diff --git a/src/Environment/environment_mgr.cxx b/src/Environment/environment_mgr.cxx
index 3182f1159..c6451eef1 100644
--- a/src/Environment/environment_mgr.cxx
+++ b/src/Environment/environment_mgr.cxx
@@ -42,6 +42,7 @@
 #include "precipitation_mgr.hxx"
 #include "ridge_lift.hxx"
 #include "terrainsampler.hxx"
+#include "Airports/simple.hxx"
 
 class SGSky;
 extern SGSky *thesky;
@@ -49,8 +50,11 @@ extern SGSky *thesky;
 FGEnvironmentMgr::FGEnvironmentMgr () :
   _environment(new FGEnvironment()),
   fgClouds(new FGClouds()),
+  _cloudLayersDirty(true),
   _altitudeNode(fgGetNode("/position/altitude-ft", true)),
-  _cloudLayersDirty(true)
+  _longitude_n(fgGetNode( "/position/longitude-deg", true )),
+  _latitude_n( fgGetNode( "/position/latitude-deg", true )),
+  _positionTimeToLive(0.0)
 {
   set_subsystem("controller", Environment::LayerInterpolateController::createInstance( fgGetNode("/environment/config", true ) ));
   set_subsystem("realwx", Environment::RealWxController::createInstance( fgGetNode("/environment/realwx", true ) ), 1.0 );
@@ -93,6 +97,7 @@ FGEnvironmentMgr::init ()
 {
   SG_LOG( SG_GENERAL, SG_INFO, "Initializing environment subsystem");
   SGSubsystemGroup::init();
+  fgClouds->Init();
 }
 
 void
@@ -107,77 +112,77 @@ FGEnvironmentMgr::bind ()
 {
   SGSubsystemGroup::bind();
   _environment->Tie( fgGetNode("/environment", true ) );
-  
+
   _tiedProperties.setRoot( fgGetNode( "/environment", true ) );
 
   _tiedProperties.Tie( "effective-visibility-m", thesky,
-       &SGSky::get_visibility );
+          &SGSky::get_visibility );
 
   _tiedProperties.Tie("rebuild-layers", fgClouds,
-      &FGClouds::get_update_event,
-      &FGClouds::set_update_event);
+          &FGClouds::get_update_event,
+          &FGClouds::set_update_event);
 
   _tiedProperties.Tie("turbulence/use-cloud-turbulence", &sgEnviro,
-      &SGEnviro::get_turbulence_enable_state,
-      &SGEnviro::set_turbulence_enable_state);
+          &SGEnviro::get_turbulence_enable_state,
+          &SGEnviro::set_turbulence_enable_state);
 
   for (int i = 0; i < MAX_CLOUD_LAYERS; i++) {
-    SGPropertyNode_ptr layerNode = fgGetNode("/environment/clouds",true)->getChild("layer", i, true );
+      SGPropertyNode_ptr layerNode = fgGetNode("/environment/clouds",true)->getChild("layer", i, true );
 
-    _tiedProperties.Tie( layerNode->getNode("span-m",true), this, i, 
-	  &FGEnvironmentMgr::get_cloud_layer_span_m,
-	  &FGEnvironmentMgr::set_cloud_layer_span_m);
+      _tiedProperties.Tie( layerNode->getNode("span-m",true), this, i,
+              &FGEnvironmentMgr::get_cloud_layer_span_m,
+              &FGEnvironmentMgr::set_cloud_layer_span_m);
 
-    _tiedProperties.Tie( layerNode->getNode("elevation-ft",true), this, i, 
-	  &FGEnvironmentMgr::get_cloud_layer_elevation_ft,
-	  &FGEnvironmentMgr::set_cloud_layer_elevation_ft);
+      _tiedProperties.Tie( layerNode->getNode("elevation-ft",true), this, i,
+              &FGEnvironmentMgr::get_cloud_layer_elevation_ft,
+              &FGEnvironmentMgr::set_cloud_layer_elevation_ft);
 
-    _tiedProperties.Tie( layerNode->getNode("thickness-ft",true), this, i, 
-	  &FGEnvironmentMgr::get_cloud_layer_thickness_ft,
-	  &FGEnvironmentMgr::set_cloud_layer_thickness_ft);
+      _tiedProperties.Tie( layerNode->getNode("thickness-ft",true), this, i,
+              &FGEnvironmentMgr::get_cloud_layer_thickness_ft,
+              &FGEnvironmentMgr::set_cloud_layer_thickness_ft);
 
-    _tiedProperties.Tie( layerNode->getNode("transition-ft",true), this, i, 
-	  &FGEnvironmentMgr::get_cloud_layer_transition_ft,
-	  &FGEnvironmentMgr::set_cloud_layer_transition_ft);
+      _tiedProperties.Tie( layerNode->getNode("transition-ft",true), this, i,
+              &FGEnvironmentMgr::get_cloud_layer_transition_ft,
+              &FGEnvironmentMgr::set_cloud_layer_transition_ft);
 
-    _tiedProperties.Tie( layerNode->getNode("coverage",true), this, i, 
-	  &FGEnvironmentMgr::get_cloud_layer_coverage,
-	  &FGEnvironmentMgr::set_cloud_layer_coverage);
+      _tiedProperties.Tie( layerNode->getNode("coverage",true), this, i,
+              &FGEnvironmentMgr::get_cloud_layer_coverage,
+              &FGEnvironmentMgr::set_cloud_layer_coverage);
 
-    _tiedProperties.Tie( layerNode->getNode("coverage-type",true), this, i, 
-	  &FGEnvironmentMgr::get_cloud_layer_coverage_type,
-	  &FGEnvironmentMgr::set_cloud_layer_coverage_type);
+      _tiedProperties.Tie( layerNode->getNode("coverage-type",true), this, i,
+              &FGEnvironmentMgr::get_cloud_layer_coverage_type,
+              &FGEnvironmentMgr::set_cloud_layer_coverage_type);
 
-    _tiedProperties.Tie( layerNode->getNode( "visibility-m",true), this, i,
-        &FGEnvironmentMgr::get_cloud_layer_visibility_m,
-        &FGEnvironmentMgr::set_cloud_layer_visibility_m);
+      _tiedProperties.Tie( layerNode->getNode( "visibility-m",true), this, i,
+              &FGEnvironmentMgr::get_cloud_layer_visibility_m,
+              &FGEnvironmentMgr::set_cloud_layer_visibility_m);
 
-    _tiedProperties.Tie( layerNode->getNode( "alpha",true), this, i,
-        &FGEnvironmentMgr::get_cloud_layer_maxalpha,
-        &FGEnvironmentMgr::set_cloud_layer_maxalpha);
+      _tiedProperties.Tie( layerNode->getNode( "alpha",true), this, i,
+              &FGEnvironmentMgr::get_cloud_layer_maxalpha,
+              &FGEnvironmentMgr::set_cloud_layer_maxalpha);
   }
 
   _tiedProperties.setRoot( fgGetNode("/sim/rendering", true ) );
 
   _tiedProperties.Tie( "clouds3d-enable", fgClouds,
-	  &FGClouds::get_3dClouds,
-	  &FGClouds::set_3dClouds);
+          &FGClouds::get_3dClouds,
+          &FGClouds::set_3dClouds);
 
   _tiedProperties.Tie( "clouds3d-density", thesky,
-	  &SGSky::get_3dCloudDensity,
-	  &SGSky::set_3dCloudDensity);
+          &SGSky::get_3dCloudDensity,
+          &SGSky::set_3dCloudDensity);
 
   _tiedProperties.Tie("clouds3d-vis-range", thesky,
-        &SGSky::get_3dCloudVisRange,
-        &SGSky::set_3dCloudVisRange);
-  
+          &SGSky::get_3dCloudVisRange,
+          &SGSky::set_3dCloudVisRange);
+
   _tiedProperties.Tie("precipitation-enable", &sgEnviro,
-	  &SGEnviro::get_precipitation_enable_state, 
-	  &SGEnviro::set_precipitation_enable_state);
+          &SGEnviro::get_precipitation_enable_state,
+          &SGEnviro::set_precipitation_enable_state);
 
   _tiedProperties.Tie("lightning-enable", &sgEnviro,
-      &SGEnviro::get_lightning_enable_state,
-      &SGEnviro::set_lightning_enable_state);
+          &SGEnviro::get_lightning_enable_state,
+          &SGEnviro::set_lightning_enable_state);
 
   sgEnviro.config(fgGetNode("/sim/rendering/precipitation"));
 }
@@ -194,15 +199,42 @@ void
 FGEnvironmentMgr::update (double dt)
 {
   SGSubsystemGroup::update(dt);
-  
+
   _environment->set_elevation_ft( _altitudeNode->getDoubleValue() );
 
   simgear::Particles::setWindFrom( _environment->get_wind_from_heading_deg(),
-				   _environment->get_wind_speed_kt() );
+                                   _environment->get_wind_speed_kt() );
   if( _cloudLayersDirty ) {
     _cloudLayersDirty = false;
     fgClouds->set_update_event( fgClouds->get_update_event()+1 );
   }
+
+  _positionTimeToLive -= dt;
+  if( _positionTimeToLive <= 0.0 )
+  {
+      // update closest airport information
+      _positionTimeToLive = 30.0;
+
+      SG_LOG(SG_ALL, SG_INFO, "FGEnvironmentMgr::update: updating closest airport");
+
+      SGGeod pos = SGGeod::fromDeg(_longitude_n->getDoubleValue(),
+                                   _latitude_n->getDoubleValue());
+
+      FGAirport * nearestAirport = FGAirport::findClosest(pos, 100.0);
+      if( nearestAirport == NULL )
+      {
+          SG_LOG(SG_ALL,SG_WARN,"FGEnvironmentMgr::update: No airport within 100NM range");
+      }
+      else
+      {
+          const string currentId = fgGetString("/sim/airport/closest-airport-id", "");
+          if (currentId != nearestAirport->ident())
+          {
+              fgSetString("/sim/airport/closest-airport-id",
+                      nearestAirport->ident().c_str());
+          }
+      }
+  }
 }
 
 FGEnvironment
@@ -318,31 +350,31 @@ FGEnvironmentMgr::get_cloud_layer_coverage_type (int index) const
   return thesky->get_cloud_layer(index)->getCoverage();
 }
 
-double 
+double
 FGEnvironmentMgr::get_cloud_layer_visibility_m (int index) const
 {
     return thesky->get_cloud_layer(index)->getVisibility_m();
 }
 
-void 
+void
 FGEnvironmentMgr::set_cloud_layer_visibility_m (int index, double visibility_m)
 {
     thesky->get_cloud_layer(index)->setVisibility_m(visibility_m);
 }
 
-double 
+double
 FGEnvironmentMgr::get_cloud_layer_maxalpha (int index ) const
 {
     return thesky->get_cloud_layer(index)->getMaxAlpha();
 }
 
-void 
+void
 FGEnvironmentMgr::set_cloud_layer_maxalpha (int index, double maxalpha)
 {
     thesky->get_cloud_layer(index)->setMaxAlpha(maxalpha);
 }
 
-void 
+void
 FGEnvironmentMgr::set_cloud_layer_coverage_type (int index, int type )
 {
   if( type < 0 || type >= SGCloudLayer::SG_MAX_CLOUD_COVERAGES ) {
diff --git a/src/Environment/environment_mgr.hxx b/src/Environment/environment_mgr.hxx
index e6041f813..67d929ec8 100644
--- a/src/Environment/environment_mgr.hxx
+++ b/src/Environment/environment_mgr.hxx
@@ -94,8 +94,11 @@ private:
 
   FGEnvironment * _environment;	// always the same, for now
   FGClouds *fgClouds;
-  SGPropertyNode_ptr _altitudeNode;
   bool _cloudLayersDirty;
+  SGPropertyNode_ptr _altitudeNode;
+  SGPropertyNode_ptr _longitude_n;
+  SGPropertyNode_ptr _latitude_n;
+  double _positionTimeToLive;
   simgear::TiedPropertyList _tiedProperties;
 };
 
diff --git a/src/Environment/fgclouds.cxx b/src/Environment/fgclouds.cxx
index f5a531382..c57c4ee1d 100644
--- a/src/Environment/fgclouds.cxx
+++ b/src/Environment/fgclouds.cxx
@@ -33,6 +33,7 @@
 #include <simgear/environment/visual_enviro.hxx>
 #include <simgear/scene/sky/cloudfield.hxx>
 #include <simgear/scene/sky/newcloud.hxx>
+#include <simgear/structure/commands.hxx>
 #include <simgear/math/sg_random.h>
 #include <simgear/props/props_io.hxx>
 
@@ -47,12 +48,13 @@ extern SGSky *thesky;
 
 FGClouds::FGClouds() :
     snd_lightning(0),
-    clouds_3d_enabled(false)
+    clouds_3d_enabled(false),
+    index(0)
 {
 	update_event = 0;
 }
 
-FGClouds::~FGClouds() 
+FGClouds::~FGClouds()
 {
 }
 
@@ -65,7 +67,7 @@ void FGClouds::set_update_event(int count) {
 	buildCloudLayers();
 }
 
-void FGClouds::init(void) {
+void FGClouds::Init(void) {
 	if( snd_lightning == NULL ) {
 		snd_lightning = new SGSoundSample("Sounds/thunder.wav", SGPath());
 		snd_lightning->set_max_dist(7000.0f);
@@ -75,6 +77,10 @@ void FGClouds::init(void) {
 		sgr->add( snd_lightning, "thunder" );
 		sgEnviro.set_sampleGroup( sgr );
 	}
+
+	globals->get_commands()->addCommand("add-cloud", do_add_3Dcloud);
+	globals->get_commands()->addCommand("del-cloud", do_delete_3Dcloud);
+	globals->get_commands()->addCommand("move-cloud", do_move_3Dcloud);
 }
 
 // Build an invidual cloud. Returns the extents of the cloud for coverage calculations
@@ -101,7 +107,10 @@ double FGClouds::buildCloud(SGPropertyNode *cloud_def_root, SGPropertyNode *box_
 	double x = sg_random() * SGCloudField::fieldSize - (SGCloudField::fieldSize / 2.0);
 	double y = sg_random() * SGCloudField::fieldSize - (SGCloudField::fieldSize / 2.0);
 	double z = grid_z_rand * (sg_random() - 0.5);
-		
+
+	float lon = fgGetNode("/position/longitude-deg", false)->getFloatValue();
+	float lat = fgGetNode("/position/latitude-deg", false)->getFloatValue();
+
 	SGVec3f pos(x,y,z);
 
 	for(int i = 0; i < box_def->nChildren() ; i++) {
@@ -111,7 +120,7 @@ double FGClouds::buildCloud(SGPropertyNode *cloud_def_root, SGPropertyNode *box_
 			string type = abox->getStringValue("type", "cu-small");
 			cld_def = cloud_def_root->getChild(type.c_str());
 			if ( !cld_def ) return 0.0;
-			
+
 			double w = abox->getDoubleValue("width", 1000.0);
 			double h = abox->getDoubleValue("height", 1000.0);
 			int hdist = abox->getIntValue("hdist", 1);
@@ -147,38 +156,10 @@ double FGClouds::buildCloud(SGPropertyNode *cloud_def_root, SGPropertyNode *box_
 				z = h * z + pos[2]; // Up/Down. pos[2] is the cloudbase
 
 				SGVec3f newpos = SGVec3f(x, y, z);
+				SGNewCloud cld = SGNewCloud(texture_root, cld_def);
 
-				double min_width = cld_def->getDoubleValue("min-cloud-width-m", 500.0);
-				double max_width = cld_def->getDoubleValue("max-cloud-width-m", 1000.0);
-				double min_height = cld_def->getDoubleValue("min-cloud-height-m", min_width);
-				double max_height = cld_def->getDoubleValue("max-cloud-height-m", max_width);
-				double min_sprite_width = cld_def->getDoubleValue("min-sprite-width-m", 200.0);
-				double max_sprite_width = cld_def->getDoubleValue("max-sprite-width-m", min_sprite_width);
-				double min_sprite_height = cld_def->getDoubleValue("min-sprite-height-m", min_sprite_width);
-				double max_sprite_height = cld_def->getDoubleValue("max-sprite-height-m", max_sprite_width);
-				int num_sprites = cld_def->getIntValue("num-sprites", 20);
-				int num_textures_x = cld_def->getIntValue("num-textures-x", 1);
-				int num_textures_y = cld_def->getIntValue("num-textures-y", 1);
-				double bottom_shade = cld_def->getDoubleValue("bottom-shade", 1.0);
-				string texture = cld_def->getStringValue("texture", "cu.png");
-
-				SGNewCloud cld = 
-					SGNewCloud(type,
-						texture_root, 
-						texture, 
-						min_width, 
-						max_width, 
-						min_height,
-						max_height,
-						min_sprite_width,
-						max_sprite_width,
-						min_sprite_height,
-						max_sprite_height,
-						bottom_shade,
-						num_sprites,
-						num_textures_x,
-						num_textures_y);
-				layer->addCloud(newpos, cld.genCloud());
+				//layer->addCloud(newpos, cld.genCloud());
+				layer->addCloud(lon, lat, z, x, y, index++, cld.genCloud());
 			}
 		}
 	}
@@ -266,7 +247,6 @@ void FGClouds::buildLayer(int iLayer, const string& name, double coverage) {
 				break;
 			}
 		}
-		
 	}
 
 	// Now we've built any clouds, enable them and set the density (coverage)
@@ -335,7 +315,7 @@ void FGClouds::buildCloudLayers(void) {
 					layer_type = "sc";
 			}
 		}
-	
+
 		cloud_root->setStringValue("layer-type",layer_type);
 		buildLayer(iLayer, layer_type, coverage_norm);
 	}
@@ -349,8 +329,88 @@ void FGClouds::set_3dClouds(bool enable)
 	}
 }
 
-bool FGClouds::get_3dClouds() const 
+bool FGClouds::get_3dClouds() const
 {
 	return clouds_3d_enabled;
 }
 
+/**
+ * Adds a 3D cloud to a cloud layer.
+ *
+ * Property arguments
+ * layer - the layer index to add this cloud to. (Defaults to 0)
+ * index - the index for this cloud (to be used later)
+ * lon/lat/alt - the position for the cloud
+ * (Various) - cloud definition properties. See README.3DClouds
+ *
+ */
+ static bool
+ do_add_3Dcloud (const SGPropertyNode *arg)
+ {
+   int l = arg->getIntValue("layer", 0);
+   int index = arg->getIntValue("index", 0);
+
+   SGPath texture_root = globals->get_fg_root();
+	 texture_root.append("Textures");
+	 texture_root.append("Sky");
+
+	 float lon = arg->getFloatValue("lon-deg", 0.0f);
+	 float lat = arg->getFloatValue("lat-deg", 0.0f);
+	 float alt = arg->getFloatValue("alt-ft",  0.0f);
+	 float x   = arg->getFloatValue("x-offset-m",  0.0f);
+	 float y   = arg->getFloatValue("y-offset-m",  0.0f);
+
+
+   SGCloudField *layer = thesky->get_cloud_layer(l)->get_layer3D();
+   SGNewCloud cld = SGNewCloud(texture_root, arg);
+	 bool success = layer->addCloud(lon, lat, alt, x, y, index, cld.genCloud());
+
+   // Adding a 3D cloud immediately makes this layer 3D.
+   thesky->get_cloud_layer(l)->set_enable3dClouds(true);
+
+   return success;
+ }
+
+ /**
+  * Removes a 3D cloud from a cloud layer
+  *
+  * Property arguments
+  *
+  * layer - the layer index to remove this cloud from. (defaults to 0)
+  * index - the cloud index
+  *
+  */
+ static bool
+ do_delete_3Dcloud (const SGPropertyNode *arg)
+ {
+   int l = arg->getIntValue("layer", 0);
+   int i = arg->getIntValue("index", 0);
+
+   SGCloudField *layer = thesky->get_cloud_layer(l)->get_layer3D();
+	 return layer->deleteCloud(i);
+ }
+
+/**
+ * Move a cloud within a 3D layer
+ *
+ * Property arguments
+ * layer - the layer index to add this cloud to. (Defaults to 0)
+ * index - the cloud index to move.
+ * lon/lat/alt - the position for the cloud
+ *
+ */
+ static bool
+ do_move_3Dcloud (const SGPropertyNode *arg)
+ {
+   int l = arg->getIntValue("layer", 0);
+   int i = arg->getIntValue("index", 0);
+
+	 float lon = arg->getFloatValue("lon-deg", 0.0f);
+	 float lat = arg->getFloatValue("lat-deg", 0.0f);
+	 float alt = arg->getFloatValue("alt-ft",  0.0f);
+	 float x   = arg->getFloatValue("x-offset-m",  0.0f);
+	 float y   = arg->getFloatValue("y-offset-m",  0.0f);
+
+   SGCloudField *layer = thesky->get_cloud_layer(l)->get_layer3D();
+	 return layer->repositionCloud(i, lon, lat, alt, x, y);
+ }
diff --git a/src/Environment/fgclouds.hxx b/src/Environment/fgclouds.hxx
index 34ac595e3..9d26419ff 100644
--- a/src/Environment/fgclouds.hxx
+++ b/src/Environment/fgclouds.hxx
@@ -47,17 +47,24 @@ private:
 	int update_event;
 	SGSoundSample *snd_lightning;
 	bool clouds_3d_enabled;
+  int index;
 
 public:
 	FGClouds();
 	~FGClouds();
 
-	void init(void);
+	void Init(void);
 
 	int get_update_event(void) const;
 	void set_update_event(int count);
 	bool get_3dClouds() const;
 	void set_3dClouds(bool enable);
+
 };
 
+static bool do_delete_3Dcloud (const SGPropertyNode *arg);
+static bool do_move_3Dcloud (const SGPropertyNode *arg);
+static bool do_add_3Dcloud (const SGPropertyNode *arg);
+
 #endif // _FGCLOUDS_HXX
+
diff --git a/src/FDM/JSBSim/math/FGLocation.h b/src/FDM/JSBSim/math/FGLocation.h
index 23b3845e6..c60e8ea2e 100644
--- a/src/FDM/JSBSim/math/FGLocation.h
+++ b/src/FDM/JSBSim/math/FGLocation.h
@@ -48,7 +48,7 @@ INCLUDES
 DEFINITIONS
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
-#define ID_LOCATION "$Id: FGLocation.h,v 1.25 2010/09/18 22:47:24 jberndt Exp $"
+#define ID_LOCATION "$Id: FGLocation.h,v 1.27 2010/11/29 12:33:58 jberndt Exp $"
 
 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 FORWARD DECLARATIONS
@@ -142,14 +142,14 @@ CLASS DOCUMENTATION
     @see W. C. Durham "Aircraft Dynamics & Control", section 2.2
 
     @author Mathias Froehlich
-    @version $Id: FGLocation.h,v 1.25 2010/09/18 22:47:24 jberndt Exp $
+    @version $Id: FGLocation.h,v 1.27 2010/11/29 12:33:58 jberndt Exp $
   */
 
 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 CLASS DECLARATION
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
-class FGLocation : virtual FGJSBBase
+class FGLocation : public FGJSBBase
 {
 public:
   /** Default constructor. */
diff --git a/src/FDM/JSBSim/models/FGAuxiliary.cpp b/src/FDM/JSBSim/models/FGAuxiliary.cpp
old mode 100755
new mode 100644
diff --git a/src/FDM/JSBSim/models/FGInput.cpp b/src/FDM/JSBSim/models/FGInput.cpp
old mode 100644
new mode 100755
index 65ab24db2..51b4a3984
--- a/src/FDM/JSBSim/models/FGInput.cpp
+++ b/src/FDM/JSBSim/models/FGInput.cpp
@@ -53,7 +53,7 @@ using namespace std;
 
 namespace JSBSim {
 
-static const char *IdSrc = "$Id: FGInput.cpp,v 1.19 2010/02/25 05:21:36 jberndt Exp $";
+static const char *IdSrc = "$Id: FGInput.cpp,v 1.20 2010/11/18 12:38:06 jberndt Exp $";
 static const char *IdHdr = ID_INPUT;
 
 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -191,7 +191,7 @@ bool FGInput::Run(void)
         ostringstream info;
         info << "JSBSim version: " << JSBSim_version << endl;
         info << "Config File version: " << needed_cfg_version << endl;
-//      info << "Aircraft simulated: " << Aircraft->GetAircraftName() << endl;
+        info << "Aircraft simulated: " << FDMExec->GetAircraft()->GetAircraftName() << endl;
         info << "Simulation time: " << setw(8) << setprecision(3) << FDMExec->GetSimTime() << endl;
         socket->Reply(info.str());
 
diff --git a/src/FDM/JSBSim/models/FGPropagate.cpp b/src/FDM/JSBSim/models/FGPropagate.cpp
index ae2174df9..6202ccc1c 100644
--- a/src/FDM/JSBSim/models/FGPropagate.cpp
+++ b/src/FDM/JSBSim/models/FGPropagate.cpp
@@ -71,7 +71,7 @@ using namespace std;
 
 namespace JSBSim {
 
-static const char *IdSrc = "$Id: FGPropagate.cpp,v 1.85 2011/04/03 19:24:58 jberndt Exp $";
+static const char *IdSrc = "$Id: FGPropagate.cpp,v 1.86 2011/04/17 11:27:14 bcoconni Exp $";
 static const char *IdHdr = ID_PROPAGATE;
 
 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -193,7 +193,6 @@ void FGPropagate::SetInitialState(const FGInitialCondition *FGIC)
   RecomputeLocalTerrainRadius();
 
   VehicleRadius = GetRadius();
-  double radInv = 1.0/VehicleRadius;
 
   // Set the angular velocities of the body frame relative to the ECEF frame,
   // expressed in the body frame.
@@ -273,9 +272,10 @@ bool FGPropagate::Run(void)
   //    orientation quaternion and vLocation vector.
   UpdateBodyMatrices();
 
-  CalculateUVW();              // Translational position derivative (velocities are integrated in the inertial frame)
+  // Translational position derivative (velocities are integrated in the inertial frame)
+  CalculateUVW();
 
-  // Set auxililary state variables
+  // Set auxilliary state variables
   RecomputeLocalTerrainRadius();
 
   VehicleRadius = GetRadius(); // Calculate current aircraft radius from center of planet
@@ -628,9 +628,9 @@ void FGPropagate::UpdateBodyMatrices(void)
 {
   Ti2b  = VState.qAttitudeECI.GetT(); // ECI to body frame transform
   Tb2i  = Ti2b.Transposed();          // body to ECI frame transform
-  Tl2b  = Ti2b*Tl2i;                  // local to body frame transform
+  Tl2b  = Ti2b * Tl2i;                // local to body frame transform
   Tb2l  = Tl2b.Transposed();          // body to local frame transform
-  Tec2b = Tl2b * Tec2l;               // ECEF to body frame transform
+  Tec2b = Ti2b * Tec2i;               // ECEF to body frame transform
   Tb2ec = Tec2b.Transposed();         // body to ECEF frame tranform
 }
 
diff --git a/src/FDM/JSBSim/models/flight_control/FGGain.cpp b/src/FDM/JSBSim/models/flight_control/FGGain.cpp
index fac82ab61..fb864e06b 100644
--- a/src/FDM/JSBSim/models/flight_control/FGGain.cpp
+++ b/src/FDM/JSBSim/models/flight_control/FGGain.cpp
@@ -47,7 +47,7 @@ using namespace std;
 
 namespace JSBSim {
 
-static const char *IdSrc = "$Id: FGGain.cpp,v 1.20 2009/10/24 22:59:30 jberndt Exp $";
+static const char *IdSrc = "$Id: FGGain.cpp,v 1.23 2011/04/18 08:51:12 andgi Exp $";
 static const char *IdHdr = ID_GAIN;
 
 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -70,7 +70,7 @@ FGGain::FGGain(FGFCS* fcs, Element* element) : FGFCSComponent(fcs, element)
 
   if (Type == "PURE_GAIN") {
     if ( !element->FindElement("gain") ) {
-      cout << highint << "      No GAIN specified (default: 1.0)" << normint << endl;
+      cerr << highint << "      No GAIN specified (default: 1.0)" << normint << endl;
     }
   }
 
diff --git a/src/FDM/JSBSim/models/propulsion/FGTurboProp.cpp b/src/FDM/JSBSim/models/propulsion/FGTurboProp.cpp
old mode 100755
new mode 100644
diff --git a/src/FDM/JSBSim/models/propulsion/FGTurboProp.h b/src/FDM/JSBSim/models/propulsion/FGTurboProp.h
old mode 100755
new mode 100644
diff --git a/src/FDM/YASim/Airplane.cpp b/src/FDM/YASim/Airplane.cpp
index 483da4269..f63eaaa5e 100644
--- a/src/FDM/YASim/Airplane.cpp
+++ b/src/FDM/YASim/Airplane.cpp
@@ -671,8 +671,8 @@ void Airplane::compile()
         t->handle = body->addMass(0, t->pos);
         totalFuel += t->cap;
     }
-    _cruiseWeight = _emptyWeight + totalFuel*0.5f;
-    _approachWeight = _emptyWeight + totalFuel*0.2f;
+    _cruiseWeight = _emptyWeight + totalFuel*_cruiseFuel;
+    _approachWeight = _emptyWeight + totalFuel*_approachFuel;
 
     body->recalc();
 
@@ -795,7 +795,7 @@ void Airplane::setupWeights(bool isApproach)
 
 void Airplane::runCruise()
 {
-    setupState(_cruiseAoA, _cruiseSpeed,_approachGlideAngle, &_cruiseState);
+    setupState(_cruiseAoA, _cruiseSpeed,_cruiseGlideAngle, &_cruiseState);
     _model.setState(&_cruiseState);
     _model.setAir(_cruiseP, _cruiseT,
                   Atmosphere::calcStdDensity(_cruiseP, _cruiseT));
diff --git a/src/GUI/MapWidget.cxx b/src/GUI/MapWidget.cxx
index b482ada90..cd648fefb 100644
--- a/src/GUI/MapWidget.cxx
+++ b/src/GUI/MapWidget.cxx
@@ -527,7 +527,6 @@ void MapWidget::draw(int dx, int dy)
 
   if (_root->getBoolValue("centre-on-aircraft")) {
     _projectionCenter = _aircraft;
-    _root->setBoolValue("centre-on-aircraft", false);
   }
 
   double julianDate = globals->get_time_params()->getJD();
diff --git a/src/Instrumentation/groundradar.cxx b/src/Instrumentation/groundradar.cxx
index ffa2e1fc9..c604cc43c 100644
--- a/src/Instrumentation/groundradar.cxx
+++ b/src/Instrumentation/groundradar.cxx
@@ -47,7 +47,7 @@
 #include "groundradar.hxx"
 
 static const char* airport_source_node_name = "airport-id-source";
-static const char* default_airport_node_name = "/sim/tower/airport-id";
+static const char* default_airport_node_name = "/sim/airport/closest-airport-id";
 static const char* texture_node_name = "texture-name";
 static const char* default_texture_name = "Aircraft/Instruments/Textures/od_groundradar.rgb";
 static const char* range_source_node_name = "range-source";
diff --git a/src/Main/fg_init.cxx b/src/Main/fg_init.cxx
index 9eb8ae7a9..50329b39f 100644
--- a/src/Main/fg_init.cxx
+++ b/src/Main/fg_init.cxx
@@ -793,14 +793,44 @@ static bool fgSetTowerPosFromAirportID( const string& id) {
 
 struct FGTowerLocationListener : SGPropertyChangeListener {
     void valueChanged(SGPropertyNode* node) {
-        const string id(node->getStringValue());
+        string id(node->getStringValue());
+        if (fgGetBool("/sim/tower/auto-position",true))
+        {
+            // enforce using closest airport when auto-positioning is enabled 
+            const char* closest_airport = fgGetString("/sim/airport/closest-airport-id", "");
+            if (closest_airport && (id != closest_airport))
+            {
+                id = closest_airport;
+                node->setStringValue(id);
+            }
+        }
         fgSetTowerPosFromAirportID(id);
     }
 };
 
+struct FGClosestTowerLocationListener : SGPropertyChangeListener
+{
+    void valueChanged(SGPropertyNode* )
+    {
+        // closest airport has changed
+        if (fgGetBool("/sim/tower/auto-position",true))
+        {
+            // update tower position
+            const char* id = fgGetString("/sim/airport/closest-airport-id", "");
+            if (id && *id!=0)
+                fgSetString("/sim/tower/airport-id", id);
+        }
+    }
+};
+
 void fgInitTowerLocationListener() {
     fgGetNode("/sim/tower/airport-id",  true)
         ->addChangeListener( new FGTowerLocationListener(), true );
+    FGClosestTowerLocationListener* ntcl = new FGClosestTowerLocationListener();
+    fgGetNode("/sim/airport/closest-airport-id", true)
+        ->addChangeListener(ntcl , true );
+    fgGetNode("/sim/tower/auto-position", true)
+           ->addChangeListener(ntcl, true );
 }
 
 static void fgApplyStartOffset(const SGGeod& aStartPos, double aHeading, double aTargetHeading = HUGE_VAL)
@@ -1163,6 +1193,7 @@ bool fgInitPosition() {
         // An airport + parking position is requested
         if ( fgSetPosFromAirportIDandParkpos( apt, parkpos ) ) {
             // set tower position
+            fgSetString("/sim/airport/closest-airport-id",  apt.c_str());
             fgSetString("/sim/tower/airport-id",  apt.c_str());
             set_pos = true;
         }
@@ -1173,7 +1204,8 @@ bool fgInitPosition() {
         if ( fgSetPosFromAirportIDandRwy( apt, rwy_no, rwy_req ) ) {
             // set tower position (a little off the heading for single
             // runway airports)
-	    fgSetString("/sim/tower/airport-id",  apt.c_str());
+            fgSetString("/sim/airport/closest-airport-id",  apt.c_str());
+            fgSetString("/sim/tower/airport-id",  apt.c_str());
             set_pos = true;
         }
     }
@@ -1183,7 +1215,8 @@ bool fgInitPosition() {
         if ( fgSetPosFromAirportIDandHdg( apt, hdg ) ) {
             // set tower position (a little off the heading for single
             // runway airports)
-	    fgSetString("/sim/tower/airport-id",  apt.c_str());
+            fgSetString("/sim/airport/closest-airport-id",  apt.c_str());
+            fgSetString("/sim/tower/airport-id",  apt.c_str());
             set_pos = true;
         }
     }
diff --git a/src/Main/options.cxx b/src/Main/options.cxx
index b4a3bc830..99ecbf43b 100644
--- a/src/Main/options.cxx
+++ b/src/Main/options.cxx
@@ -1150,12 +1150,22 @@ fgOptNAV2( const char * arg )
 }
 
 static int
-fgOptADF( const char * arg )
+fgOptADF1( const char * arg )
 {
     double rot, freq;
     if (parse_colon(arg, &rot, &freq))
-        fgSetDouble("/instrumentation/adf/rotation-deg", rot);
-    fgSetDouble("/instrumentation/adf/frequencies/selected-khz", freq);
+        fgSetDouble("/instrumentation/adf[0]/rotation-deg", rot);
+    fgSetDouble("/instrumentation/adf[0]/frequencies/selected-khz", freq);
+    return FG_OPTIONS_OK;
+}
+
+static int
+fgOptADF2( const char * arg )
+{
+    double rot, freq;
+    if (parse_colon(arg, &rot, &freq))
+        fgSetDouble("/instrumentation/adf[1]/rotation-deg", rot);
+    fgSetDouble("/instrumentation/adf[1]/frequencies/selected-khz", freq);
     return FG_OPTIONS_OK;
 }
 
@@ -1493,7 +1503,9 @@ struct OptionDesc {
     {"com2",                         true,  OPTION_DOUBLE, "/instrumentation/comm[1]/frequencies/selected-mhz", false, "", 0 },
     {"nav1",                         true,  OPTION_FUNC,   "", false, "", fgOptNAV1 },
     {"nav2",                         true,  OPTION_FUNC,   "", false, "", fgOptNAV2 },
-    {"adf",                          true,  OPTION_FUNC,   "", false, "", fgOptADF },
+    {"adf", /*legacy*/               true,  OPTION_FUNC,   "", false, "", fgOptADF1 },
+    {"adf1",                         true,  OPTION_FUNC,   "", false, "", fgOptADF1 },
+    {"adf2",                         true,  OPTION_FUNC,   "", false, "", fgOptADF2 },
     {"dme",                          true,  OPTION_FUNC,   "", false, "", fgOptDME },
     {"min-status",                   true,  OPTION_STRING,  "/sim/aircraft-min-status", false, "all", 0 },
     {"livery",                       true,  OPTION_FUNC,   "", false, "", fgOptLivery },
diff --git a/src/Main/renderer.cxx b/src/Main/renderer.cxx
index d1fa367cf..c88003f1e 100644
--- a/src/Main/renderer.cxx
+++ b/src/Main/renderer.cxx
@@ -613,11 +613,11 @@ FGRenderer::update( bool refresh_camera_settings ) {
 	
         if ( fgGetBool("/sim/rendering/textures") ) {
             SGVec4f clearColor(l->adj_fog_color());
-            camera->setClearColor(toOsg(clearColor));
+            camera->setClearColor(osg::Vec4(0.0, 0.0, 0.0, 1.0));
         }
     } else {
         SGVec4f clearColor(l->sky_color());
-        camera->setClearColor(toOsg(clearColor));
+        camera->setClearColor(osg::Vec4(0.0, 0.0, 0.0, 1.0));
     }
 
     // update fog params if visibility has changed
diff --git a/src/Scenery/tilemgr.cxx b/src/Scenery/tilemgr.cxx
index 6c19ec5c0..7b59d60b0 100644
--- a/src/Scenery/tilemgr.cxx
+++ b/src/Scenery/tilemgr.cxx
@@ -88,6 +88,8 @@ FGTileMgr::~FGTileMgr() {
     group->removeChildren(0, group->getNumChildren());
     delete _propListener;
     _propListener = NULL;
+    // clear OSG cache
+    osgDB::Registry::instance()->clearObjectCache();
 }
 
 
@@ -122,6 +124,12 @@ void FGTileMgr::reinit()
     group->removeChildren(0, group->getNumChildren());
     tile_cache.init();
     
+    // clear OSG cache, except on initial start-up
+    if (state != Start)
+    {
+        osgDB::Registry::instance()->clearObjectCache();
+    }
+    
     state = Inited;
     
     previous_bucket.make_bad();