diff --git a/src/Cockpit/Makefile.am b/src/Cockpit/Makefile.am
index 46b231a30..bc94710e3 100644
--- a/src/Cockpit/Makefile.am
+++ b/src/Cockpit/Makefile.am
@@ -2,7 +2,7 @@ noinst_LIBRARIES = libCockpit.a
 
 libCockpit_a_SOURCES = \
 	cockpit.cxx cockpit.hxx \
-	hud.cxx hud.hxx hud_opts.hxx \
+	hud.cxx hud.hxx \
 	hud_card.cxx hud_dnst.cxx hud_gaug.cxx hud_inst.cxx \
 	hud_labl.cxx hud_ladr.cxx \
 	hud_lat.cxx hud_lon.cxx \
diff --git a/src/Cockpit/hud.hxx b/src/Cockpit/hud.hxx
index 73582fe26..da3bf862f 100644
--- a/src/Cockpit/hud.hxx
+++ b/src/Cockpit/hud.hxx
@@ -21,8 +21,8 @@
 // $Id$
 
 
-#ifndef _HUD_HXX
-#define _HUD_HXX
+#ifndef _OLDHUD_HXX
+#define _OLDHUD_HXX
 
 #ifndef __cplusplus
 # error This library requires C++
@@ -50,8 +50,9 @@
 #include <deque>        // STL double ended queue
 #include STL_FSTREAM
 
+#include <simgear/math/fastmath.hxx>    // float_to_int()
 #include <simgear/constants.h>
-//#include <simgear/props/props.hxx>
+#include <simgear/props/props.hxx>
 
 #include <Include/fg_typedefs.h>
 #include <Aircraft/aircraft.hxx>
@@ -62,7 +63,6 @@
 #include <Main/viewmgr.hxx>
 #include <Airports/runways.hxx>
 
-#include "hud_opts.hxx"
 #include <plib/sg.h>
 
 SG_USING_STD(deque);
@@ -287,7 +287,7 @@ public:
         if ( HUDtext && str ) {
             float r, l ;
             HUD_Font->getBBox ( str, HUD_TextSize, 0, &l, &r, NULL, NULL ) ;
-            return FloatToInt( r - l );
+            return float_to_int( r - l );
         }
         return 0 ;
     }
@@ -297,7 +297,7 @@ public:
         if ( HUDtext && strlen( msg )) {
             float r, l ;
             HUD_Font->getBBox ( msg, HUD_TextSize, 0, &l, &r, NULL, NULL ) ;
-            return FloatToInt( r - l );
+            return float_to_int( r - l );
         }
         return 0 ;
     }
@@ -354,7 +354,7 @@ public:
 
     void Draw()
     {
-        guiFnt.drawString( msg, FloatToInt(x), FloatToInt(y) );
+        guiFnt.drawString( msg, float_to_int(x), float_to_int(y) );
     }
 };
 
@@ -490,7 +490,7 @@ public:
         if ( HUDtext && str ) {
             float r, l ;
             HUD_Font->getBBox ( str, HUD_TextSize, 0, &l, &r, NULL, NULL ) ;
-            return FloatToInt( r - l );
+            return float_to_int( r - l );
         }
         return 0 ;
     }
@@ -898,4 +898,4 @@ private:
     float _r, _g, _b, _a, _cl;
 };
 
-#endif // _HUD_H
+#endif // _OLDHUD_H
diff --git a/src/Cockpit/hud_card.cxx b/src/Cockpit/hud_card.cxx
index c60efd0d0..921c5990d 100644
--- a/src/Cockpit/hud_card.cxx
+++ b/src/Cockpit/hud_card.cxx
@@ -339,8 +339,8 @@ void hud_card::draw(void) //  (HUD_scale * pscale)
 
             // draw scale or tape
 
-//            last = FloatToInt(vmax)+1;
-//            i = FloatToInt(vmin);
+//            last = float_to_int(vmax)+1;
+//            i = float_to_int(vmin);
             last = (int)vmax + 1; // N
             i = (int)vmin; // N
 
@@ -464,7 +464,7 @@ void hud_card::draw(void) //  (HUD_scale * pscale)
                                 }
 
                                 lenstr = sprintf(TextScale, "%d",
-                                        FloatToInt(disp_val * data_scaling()/*+.5*/));
+                                        float_to_int(disp_val * data_scaling()/*+.5*/));
                                 // (int)(disp_val  * data_scaling() +.5));
                                 /* if (((marker_ys - 8) > scrn_rect.top) &&
                                    ((marker_ys + 8) < (height))){ */
@@ -642,8 +642,8 @@ void hud_card::draw(void) //  (HUD_scale * pscale)
 
             // printf("vmin = %d  vmax = %d\n", (int)vmin, (int)vmax);
 
-            //  last = FloatToInt(vmax)+1;
-            //  i    = FloatToInt(vmin);
+            //  last = float_to_int(vmax)+1;
+            //  i    = float_to_int(vmin);
 
             if (zoom == 1) {
                 zoomed_scale((int)vmin,(int)vmax);
@@ -733,7 +733,7 @@ void hud_card::draw(void) //  (HUD_scale * pscale)
                                 // printf("%d\n", (int)(disp_val  * (double)data_scaling() + 0.5));
                                 lenstr = sprintf(TextScale, "%d",
                                         // (int)(disp_val  * data_scaling() +.5));
-                                        FloatToInt(disp_val * data_scaling()/*+.5*/));
+                                        float_to_int(disp_val * data_scaling()/*+.5*/));
 
                                 // Draw major ticks and text only if far enough from the edge.
                                 if (((marker_xs - 10)> scrn_rect.left)
diff --git a/src/Cockpit/hud_gaug.cxx b/src/Cockpit/hud_gaug.cxx
index 30b91bd4c..04c2018ed 100644
--- a/src/Cockpit/hud_gaug.cxx
+++ b/src/Cockpit/hud_gaug.cxx
@@ -95,8 +95,8 @@ void gauge_instr::draw(void)
 
         if (!huds_noticks(options)) {    // If not no ticks...:)
             // Calculate x marker offsets
-            int last = (int)vmax + 1;    // FloatToInt(vmax)+1;
-            i = (int)vmin; //FloatToInt(vmin);
+            int last = (int)vmax + 1;    // float_to_int(vmax)+1;
+            i = (int)vmin; //float_to_int(vmin);
 
             for (; i < last; i++) {
                 // Calculate the location of this tick
@@ -135,7 +135,7 @@ void gauge_instr::draw(void)
                         if (!huds_notext(options)) {
                             disp_val = i;
                             sprintf(TextScale, "%d",
-                                    FloatToInt(disp_val * data_scaling()/*+.5*/));
+                                    float_to_int(disp_val * data_scaling()/*+.5*/));
 
                             lenstr = getStringWidth(TextScale);
 
@@ -143,12 +143,12 @@ void gauge_instr::draw(void)
                                 text_x = mid_scr.x -  lenstr/2 ;
 
                             } else if (huds_left(options)) {
-                                text_x = FloatToInt(marker_xs - lenstr);
+                                text_x = float_to_int(marker_xs - lenstr);
                             } else {
-                                text_x = FloatToInt(marker_xe - lenstr);
+                                text_x = float_to_int(marker_xe - lenstr);
                             }
                             // Now we know where to put the text.
-                            text_y = FloatToInt(marker_ys);
+                            text_y = float_to_int(marker_ys);
                             textString(text_x, text_y, TextScale, 0);
                         }
                     }
@@ -160,20 +160,20 @@ void gauge_instr::draw(void)
         // have been drawn, text_x and text_y may be recycled. This is used
         // with the marker start stops to produce a pointer for each side reading
 
-        text_y = scrn_rect.top + FloatToInt((cur_value - vmin) * factor() /*+.5f*/);
+        text_y = scrn_rect.top + float_to_int((cur_value - vmin) * factor() /*+.5f*/);
         //    text_x = marker_xs - scrn_rect.left;
 
         if (huds_right(options)) {
             glBegin(GL_LINE_STRIP);
             glVertex2f(scrn_rect.left, text_y + 5);
-            glVertex2f(FloatToInt(marker_xe), text_y);
+            glVertex2f(float_to_int(marker_xe), text_y);
             glVertex2f(scrn_rect.left, text_y - 5);
             glEnd();
         }
         if (huds_left(options)) {
             glBegin(GL_LINE_STRIP);
             glVertex2f(width, text_y + 5);
-            glVertex2f(FloatToInt(marker_xs), text_y);
+            glVertex2f(float_to_int(marker_xs), text_y);
             glVertex2f(width, text_y - 5);
             glEnd();
         }
@@ -218,8 +218,8 @@ void gauge_instr::draw(void)
         }
 
 
-        int last = (int)vmax + 1; //FloatToInt(vmax)+1;
-        i = (int)vmin; //FloatToInt(vmin);
+        int last = (int)vmax + 1; //float_to_int(vmax)+1;
+        i = (int)vmin; //float_to_int(vmin);
         for (; i <last ; i++) {
             condition = true;
             if (!modulo() && i < min_val())
@@ -259,7 +259,7 @@ void gauge_instr::draw(void)
                             disp_val = i;
                         }
                         sprintf(TextScale, "%d",
-                                FloatToInt(disp_val * data_scaling()/* +.5*/));
+                                float_to_int(disp_val * data_scaling()/* +.5*/));
                         lenstr = getStringWidth(TextScale);
 
                         // Draw major ticks and text only if far enough from the edge.
diff --git a/src/Cockpit/hud_ladr.cxx b/src/Cockpit/hud_ladr.cxx
index a724b5404..e76732015 100644
--- a/src/Cockpit/hud_ladr.cxx
+++ b/src/Cockpit/hud_ladr.cxx
@@ -448,8 +448,8 @@ void HudLadder::draw(void)
         LineList.erase();
         StippleLineList.erase();
 
-        int last = FloatToInt(vmax) + 1;
-        int i = FloatToInt(vmin);
+        int last = float_to_int(vmax) + 1;
+        int i = float_to_int(vmin);
 
         if (!scr_hole) {
             x_end = half_span;
diff --git a/src/Cockpit/hud_opts.hxx b/src/Cockpit/hud_opts.hxx
deleted file mode 100644
index b6f7b646e..000000000
--- a/src/Cockpit/hud_opts.hxx
+++ /dev/null
@@ -1,64 +0,0 @@
-// hud_opts.hxx -- hud optimization tools
-//
-// Probably written by Norman Vine, started sometime in 1998 or 1999.
-//
-// Copyright (C) 1999  FlightGear Project
-//
-// 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.
-//
-// $Id$
-
-
-#ifndef _HUD_OPTS_HXX
-#define _HUD_OPTS_HXX
-
-#ifndef __cplusplus
-# error This library requires C++
-#endif
-
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif
-
-#include <simgear/compiler.h>
-
-
-#if defined(i386)
-#define USE_X86_ASM
-#endif
-
-#if defined(USE_X86_ASM)
-static __inline__ int FloatToInt(float f)
-{
-   int r;
-   __asm__ ("fistpl %0" : "=m" (r) : "t" (f) : "st");
-   return r;
-}
-#elif  defined(__MSC__) && defined(__WIN32__)
-static __inline int FloatToInt(float f)
-{
-   int r;
-   _asm {
-     fld f
-     fistp r
-    }
-   return r;
-}
-#else
-#define FloatToInt(F) ((int) ((F) < 0.0f ? (F)-0.5f : (F)+0.5f))
-#endif
-
-
-#endif // _HUD_OPTS_H
diff --git a/src/Cockpit/hud_scal.cxx b/src/Cockpit/hud_scal.cxx
index f2fc6abc5..694a0ea3a 100644
--- a/src/Cockpit/hud_scal.cxx
+++ b/src/Cockpit/hud_scal.cxx
@@ -45,7 +45,7 @@ instr_scale::instr_scale(
     if (show_range < 0)
         range_shown = -range_shown;
 
-    temp = FloatToInt(Maximum_value - Minimum_value) / 100;
+    temp = float_to_int(Maximum_value - Minimum_value) / 100;
     if (range_shown < temp)
         range_shown = temp;
 }