diff --git a/src/map/albersequal.cpp b/src/map/albersequal.cpp
index f93ad20a..ab3fe827 100644
--- a/src/map/albersequal.cpp
+++ b/src/map/albersequal.cpp
@@ -222,3 +222,14 @@ Coordinates AlbersEqual::xy2ll(const PointD &p) const
 
 	return Coordinates(rad2deg(lon), rad2deg(lat));
 }
+
+bool AlbersEqual::operator==(const CT &ct) const
+{
+	const AlbersEqual *other = dynamic_cast<const AlbersEqual*>(&ct);
+	return (other != 0 && _latitudeOrigin == other->_latitudeOrigin
+	  && _longitudeOrigin == other->_longitudeOrigin
+	  && _falseEasting == other->_falseEasting
+	  && _falseNorthing == other->_falseNorthing && _a2 == other->_a2
+	  && _es == other->_es && _rho0 == other->_rho0 && _c == other->_c
+	  && _n == other->_n);
+}
diff --git a/src/map/albersequal.h b/src/map/albersequal.h
index 2f3f10c9..63aefca7 100644
--- a/src/map/albersequal.h
+++ b/src/map/albersequal.h
@@ -13,6 +13,7 @@ public:
 	  double falseEasting, double falseNorthing);
 
 	virtual CT *clone() const {return new AlbersEqual(*this);}
+	virtual bool operator==(const CT &ct) const;
 
 	virtual PointD ll2xy(const Coordinates &c) const;
 	virtual Coordinates xy2ll(const PointD &p) const;
diff --git a/src/map/angularunits.h b/src/map/angularunits.h
index c484e09b..d605c341 100644
--- a/src/map/angularunits.h
+++ b/src/map/angularunits.h
@@ -10,13 +10,15 @@ public:
 	AngularUnits() : _code(0), _f(NAN) {}
 	AngularUnits(int code);
 
+	bool operator==(const AngularUnits &other) const
+	  {return (_code == other._code && _f == other._f);}
+
 	bool isNull() const {return std::isnan(_f);}
 	bool isValid() const {return !std::isnan(_f);}
 
 	double toDegrees(double val) const;
 	double fromDegrees(double val) const;
 
-	friend bool operator==(const AngularUnits &au1, const AngularUnits &au2);
 #ifndef QT_NO_DEBUG
 	friend QDebug operator<<(QDebug dbg, const AngularUnits &au);
 #endif // QT_NO_DEBUG
@@ -25,9 +27,6 @@ private:
 	double _f;
 };
 
-inline bool operator==(const AngularUnits &au1, const AngularUnits &au2)
-  {return (au1._f == au2._f);}
-
 #ifndef QT_NO_DEBUG
 QDebug operator<<(QDebug dbg, const AngularUnits &au);
 #endif // QT_NO_DEBUG
diff --git a/src/map/coordinatesystem.h b/src/map/coordinatesystem.h
index f48788f3..030c0643 100644
--- a/src/map/coordinatesystem.h
+++ b/src/map/coordinatesystem.h
@@ -12,6 +12,9 @@ public:
 	CoordinateSystem(AxisOrder axisOrder) : _axisOrder(axisOrder) {}
 	CoordinateSystem(int code);
 
+	bool operator==(const CoordinateSystem &other) const
+	  {return (_axisOrder == other._axisOrder);}
+
 	bool isNull() const {return (_axisOrder == Unknown);}
 	bool isValid() const {return (_axisOrder != Unknown);}
 
diff --git a/src/map/ct.h b/src/map/ct.h
index 64b2ac65..a5bc8e0a 100644
--- a/src/map/ct.h
+++ b/src/map/ct.h
@@ -9,6 +9,7 @@ public:
 	virtual ~CT() {}
 
 	virtual CT *clone() const = 0;
+	virtual bool operator==(const CT &ct) const = 0;
 
 	virtual PointD ll2xy(const Coordinates &c) const = 0;
 	virtual Coordinates xy2ll(const PointD &p) const = 0;
diff --git a/src/map/gcs.h b/src/map/gcs.h
index 3834ea8e..f58ce882 100644
--- a/src/map/gcs.h
+++ b/src/map/gcs.h
@@ -14,6 +14,12 @@ public:
 	  const AngularUnits &angularUnits) : _datum(datum),
 	  _primeMeridian(primeMeridian), _angularUnits(angularUnits) {}
 
+	bool operator==(const GCS &other) const
+	{
+		return (_datum == other._datum && _primeMeridian == other._primeMeridian
+		  && _angularUnits == other._angularUnits);
+	}
+
 	const PrimeMeridian &primeMeridian() const {return _primeMeridian;}
 	const AngularUnits &angularUnits() const {return _angularUnits;}
 	const Datum &datum() const {return _datum;}
@@ -47,11 +53,6 @@ private:
 	static QList<Entry> _gcss;
 };
 
-inline bool operator==(const GCS &gcs1, const GCS &gcs2)
-  {return (gcs1.datum() == gcs2.datum()
-	&& gcs1.primeMeridian() == gcs2.primeMeridian()
-	&& gcs1.angularUnits() == gcs2.angularUnits());}
-
 #ifndef QT_NO_DEBUG
 QDebug operator<<(QDebug dbg, const GCS &gcs);
 #endif // QT_NO_DEBUG
diff --git a/src/map/imgmap.cpp b/src/map/imgmap.cpp
index c881474f..b3fd02d9 100644
--- a/src/map/imgmap.cpp
+++ b/src/map/imgmap.cpp
@@ -245,11 +245,7 @@ IMGMap::IMGMap(const QString &fileName, QObject *parent)
 		return;
 	}
 
-	// Limit world maps bounds so that the maps can be projected using
-	// the default Web Mercator projection
-	_dataBounds = (_data->bounds().height() > 120)
-	  ? _data->bounds() & OSM::BOUNDS : _data->bounds();
-
+	_dataBounds = _data->bounds() & OSM::BOUNDS;
 	_zoom = _data->zooms().min();
 	updateTransform();
 
@@ -631,7 +627,16 @@ void IMGMap::draw(QPainter *painter, const QRectF &rect, Flags flags)
 
 void IMGMap::setProjection(const Projection &projection)
 {
+	if (projection == _projection)
+		return;
+
 	_projection = projection;
+	// Limit the bounds for some well known Mercator projections
+	// (GARMIN world maps have N/S bounds up to 90/-90!)
+	_dataBounds = (_projection == PCS::pcs(3857)
+	  || _projection == PCS::pcs(3395))
+	  ? _data->bounds() & OSM::BOUNDS : _data->bounds();
+
 	updateTransform();
 	QPixmapCache::clear();
 }
diff --git a/src/map/krovak.cpp b/src/map/krovak.cpp
index 84d5b922..16e03116 100644
--- a/src/map/krovak.cpp
+++ b/src/map/krovak.cpp
@@ -68,3 +68,18 @@ Coordinates Krovak::xy2ll(const PointD &p) const
 
 	return Coordinates(rad2deg(_lambda0 - V/_b), rad2deg(phi));
 }
+
+bool Krovak::operator==(const CT &ct) const
+{
+	const Krovak *other = dynamic_cast<const Krovak*>(&ct);
+	return (other != 0 && _e == other->_e && _a == other->_a && _b == other->_b
+	  && _t0 == other->_t0 && _r0 == other->_r0 && _phiP == other->_phiP
+	  && _cosAlphaC == other->_cosAlphaC && _sinAlphaC == other->_sinAlphaC
+	  && _lambda0 == other->_lambda0 && _fe == other->_fe && _fn == other->_fn);
+}
+
+bool KrovakNE::operator==(const CT &ct) const
+{
+	const KrovakNE *other = dynamic_cast<const KrovakNE*>(&ct);
+	return (other != 0 && _k == other->_k);
+}
diff --git a/src/map/krovak.h b/src/map/krovak.h
index 17bbb983..e66b2fdf 100644
--- a/src/map/krovak.h
+++ b/src/map/krovak.h
@@ -13,6 +13,7 @@ public:
 	  double longitudeOrigin, double falseEasting, double falseNorthing);
 
 	virtual CT *clone() const {return new Krovak(*this);}
+	virtual bool operator==(const CT &ct) const;
 
 	virtual PointD ll2xy(const Coordinates &c) const;
 	virtual Coordinates xy2ll(const PointD &p) const;
@@ -32,6 +33,7 @@ public:
 		longitudeOrigin, falseEasting, falseNorthing) {}
 
 	virtual CT *clone() const {return new KrovakNE(*this);}
+	virtual bool operator==(const CT &ct) const;
 
 	virtual PointD ll2xy(const Coordinates &c) const
 	  {PointD p(_k.ll2xy(c)); return PointD(-p.x(), -p.y());}
diff --git a/src/map/lambertazimuthal.cpp b/src/map/lambertazimuthal.cpp
index da1ad89e..7a0cea44 100644
--- a/src/map/lambertazimuthal.cpp
+++ b/src/map/lambertazimuthal.cpp
@@ -68,3 +68,11 @@ Coordinates LambertAzimuthal::xy2ll(const PointD &p) const
 
 	return Coordinates(rad2deg(lon), rad2deg(lat));
 }
+
+bool LambertAzimuthal::operator==(const CT &ct) const
+{
+	const LambertAzimuthal *other = dynamic_cast<const LambertAzimuthal*>(&ct);
+	return (other != 0 && _lon0 == other->_lon0 && _fn == other->_fn
+	  && _fe == other->_fe && _a == other->_a && _es == other->_es
+	  && _beta0 == other->_beta0 && _rq == other->_rq && _d == other->_d);
+}
diff --git a/src/map/lambertazimuthal.h b/src/map/lambertazimuthal.h
index f7aab623..25a7cd75 100644
--- a/src/map/lambertazimuthal.h
+++ b/src/map/lambertazimuthal.h
@@ -12,6 +12,7 @@ public:
 	  double longitudeOrigin, double falseEasting, double falseNorthing);
 
 	virtual CT *clone() const {return new LambertAzimuthal(*this);}
+	virtual bool operator==(const CT &ct) const;
 
 	virtual PointD ll2xy(const Coordinates &c) const;
 	virtual Coordinates xy2ll(const PointD &p) const;
diff --git a/src/map/lambertconic.cpp b/src/map/lambertconic.cpp
index 30c4ba25..b10cb7fd 100644
--- a/src/map/lambertconic.cpp
+++ b/src/map/lambertconic.cpp
@@ -194,6 +194,16 @@ Coordinates LambertConic1::xy2ll(const PointD &p) const
 	return Coordinates(rad2deg(lon), rad2deg(lat));
 }
 
+bool LambertConic1::operator==(const CT &ct) const
+{
+	const LambertConic1 *other = dynamic_cast<const LambertConic1*>(&ct);
+	return (other != 0 && _longitudeOrigin == other->_longitudeOrigin
+	  && _falseEasting == other->_falseEasting
+	  && _falseNorthing == other->_falseNorthing && _e == other->_e
+	  && _n == other->_n && _rho0 == other->_rho0);
+}
+
+
 LambertConic2::LambertConic2(const Ellipsoid *ellipsoid,
   double standardParallel1, double standardParallel2, double latitudeOrigin,
   double longitudeOrigin, double falseEasting, double falseNorthing)
@@ -264,3 +274,9 @@ Coordinates LambertConic2::xy2ll(const PointD &p) const
 {
 	return _lc1.xy2ll(p);
 }
+
+bool LambertConic2::operator==(const CT &ct) const
+{
+	const LambertConic2 *other = dynamic_cast<const LambertConic2*>(&ct);
+	return (other != 0 && _lc1 == other->_lc1);
+}
diff --git a/src/map/lambertconic.h b/src/map/lambertconic.h
index de1e9685..e8c94d63 100644
--- a/src/map/lambertconic.h
+++ b/src/map/lambertconic.h
@@ -14,6 +14,7 @@ public:
 	  double falseNorthing);
 
 	virtual CT *clone() const {return new LambertConic1(*this);}
+	virtual bool operator==(const CT &ct) const;
 
 	virtual PointD ll2xy(const Coordinates &c) const;
 	virtual Coordinates xy2ll(const PointD &p) const;
@@ -39,6 +40,7 @@ public:
 	   double falseEasting, double falseNorthing);
 
 	virtual CT *clone() const {return new LambertConic2(*this);}
+	virtual bool operator==(const CT &ct) const;
 
 	virtual PointD ll2xy(const Coordinates &c) const;
 	virtual Coordinates xy2ll(const PointD &p) const;
diff --git a/src/map/latlon.h b/src/map/latlon.h
index 06747276..0d4b94ef 100644
--- a/src/map/latlon.h
+++ b/src/map/latlon.h
@@ -10,6 +10,11 @@ public:
 	LatLon(const AngularUnits &au) : _au(au) {}
 
 	virtual CT *clone() const {return new LatLon(*this);}
+	virtual bool operator==(const CT &ct) const
+	{
+		const LatLon *other = dynamic_cast<const LatLon*>(&ct);
+		return (other != 0 && _au == other->_au);
+	}
 
 	virtual PointD ll2xy(const Coordinates &c) const
 	  {return PointD(_au.fromDegrees(c.lon()), _au.fromDegrees(c.lat()));}
diff --git a/src/map/linearunits.h b/src/map/linearunits.h
index 04265f4b..c70d8e69 100644
--- a/src/map/linearunits.h
+++ b/src/map/linearunits.h
@@ -11,6 +11,9 @@ public:
 	LinearUnits() : _f(NAN) {}
 	LinearUnits(int code);
 
+	bool operator==(const LinearUnits &other) const
+	  {return (_f == other._f);}
+
 	bool isNull() const {return std::isnan(_f);}
 	bool isValid() const {return !std::isnan(_f);}
 
@@ -21,7 +24,6 @@ public:
 	PointD fromMeters(const PointD &p) const
 	  {return PointD(p.x() / _f, p.y() /_f);}
 
-	friend bool operator==(const LinearUnits &lu1, const LinearUnits &lu2);
 #ifndef QT_NO_DEBUG
 	friend QDebug operator<<(QDebug dbg, const LinearUnits &lu);
 #endif // QT_NO_DEBUG
@@ -30,9 +32,6 @@ private:
 	double _f;
 };
 
-inline bool operator==(const LinearUnits &lu1, const LinearUnits &lu2)
-  {return (lu1._f == lu2._f);}
-
 #ifndef QT_NO_DEBUG
 QDebug operator<<(QDebug dbg, const LinearUnits &lu);
 #endif // QT_NO_DEBUG
diff --git a/src/map/mercator.cpp b/src/map/mercator.cpp
index dd891c72..6841da51 100644
--- a/src/map/mercator.cpp
+++ b/src/map/mercator.cpp
@@ -121,3 +121,13 @@ Coordinates Mercator::xy2ll(const PointD &p) const
 
 	return Coordinates(rad2deg(lon), rad2deg(lat));
 }
+
+bool Mercator::operator==(const CT &ct) const
+{
+	const Mercator *other = dynamic_cast<const Mercator*>(&ct);
+	return (other != 0 && _a == other->_a && _e == other->_e
+	  && _latitudeOrigin == other->_latitudeOrigin
+	  && _longitudeOrigin == other->_longitudeOrigin
+	  && _falseNorthing == other->_falseNorthing
+	  && _falseEasting == other->_falseEasting);
+}
diff --git a/src/map/mercator.h b/src/map/mercator.h
index 39d0390b..81fd1178 100644
--- a/src/map/mercator.h
+++ b/src/map/mercator.h
@@ -12,6 +12,7 @@ public:
 	  double longitudeOrigin, double falseEasting, double falseNorthing);
 
 	virtual CT *clone() const {return new Mercator(*this);}
+	virtual bool operator==(const CT &ct) const;
 
 	virtual PointD ll2xy(const Coordinates &c) const;
 	virtual Coordinates xy2ll(const PointD &p) const;
diff --git a/src/map/obliquestereographic.cpp b/src/map/obliquestereographic.cpp
index b3add846..775476a0 100644
--- a/src/map/obliquestereographic.cpp
+++ b/src/map/obliquestereographic.cpp
@@ -80,3 +80,13 @@ Coordinates ObliqueStereographic::xy2ll(const PointD &p) const
 	return Coordinates(rad2deg((lambda - _lambda0) / _n + _lambda0),
 	  rad2deg(phi));
 }
+
+bool ObliqueStereographic::operator==(const CT &ct) const
+{
+	const ObliqueStereographic *other
+	  = dynamic_cast<const ObliqueStereographic*>(&ct);
+	return (other != 0 && _es == other->_es && _chi0 == other->_chi0
+	  && _sinChi0 == other->_sinChi0 && _cosChi0 == other->_cosChi0
+	  && _lambda0 == other->_lambda0 && _n == other->_n && _c == other->_c
+	  && _fe == other->_fe && _fn == other->_fn && _twoRk0 == other->_twoRk0);
+}
diff --git a/src/map/obliquestereographic.h b/src/map/obliquestereographic.h
index 429be7dc..9b335628 100644
--- a/src/map/obliquestereographic.h
+++ b/src/map/obliquestereographic.h
@@ -11,7 +11,9 @@ public:
 	ObliqueStereographic(const Ellipsoid *ellipsoid, double latitudeOrigin,
 	  double longitudeOrigin, double scale, double falseEasting,
 	  double falseNorthing);
+
 	virtual CT *clone() const {return new ObliqueStereographic(*this);}
+	virtual bool operator==(const CT &ct) const;
 
 	virtual PointD ll2xy(const Coordinates &c) const;
 	virtual Coordinates xy2ll(const PointD &p) const;
diff --git a/src/map/polarstereographic.cpp b/src/map/polarstereographic.cpp
index 6d790d84..e65933a4 100644
--- a/src/map/polarstereographic.cpp
+++ b/src/map/polarstereographic.cpp
@@ -190,3 +190,14 @@ Coordinates PolarStereographic::xy2ll(const PointD &p) const
 
 	return Coordinates(rad2deg(Longitude), rad2deg(Latitude));
 }
+
+bool PolarStereographic::operator==(const CT &ct) const
+{
+	const PolarStereographic *other
+	  = dynamic_cast<const PolarStereographic*>(&ct);
+	return (other != 0 && _originLatitude == other->_originLatitude
+	  && _originLongitude == other->_originLongitude
+	  && _falseEasting == other->_falseEasting
+	  && _falseNorthing == other->_falseNorthing && _two_a == other->_two_a
+	  && _es == other->_es);
+}
diff --git a/src/map/polarstereographic.h b/src/map/polarstereographic.h
index 7ac606ff..eb25cb39 100644
--- a/src/map/polarstereographic.h
+++ b/src/map/polarstereographic.h
@@ -10,7 +10,9 @@ class PolarStereographic  : public CT
 public:
 	PolarStereographic(const Ellipsoid *ellipsoid, double latitudeOrigin,
 	  double longitudeOrigin, double falseEasting, double falseNorthing);
+
 	virtual CT *clone() const {return new PolarStereographic(*this);}
+	virtual bool operator==(const CT &ct) const;
 
 	virtual PointD ll2xy(const Coordinates &c) const;
 	virtual Coordinates xy2ll(const PointD &p) const;
diff --git a/src/map/projection.cpp b/src/map/projection.cpp
index 1293c1ef..d0d022f8 100644
--- a/src/map/projection.cpp
+++ b/src/map/projection.cpp
@@ -36,9 +36,15 @@ Projection::Method::Method(int id)
 	}
 }
 
-Projection::Projection(const PCS *pcs) : _gcs(pcs->gcs()), _units(pcs->units()),
-	_cs(pcs->coordinateSystem()), _geographic(false)
+Projection::Projection(const PCS *pcs) : _gcs(0), _ct(0), _geographic(false)
 {
+	if (!pcs)
+		return;
+
+	_gcs = pcs->gcs();
+	_units = pcs->units();
+	_cs = pcs->coordinateSystem();
+
 	const Ellipsoid *ellipsoid = _gcs->datum().ellipsoid();
 	const Projection::Setup &setup = pcs->setup();
 
@@ -109,6 +115,8 @@ Projection::Projection(const PCS *pcs) : _gcs(pcs->gcs()), _units(pcs->units()),
 Projection::Projection(const GCS *gcs, const CoordinateSystem &cs)
   : _gcs(gcs), _units(LinearUnits(9001)), _cs(cs), _geographic(true)
 {
+	if (!gcs)
+		return;
 	_ct = new LatLon(gcs->angularUnits());
 }
 
@@ -141,6 +149,15 @@ Projection &Projection::operator=(const Projection &p)
 	return *this;
 }
 
+bool Projection::operator==(const Projection &p) const
+{
+	if (!isValid() || !p.isValid())
+		return false;
+
+	return (*_ct == *p._ct && *_gcs == *p._gcs && _units == p._units
+	  && _cs == p._cs && _geographic == p._geographic);
+}
+
 PointD Projection::ll2xy(const Coordinates &c) const
 {
 	Q_ASSERT(isValid());
diff --git a/src/map/projection.h b/src/map/projection.h
index bcaf4c74..a13e248c 100644
--- a/src/map/projection.h
+++ b/src/map/projection.h
@@ -78,6 +78,7 @@ public:
 	~Projection();
 
 	Projection &operator=(const Projection &p);
+	bool operator==(const Projection &p) const;
 
 	bool isNull() const {return (_gcs == 0 && _ct == 0 && _units.isNull());}
 	bool isValid() const {return !(_gcs == 0 || _ct == 0 || _units.isNull());}
diff --git a/src/map/transversemercator.cpp b/src/map/transversemercator.cpp
index 4edd8944..5cdbbb9f 100644
--- a/src/map/transversemercator.cpp
+++ b/src/map/transversemercator.cpp
@@ -252,3 +252,14 @@ Coordinates TransverseMercator::xy2ll(const PointD &p) const
 
 	return Coordinates(rad2deg(lon), rad2deg(lat));
 }
+
+bool TransverseMercator::operator==(const CT &ct) const
+{
+	const TransverseMercator *other
+	  = dynamic_cast<const TransverseMercator*>(&ct);
+	return (other != 0 && _longitudeOrigin == other->_longitudeOrigin
+	  && _latitudeOrigin == other->_latitudeOrigin && _scale == other->_scale
+	  && _falseEasting == other->_falseEasting
+	  && _falseNorthing == other->_falseNorthing && _a == other->_a
+	  && _es == other->_es);
+}
diff --git a/src/map/transversemercator.h b/src/map/transversemercator.h
index 9e9e2f18..f22ab444 100644
--- a/src/map/transversemercator.h
+++ b/src/map/transversemercator.h
@@ -13,6 +13,7 @@ public:
 	  double falseNorthing);
 
 	virtual CT *clone() const {return new TransverseMercator(*this);}
+	virtual bool operator==(const CT &ct) const;
 
 	virtual PointD ll2xy(const Coordinates &c) const;
 	virtual Coordinates xy2ll(const PointD &p) const;
diff --git a/src/map/webmercator.cpp b/src/map/webmercator.cpp
index 66dd4978..e9e2e306 100644
--- a/src/map/webmercator.cpp
+++ b/src/map/webmercator.cpp
@@ -14,3 +14,9 @@ Coordinates WebMercator::xy2ll(const PointD &p) const
 	return Coordinates(rad2deg(p.x() / WGS84_RADIUS),
 	  rad2deg(2.0 * atan(exp(p.y() / WGS84_RADIUS)) - M_PI_2));
 }
+
+bool WebMercator::operator==(const CT &ct) const
+{
+	const WebMercator *other = dynamic_cast<const WebMercator*>(&ct);
+	return (other != 0);
+}
diff --git a/src/map/webmercator.h b/src/map/webmercator.h
index 3231bc77..7642e4fc 100644
--- a/src/map/webmercator.h
+++ b/src/map/webmercator.h
@@ -7,6 +7,7 @@ class WebMercator : public CT
 {
 public:
 	virtual CT *clone() const {return new WebMercator(*this);}
+	virtual bool operator==(const CT &ct) const;
 
 	virtual PointD ll2xy(const Coordinates &c) const;
 	virtual Coordinates xy2ll(const PointD &p) const;