diff --git a/src/common/range.h b/src/common/range.h
index 226f889f..c8987f86 100644
--- a/src/common/range.h
+++ b/src/common/range.h
@@ -10,6 +10,11 @@ public:
 	Range() {_min = 0; _max = 0;}
 	Range(int min, int max) : _min(min), _max(max) {}
 
+	bool operator==(const Range &other) const
+	  {return _min == other._min && _max == other._max;}
+	bool operator!=(const Range &other) const
+	  {return _min != other._min || _max != other._max;}
+
 	int min() const {return _min;}
 	int max() const {return _max;}
 	int size() const {return (_max - _min);}
diff --git a/src/map/IMG/gmapdata.cpp b/src/map/IMG/gmapdata.cpp
index c0c0c601..becdd9f9 100644
--- a/src/map/IMG/gmapdata.cpp
+++ b/src/map/IMG/gmapdata.cpp
@@ -94,10 +94,6 @@ bool GMAPData::loadTile(const QDir &dir, bool baseMap)
 		delete tile;
 		return false;
 	}
-	if (baseMap) {
-		tile->markAsBasemap();
-		_baseMap = tile->zooms();
-	}
 
 	double min[2], max[2];
 	min[0] = tile->bounds().left();
@@ -110,6 +106,9 @@ bool GMAPData::loadTile(const QDir &dir, bool baseMap)
 	if (tile->zooms().min() < _zooms.min())
 		_zooms.setMin(tile->zooms().min());
 
+	if (baseMap)
+		_baseMap = tile->zooms();
+
 	return true;
 }
 
diff --git a/src/map/IMG/imgdata.cpp b/src/map/IMG/imgdata.cpp
index b6b22787..112e13ff 100644
--- a/src/map/IMG/imgdata.cpp
+++ b/src/map/IMG/imgdata.cpp
@@ -175,10 +175,8 @@ bool IMGData::createTileTree(const TileMap &tileMap)
 		for (_tileTree.GetFirst(it); !_tileTree.IsNull(it);
 		  _tileTree.GetNext(it)) {
 			VectorTile *tile = _tileTree.GetAt(it);
-			if (tile->zooms().min() == _zooms.min()) {
-				tile->markAsBasemap();
+			if (tile->zooms().min() == _zooms.min())
 				_baseMap = tile->zooms();
-			}
 		}
 	} else {
 		/* Allow some extra zoom out on maps without basemaps, but not too much
diff --git a/src/map/IMG/trefile.cpp b/src/map/IMG/trefile.cpp
index df89d711..533607ca 100644
--- a/src/map/IMG/trefile.cpp
+++ b/src/map/IMG/trefile.cpp
@@ -122,8 +122,6 @@ bool TREFile::init()
 		}
 	}
 
-	_isBaseMap = false;
-
 	return (_firstLevel >= 0);
 }
 
@@ -287,9 +285,9 @@ void TREFile::clear()
 int TREFile::level(int bits, const Range &baseMap)
 {
 	if (!baseMap.isNull()) {
-		if (!_isBaseMap && bits <= baseMap.max())
+		if (zooms() != baseMap && bits <= baseMap.max())
 			return -1;
-		if (_isBaseMap && bits > baseMap.max())
+		if (zooms() == baseMap && bits > baseMap.max())
 			return -1;
 	}
 
diff --git a/src/map/IMG/trefile.h b/src/map/IMG/trefile.h
index e8347238..4161a807 100644
--- a/src/map/IMG/trefile.h
+++ b/src/map/IMG/trefile.h
@@ -25,7 +25,6 @@ public:
 	~TREFile();
 
 	bool init();
-	void markAsBasemap() {_isBaseMap = true;}
 	void clear();
 
 	const RectC &bounds() const {return _bounds;}
@@ -56,7 +55,6 @@ private:
 	quint32 _flags;
 	quint16 _extItemSize;
 	int _firstLevel;
-	bool _isBaseMap;
 
 	QMap<int, SubDivTree*> _subdivs;
 };
diff --git a/src/map/IMG/vectortile.h b/src/map/IMG/vectortile.h
index f8edebca..a0d818ff 100644
--- a/src/map/IMG/vectortile.h
+++ b/src/map/IMG/vectortile.h
@@ -20,7 +20,6 @@ public:
 	}
 
 	bool init();
-	void markAsBasemap() {_tre->markAsBasemap();}
 	void clear();
 
 	const RectC &bounds() const {return _tre->bounds();}