diff --git a/corelib/src/Graph.cpp b/corelib/src/Graph.cpp
index d852dc4ba8..8b5ba1ae35 100644
--- a/corelib/src/Graph.cpp
+++ b/corelib/src/Graph.cpp
@@ -524,9 +524,9 @@ bool exportGPS(
 			for(std::map<int, GPS>::const_iterator iter=gpsValues.begin(); iter!=gpsValues.end(); ++iter)
 			{
 				values += uFormat("%s,%s,%s ",
-                                  uReplaceChar(uNumber2Str(iter->second.longitude(), 8), ',', '.').c_str(),
-                                  uReplaceChar(uNumber2Str(iter->second.latitude(), 8), ',', '.').c_str(),
-                                  uReplaceChar(uNumber2Str(iter->second.altitude(), 8), ',', '.').c_str());
+                                  uReplaceChar(uNumber2Str(iter->second.longitude(), 8, true), ',', '.').c_str(),
+                                  uReplaceChar(uNumber2Str(iter->second.latitude(), 8, true), ',', '.').c_str(),
+                                  uReplaceChar(uNumber2Str(iter->second.altitude(), 8, true), ',', '.').c_str());
 			}
 
 			// switch argb (Qt format) -> abgr
diff --git a/utilite/include/rtabmap/utilite/UConversion.h b/utilite/include/rtabmap/utilite/UConversion.h
index 0b9fd9d356..024d09b0c7 100644
--- a/utilite/include/rtabmap/utilite/UConversion.h
+++ b/utilite/include/rtabmap/utilite/UConversion.h
@@ -109,13 +109,13 @@ std::string UTILITE_EXP uNumber2Str(int number);
  * @param number the number to convert in a string
  * @return the string
  */
-std::string UTILITE_EXP uNumber2Str(float number, int precision=6);
+std::string UTILITE_EXP uNumber2Str(float number, int precision=6, bool fixed = false);
 /**
  * Convert a number (double) to a string.
  * @param number the number to convert in a string
  * @return the string
  */
-std::string UTILITE_EXP uNumber2Str(double number, int precision=6);
+std::string UTILITE_EXP uNumber2Str(double number, int precision=6, bool fixed = false);
 
 /**
  * Convert a string to an integer.
diff --git a/utilite/src/UConversion.cpp b/utilite/src/UConversion.cpp
index b310fec34b..200024c0a4 100644
--- a/utilite/src/UConversion.cpp
+++ b/utilite/src/UConversion.cpp
@@ -102,17 +102,23 @@ std::string uNumber2Str(int number)
 	return s.str();
 }
 
-std::string uNumber2Str(float number, int precision)
+std::string uNumber2Str(float number, int precision, bool fixed)
 {
 	std::stringstream s;
-	s << std::setprecision(precision) << std::fixed << number;
+	s << std::setprecision(precision);
+	if(fixed)
+		s << std::fixed;
+	s << number;
 	return s.str();
 }
 
-std::string uNumber2Str(double number, int precision)
+std::string uNumber2Str(double number, int precision, bool fixed)
 {
 	std::stringstream s;
-	s << std::setprecision(precision) << std::fixed << number;
+	s << std::setprecision(precision);
+	if(fixed)
+		s << std::fixed;
+	s << number;
 	return s.str();
 }