diff --git a/src/AIModel/AIFlightPlanCreateCruise.cxx b/src/AIModel/AIFlightPlanCreateCruise.cxx
index d7761b5d2..4f44ab1e2 100755
--- a/src/AIModel/AIFlightPlanCreateCruise.cxx
+++ b/src/AIModel/AIFlightPlanCreateCruise.cxx
@@ -65,7 +65,7 @@ void FGAIFlightPlan::evaluateRoutePart(double deplat,
       sgdVec3 newPos;
       sgdMat4 matrix;
       //cerr << "Angle = " << ang << endl;
-      sgdMakeRotMat4(matrix, ang, _cross.sg());
+      sgdMakeRotMat4(matrix, ang, _cross.data());
       for(int j = 0; j < 3; j++)
       {
         newPos[j] =0.0;
diff --git a/src/Instrumentation/navradio.cxx b/src/Instrumentation/navradio.cxx
index 916155efb..831f1b8f6 100644
--- a/src/Instrumentation/navradio.cxx
+++ b/src/Instrumentation/navradio.cxx
@@ -367,8 +367,8 @@ bool FGNavRadio::updateWithPower(double dt)
     
   if (_gs) {
     // find closest distance to the gs base line
-    double dist = sgdClosestPointToLineDistSquared(aircraft.sg(), _gs->cart().sg(),
-                                                   gs_base_vec.sg());
+    double dist = sgdClosestPointToLineDistSquared(aircraft.data(), _gs->cart().data(),
+                                                   gs_base_vec.data());
     gs_dist_node->setDoubleValue( sqrt( dist ) );
     // cout << "gs_dist = " << gs_dist_node->getDoubleValue()
     //      << endl;
diff --git a/src/Main/main.cxx b/src/Main/main.cxx
index 8c64afae1..89756f393 100644
--- a/src/Main/main.cxx
+++ b/src/Main/main.cxx
@@ -544,8 +544,8 @@ static void fgMainLoop( void ) {
     // proper coordinate system, but also with the proper time
     // invariant magnitude.
     sgdSubVec3( sgdv3_help,
-                last_model_pos, model_pos.sg());
-    sgdAddVec3( last_model_pos, sgdv3_null, model_pos.sg());
+                last_model_pos, model_pos.data());
+    sgdAddVec3( last_model_pos, sgdv3_null, model_pos.data());
     SGV3d_help = model_or.rotateBack(
         surf_or.rotateBack(SGVec3d(sgdv3_help[0],
         sgdv3_help[1], sgdv3_help[2])));
@@ -560,9 +560,9 @@ static void fgMainLoop( void ) {
 
     // check for moving or stationary listener (view position)
     sgdSubVec3( sgdv3_help,
-                last_listener_pos, current_view->get_view_pos().sg());
+                last_listener_pos, current_view->get_view_pos().data());
     sgdAddVec3( last_listener_pos,
-		sgdv3_null, current_view->get_view_pos().sg());
+		sgdv3_null, current_view->get_view_pos().data());
 
     if ( sgdLengthVec3(sgdv3_help) > 0.2 ) {
 	sgCopyVec3( listener_vel, model_vel );
@@ -575,8 +575,8 @@ static void fgMainLoop( void ) {
     // set positional offset for sources
     sgdVec3 dsource_pos_offset;
     sgdSubVec3( dsource_pos_offset,
-                current_view->get_view_pos().sg(),
-                model_pos.sg() );
+                current_view->get_view_pos().data(),
+                model_pos.data() );
     SGVec3d sgv_dsource_pos_offset = model_or.rotateBack(
         surf_or.rotateBack(SGVec3d(dsource_pos_offset[0],
         dsource_pos_offset[1], dsource_pos_offset[2])));
diff --git a/src/Sound/fg_fx.cxx b/src/Sound/fg_fx.cxx
index 1774b3a63..cb78616e8 100644
--- a/src/Sound/fg_fx.cxx
+++ b/src/Sound/fg_fx.cxx
@@ -270,8 +270,8 @@ FGFX::update_pos_and_orientation(SGSoundMgr *smgr, double dt)
                     ));
     sgSetVec3(listener_vel, SGV3d_help[0], SGV3d_help[1], SGV3d_help[2]);
 
-    sgdSubVec3(sgdv3_help, last_model_pos, absolute_view_pos.sg());
-    sgdAddVec3(last_model_pos, sgdv3_null, absolute_view_pos.sg());
+    sgdSubVec3(sgdv3_help, last_model_pos, absolute_view_pos.data());
+    sgdAddVec3(last_model_pos, sgdv3_null, absolute_view_pos.data());
 
     SGV3d_help = model_or.rotateBack(
                     surf_or.rotateBack(
@@ -303,7 +303,7 @@ FGFX::update_pos_and_orientation(SGSoundMgr *smgr, double dt)
     sgdVec3 dsource_pos_offset;
     sgdSubVec3( dsource_pos_offset,
                 (double*) &observer->get_view_pos(),
-                absolute_view_pos.sg() );
+                absolute_view_pos.data() );
     SGVec3d sgv_dsource_pos_offset;
     sgv_dsource_pos_offset = model_or.rotateBack(
                                 surf_or.rotateBack(
diff --git a/src/Traffic/Schedule.cxx b/src/Traffic/Schedule.cxx
index fda2c8244..b5297301a 100644
--- a/src/Traffic/Schedule.cxx
+++ b/src/Traffic/Schedule.cxx
@@ -339,7 +339,7 @@ bool FGAISchedule::update(time_t now)
 	  //cout << "a = " << a[0] << " " << a[1] << " " << a[2] 
 	  //     << "b = " << b[0] << " " << b[1] << " " << b[2] << endl;  
           sgdMat4 matrix;
-	  sgdMakeRotMat4(matrix, angle, _cross.sg()); 
+	  sgdMakeRotMat4(matrix, angle, _cross.data()); 
           SGVec3d newPos(0, 0, 0);
 	  for(int j = 0; j < 3; j++)
 	    {