
 
 	min[0] = rect.left();
@@ -219,7 +236,8 @@ QList<SubDiv*> TREFile::subdivs(const RectC &rect, int bits) const
 	max[0] = rect.right();
 	max[1] = rect.top();
 
-	_subdivs.value(bits)->Search(min, max, cb, &list);
+	if (tree)
+		tree->Search(min, max, cb, &list);
 
 	return list;
 }
diff --git a/src/map/IMG/trefile.h b/src/map/IMG/trefile.h
index 12a8581b..07548cb1 100644
--- a/src/map/IMG/trefile.h
+++ b/src/map/IMG/trefile.h
@@ -19,18 +19,19 @@ public:
 	bool init();
 
 	const RectC &bounds() const {return _bounds;}
-	const QList<int> bits() const {return _subdivs.keys();}
-
-	QList<SubDiv*> subdivs(const RectC &rect, int bits) const;
+	QList<SubDiv*> subdivs(const RectC &rect, int bits);
 
 private:
 	typedef RTree<SubDiv*, double, 2> SubDivTree;
 
+	bool init2();
+	int level(int bits);
 	bool parsePoly(Handle hdl, quint32 pos, const QMap<int, int> &level2bits,
 	  QMap<quint32, int> &map);
 	bool parsePoints(Handle hdl, quint32 pos, const QMap<int, int> &level2bits);
 
 	RectC _bounds;
+	QList<int> _levels;
 	QMap<int, SubDivTree*> _subdivs;
 };
 
diff --git a/src/map/IMG/vectortile.cpp b/src/map/IMG/vectortile.cpp
index b640c7d6..d2146316 100644
--- a/src/map/IMG/vectortile.cpp
+++ b/src/map/IMG/vectortile.cpp
@@ -38,7 +38,8 @@ SubFile *VectorTile::addFile(IMG *img, SubFile::Type type, quint32 size)
 
 bool VectorTile::init()
 {
-	if (!(_tre && _tre->init() && _rgn && _rgn->isValid()))
+	if (!(_tre && _tre->isValid() && _tre->init() && _rgn
+	  && _rgn->isValid()))
 		return false;
 	if (_lbl && !_lbl->isValid())
 		return false;
diff --git a/src/map/IMG/vectortile.h b/src/map/IMG/vectortile.h
index 603f0310..20fc24b3 100644
--- a/src/map/IMG/vectortile.h
+++ b/src/map/IMG/vectortile.h
@@ -16,7 +16,6 @@ public:
 	bool init();
 
 	const RectC &bounds() const {return _tre->bounds();}
-	const QList<int> bits() const {return _tre->bits();}
 
 	SubFile *file(SubFile::Type type);
 	SubFile *addFile(IMG *img, SubFile::Type type, quint32 size);
diff --git a/src/map/imgmap.cpp b/src/map/imgmap.cpp
index a9af603a..4d6c45cc 100644
--- a/src/map/imgmap.cpp
+++ b/src/map/imgmap.cpp
@@ -159,15 +159,14 @@ static int minShieldZoom(Label::Shield::Type type)
 
 
 IMGMap::IMGMap(const QString &fileName, QObject *parent)
-  : Map(parent), _fileName(fileName), _img(fileName),
-  _projection(PCS::pcs(3857)), _valid(false)
+  : Map(parent), _img(fileName), _projection(PCS::pcs(3857)), _valid(false)
 {
 	if (!_img.isValid()) {
 		_errorString = _img.errorString();
 		return;
 	}
 
-	_zooms = Range(qMin(_img.zooms().min(), 12), 28);
+	_zooms = Range(12, 28);
 	_zoom = _zooms.min();
 
 	updateTransform();
@@ -489,7 +488,7 @@ void IMGMap::draw(QPainter *painter, const QRectF &rect, Flags flags)
 		for (int j = 0; j < height; j++) {
 			QPixmap pm;
 			QPoint ttl(tl.x() + i * TILE_SIZE, tl.y() + j * TILE_SIZE);
-			QString key = _fileName + "-" + QString::number(_zoom) + "_"
+			QString key = _img.fileName() + "-" + QString::number(_zoom) + "_"
 			  + QString::number(ttl.x()) + "_" + QString::number(ttl.y());
 			if (QPixmapCache::find(key, pm))
 				painter->drawPixmap(ttl, pm);
diff --git a/src/map/imgmap.h b/src/map/imgmap.h
index 049d8c95..73a14bd2 100644
--- a/src/map/imgmap.h
+++ b/src/map/imgmap.h
@@ -51,7 +51,6 @@ private:
 	  QList<TextItem*> &textItems);
 	void processPoints(QList<IMG::Point> &points, QList<TextItem*> &textItems);
 
-	QString _fileName;
 	IMG _img;
 	int _zoom;
 	Range _zooms;