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+// magvarmanager.cxx -- Wraps the SimGear SGMagVar in a subsystem
+//
+// Copyright (C) 2012  James Turner - zakalawe@mac.com
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "magvarmanager.hxx"
+
+#include <simgear/sg_inlines.h>
+#include <simgear/magvar/magvar.hxx>
+#include <simgear/timing/sg_time.hxx>
+#include <simgear/math/SGMath.hxx>
+
+#include <Main/globals.hxx>
+#include <Main/fg_props.hxx>
+
+FGMagVarManager::FGMagVarManager() :
+    _magVar(new SGMagVar)
+{
+}
+
+FGMagVarManager::~FGMagVarManager()
+{
+}
+
+void FGMagVarManager::init()
+{
+    update(0.0); // force an immediate update
+}
+
+void FGMagVarManager::bind()
+{
+  _magVarNode = fgGetNode("/environment/magnetic-variation-deg", true);
+  _magDipNode = fgGetNode("/environment/magnetic-dip-deg", true);
+}
+
+void FGMagVarManager::unbind()
+{
+  _magVarNode = SGPropertyNode_ptr();
+  _magDipNode = SGPropertyNode_ptr();
+}
+
+void FGMagVarManager::update(double dt)
+{
+  SG_UNUSED(dt);
+    
+  // update magvar model
+  _magVar->update( globals->get_aircraft_position(),
+                     globals->get_time_params()->getJD() );
+  
+  _magVarNode->setDoubleValue(_magVar->get_magvar() * SG_RADIANS_TO_DEGREES);
+  _magDipNode->setDoubleValue(_magVar->get_magdip() * SG_RADIANS_TO_DEGREES);
+    
+}
+
+
+// Register the subsystem.
+SGSubsystemMgr::Registrant<FGMagVarManager> registrantFGMagVarManager;