diff --git a/Modules/IGT/IO/mitkNavigationDataSetWriterXML.cpp b/Modules/IGT/IO/mitkNavigationDataSetWriterXML.cpp
index dd8baad821..9ce7eee434 100644
--- a/Modules/IGT/IO/mitkNavigationDataSetWriterXML.cpp
+++ b/Modules/IGT/IO/mitkNavigationDataSetWriterXML.cpp
@@ -1,130 +1,130 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 // MITK
 #include "mitkNavigationDataSetWriterXML.h"
 
 // Third Party
 #include <tinyxml.h>
 #include <itksys/SystemTools.hxx>
 #include <fstream>
 #include <iostream>
 
 mitk::NavigationDataSetWriterXML::NavigationDataSetWriterXML()
 {
 }
 
 mitk::NavigationDataSetWriterXML::~NavigationDataSetWriterXML()
 {
 }
 
 void mitk::NavigationDataSetWriterXML::Write (std::string path, mitk::NavigationDataSet::Pointer data)
 {
   std::ofstream stream;
-  stream.open (path);
+  stream.open (path.c_str(), std::ios_base::trunc);
 
   // Pass to Stream Handler
   Write(&stream, data);
   stream.close();
 }
 
 void mitk::NavigationDataSetWriterXML::Write (std::ostream* stream, mitk::NavigationDataSet::Pointer data)
 {
   StreamHeader(stream, data);
   StreamData(stream, data);
   StreamFooter(stream);
 
   // Cleanup
 
   stream->flush();
 }
 
 void mitk::NavigationDataSetWriterXML::StreamHeader (std::ostream* stream, mitk::NavigationDataSet::Pointer data)
 {
   stream->precision(10);
 
   //TODO store date and GMT time
   //checking if the stream is good
   if (stream->good())
   {
     *stream << "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>" << std::endl;
     /**m_Stream << "<Version Ver=\"1\" />" << std::endl;*/
     // should be a generic version, meaning a member variable, which has the actual version
     *stream << "    " << "<Data ToolCount=\"" << data->GetNumberOfTools() << "\" version=\"1.0\">" << std::endl;
   }
 }
 
 void mitk::NavigationDataSetWriterXML::StreamData (std::ostream* stream, mitk::NavigationDataSet::Pointer data)
 {
   // For each time step in the Dataset
   for (mitk::NavigationDataSet::NavigationDataSetIterator it = data->Begin(); it != data->End(); it++)
   {
     for (int toolIndex = 0; toolIndex < it->size(); toolIndex++)
     {
       mitk::NavigationData::Pointer nd = it->at(toolIndex);
       TiXmlElement* elem = new TiXmlElement("ND");
 
       elem->SetDoubleAttribute("Time", nd->GetIGTTimeStamp());
       // elem->SetAttribute("SystemTime", sysTimeStr); // tag for system time
       elem->SetDoubleAttribute("Tool", toolIndex);
       elem->SetDoubleAttribute("X", nd->GetPosition()[0]);
       elem->SetDoubleAttribute("Y", nd->GetPosition()[1]);
       elem->SetDoubleAttribute("Z", nd->GetPosition()[2]);
 
       elem->SetDoubleAttribute("QX", nd->GetOrientation()[0]);
       elem->SetDoubleAttribute("QY", nd->GetOrientation()[1]);
       elem->SetDoubleAttribute("QZ", nd->GetOrientation()[2]);
       elem->SetDoubleAttribute("QR", nd->GetOrientation()[3]);
 
       elem->SetDoubleAttribute("C00", nd->GetCovErrorMatrix()[0][0]);
       elem->SetDoubleAttribute("C01", nd->GetCovErrorMatrix()[0][1]);
       elem->SetDoubleAttribute("C02", nd->GetCovErrorMatrix()[0][2]);
       elem->SetDoubleAttribute("C03", nd->GetCovErrorMatrix()[0][3]);
       elem->SetDoubleAttribute("C04", nd->GetCovErrorMatrix()[0][4]);
       elem->SetDoubleAttribute("C05", nd->GetCovErrorMatrix()[0][5]);
       elem->SetDoubleAttribute("C10", nd->GetCovErrorMatrix()[1][0]);
       elem->SetDoubleAttribute("C11", nd->GetCovErrorMatrix()[1][1]);
       elem->SetDoubleAttribute("C12", nd->GetCovErrorMatrix()[1][2]);
       elem->SetDoubleAttribute("C13", nd->GetCovErrorMatrix()[1][3]);
       elem->SetDoubleAttribute("C14", nd->GetCovErrorMatrix()[1][4]);
       elem->SetDoubleAttribute("C15", nd->GetCovErrorMatrix()[1][5]);
 
       if (nd->IsDataValid())
         elem->SetAttribute("Valid",1);
       else
         elem->SetAttribute("Valid",0);
 
       if (nd->GetHasOrientation())
         elem->SetAttribute("hO",1);
       else
         elem->SetAttribute("hO",0);
 
       if (nd->GetHasPosition())
         elem->SetAttribute("hP",1);
       else
         elem->SetAttribute("hP",0);
 
       *stream << "        " << *elem << std::endl;
 
       delete elem;
     }
   }
 }
 
 void mitk::NavigationDataSetWriterXML::StreamFooter (std::ostream* stream)
 {
   *stream << "</Data>" << std::endl;
 }