diff --git a/Modules/IGT/IO/mitkNavigationDataSetWriterCSV.cpp b/Modules/IGT/IO/mitkNavigationDataSetWriterCSV.cpp
index 80398fa31d..6b3fe24c1f 100644
--- a/Modules/IGT/IO/mitkNavigationDataSetWriterCSV.cpp
+++ b/Modules/IGT/IO/mitkNavigationDataSetWriterCSV.cpp
@@ -1,29 +1,74 @@
 /*===================================================================
 
 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.
 
 ===================================================================*/
 
 #include "mitkNavigationDataSetWriterCSV.h"
 
 
 void mitk::NavigationDataSetWriterCSV::Write (std::string path, mitk::NavigationDataSet::Pointer data)
 {
-  MITK_WARN << "NavigationDataSetWriterCSV class not implemented yet: cannot write!";
+  MITK_INFO << "Writing navigation data set to file: " << path;
+  std::ofstream stream;
+  stream.open (path.c_str(), std::ios_base::trunc);
+
+  // Pass to Stream Handler
+  Write(&stream, data);
+  stream.close();
+}
+
+void mitk::NavigationDataSetWriterCSV::Write (std::ostream* stream, mitk::NavigationDataSet::Pointer data)
+{
+  //write header
+  int numberOfTools = data->GetNumberOfTools();
+  for (unsigned int index = 0; index < numberOfTools; index++){ *stream << "TimeStamp_Tool" << index <<
+                                                                           ";Valid_Tool" << index <<
+                                                                           ";X_Tool" << index <<
+                                                                           ";Y_Tool" << index <<
+                                                                           ";Z_Tool" << index <<
+                                                                           ";QX_Tool" << index <<
+                                                                           ";QY_Tool" << index <<
+                                                                           ";QZ_Tool" << index <<
+                                                                           ";QR_Tool" << index << ";";}
+  *stream << "\n";
+
+  stream->precision(15); // rounding precision because we don't want to loose data.
+
+  //write data
+  MITK_INFO << "Number of timesteps: " << data->Size();
+  for (int i=0; i<data->Size(); i++)
+  {
+    std::vector< mitk::NavigationData::Pointer > NavigationDatasOfCurrentStep = data->GetTimeStep(i);
+    for (int toolIndex = 0; toolIndex < numberOfTools; toolIndex++)
+    {
+      mitk::NavigationData::Pointer nd = NavigationDatasOfCurrentStep.at(toolIndex);
+      *stream          << nd->GetTimeStamp() << ";"
+                       << nd->IsDataValid() << ";"
+                       << nd->GetPosition()[0] << ";"
+                       << nd->GetPosition()[1] << ";"
+                       << nd->GetPosition()[2] << ";"
+                       << nd->GetOrientation()[0] << ";"
+                       << nd->GetOrientation()[1] << ";"
+                       << nd->GetOrientation()[2] << ";"
+                       << nd->GetOrientation()[3] << ";";
+    }
+    *stream << "\n";
+  }
 }
 
 mitk::NavigationDataSetWriterCSV::NavigationDataSetWriterCSV()
 {}
 
 mitk::NavigationDataSetWriterCSV::~NavigationDataSetWriterCSV()
 {}
diff --git a/Modules/IGT/IO/mitkNavigationDataSetWriterCSV.h b/Modules/IGT/IO/mitkNavigationDataSetWriterCSV.h
index 00253f6df7..6e295017fc 100644
--- a/Modules/IGT/IO/mitkNavigationDataSetWriterCSV.h
+++ b/Modules/IGT/IO/mitkNavigationDataSetWriterCSV.h
@@ -1,34 +1,35 @@
 /*===================================================================
 
 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.
 
 ===================================================================*/
 
 
 #ifndef MITKNavigationDataSetWriterCSV_H_HEADER_INCLUDED_
 #define MITKNavigationDataSetWriterCSV_H_HEADER_INCLUDED_
 
 #include <mitkNavigationDataSet.h>
 
 namespace mitk {
   class MitkIGT_EXPORT NavigationDataSetWriterCSV
   {
   public:
      NavigationDataSetWriterCSV();
     ~NavigationDataSetWriterCSV();
 
     virtual void Write (std::string path, mitk::NavigationDataSet::Pointer );
+    virtual void Write (std::ostream* stream, mitk::NavigationDataSet::Pointer);
   };
 }
 
 #endif // MITKNavigationDataSetWriterCSV_H_HEADER_INCLUDED_