diff --git a/src/Autopilot/autopilotgroup.cxx b/src/Autopilot/autopilotgroup.cxx
index c9df860d2..c60ea3010 100644
--- a/src/Autopilot/autopilotgroup.cxx
+++ b/src/Autopilot/autopilotgroup.cxx
@@ -49,6 +49,7 @@ public:
     virtual void addAutopilot( const std::string & name, SGPropertyNode_ptr apNode, SGPropertyNode_ptr config );
     virtual void removeAutopilot( const std::string & name );
     void init();
+    InitStatus incrementalInit();
     void reinit();
     void update( double dt );
 private:
@@ -101,6 +102,12 @@ void FGXMLAutopilotGroupImplementation::reinit()
     init();
 }
 
+SGSubsystem::InitStatus FGXMLAutopilotGroupImplementation::incrementalInit()
+{
+  init();
+  return INIT_DONE;
+}
+
 void FGXMLAutopilotGroupImplementation::init()
 {
     initFrom( fgGetNode( "/sim/systems" ), _nodeName.c_str() );
diff --git a/src/Environment/environment_mgr.cxx b/src/Environment/environment_mgr.cxx
index a1e22555d..e7688d793 100644
--- a/src/Environment/environment_mgr.cxx
+++ b/src/Environment/environment_mgr.cxx
@@ -132,23 +132,26 @@ FGEnvironmentMgr::~FGEnvironmentMgr ()
   delete _3dCloudsEnableListener;
 }
 
-void
-FGEnvironmentMgr::init ()
+SGSubsystem::InitStatus FGEnvironmentMgr::incrementalInit()
 {
-  SG_LOG( SG_ENVIRONMENT, SG_INFO, "Initializing environment subsystem");
-  SGSubsystemGroup::init();
-  fgClouds->Init();
-
-  // FIXME: is this really part of the environment_mgr?
-  // Initialize the longitude, latitude and altitude to the initial position
-  // of the aircraft so that the atmospheric properties (pressure, temperature
-  // and density) can be initialized accordingly.
-  _altitude_n->setDoubleValue(fgGetDouble("/sim/presets/altitude-ft"));
-  _longitude_n->setDoubleValue(fgGetDouble("/sim/presets/longitude-deg"));
-  _latitude_n->setDoubleValue(fgGetDouble("/sim/presets/latitude-deg"));
   
-  globals->get_event_mgr()->addTask("updateClosestAirport", this,
-                                    &FGEnvironmentMgr::updateClosestAirport, 30 );
+  InitStatus r = SGSubsystemGroup::incrementalInit();
+  if (r == INIT_DONE) {
+    fgClouds->Init();
+    
+    // FIXME: is this really part of the environment_mgr?
+    // Initialize the longitude, latitude and altitude to the initial position
+    // of the aircraft so that the atmospheric properties (pressure, temperature
+    // and density) can be initialized accordingly.
+    _altitude_n->setDoubleValue(fgGetDouble("/sim/presets/altitude-ft"));
+    _longitude_n->setDoubleValue(fgGetDouble("/sim/presets/longitude-deg"));
+    _latitude_n->setDoubleValue(fgGetDouble("/sim/presets/latitude-deg"));
+    
+    globals->get_event_mgr()->addTask("updateClosestAirport", this,
+                                      &FGEnvironmentMgr::updateClosestAirport, 30 );
+  }
+  
+  return r;
 }
 
 void
diff --git a/src/Environment/environment_mgr.hxx b/src/Environment/environment_mgr.hxx
index 64e4d9f8f..93213ecb5 100644
--- a/src/Environment/environment_mgr.hxx
+++ b/src/Environment/environment_mgr.hxx
@@ -54,7 +54,7 @@ public:
   FGEnvironmentMgr ();
   virtual ~FGEnvironmentMgr ();
 
-  virtual void init ();
+  virtual InitStatus incrementalInit ();
   virtual void reinit ();
   virtual void shutdown ();
   virtual void bind ();
@@ -103,7 +103,6 @@ private:
   simgear::TiedPropertyList _tiedProperties;
   SGPropertyChangeListener * _3dCloudsEnableListener;
   SGSky* _sky;
-    
 };
 
 #endif // _ENVIRONMENT_MGR_HXX
diff --git a/src/Environment/terrainsampler.cxx b/src/Environment/terrainsampler.cxx
index b4a7beabf..744b3ef97 100644
--- a/src/Environment/terrainsampler.cxx
+++ b/src/Environment/terrainsampler.cxx
@@ -321,6 +321,7 @@ public:
     virtual ~TerrainSamplerImplementation ();
     
     virtual void init ();
+    virtual InitStatus incrementalInit ();
     virtual void postinit();
     virtual void reinit ();
     virtual void bind();
@@ -347,6 +348,12 @@ TerrainSamplerImplementation::TerrainSamplerImplementation( SGPropertyNode_ptr r
 TerrainSamplerImplementation::~TerrainSamplerImplementation()
 {
 }
+  
+SGSubsystem::InitStatus TerrainSamplerImplementation::incrementalInit()
+{
+  init();
+  return INIT_DONE;
+}
 
 void TerrainSamplerImplementation::init()
 {
diff --git a/src/Instrumentation/instrument_mgr.cxx b/src/Instrumentation/instrument_mgr.cxx
index 121df9bd8..d47917468 100644
--- a/src/Instrumentation/instrument_mgr.cxx
+++ b/src/Instrumentation/instrument_mgr.cxx
@@ -63,6 +63,12 @@ FGInstrumentMgr::~FGInstrumentMgr ()
 {
 }
 
+SGSubsystem::InitStatus FGInstrumentMgr::incrementalInit()
+{
+  init();
+  return INIT_DONE;
+}
+
 void FGInstrumentMgr::init()
 {
   SGPropertyNode_ptr config_props = new SGPropertyNode;
diff --git a/src/Instrumentation/instrument_mgr.hxx b/src/Instrumentation/instrument_mgr.hxx
index d7c9b2a07..cda6550e5 100644
--- a/src/Instrumentation/instrument_mgr.hxx
+++ b/src/Instrumentation/instrument_mgr.hxx
@@ -33,6 +33,7 @@ public:
     virtual ~FGInstrumentMgr ();
     
     virtual void init();
+    virtual InitStatus incrementalInit();
     virtual void reinit();
 private:
     bool build (SGPropertyNode* config_props);