diff --git a/src/Autopilot/newauto.cxx b/src/Autopilot/newauto.cxx
index 8258136e9..b18b00423 100644
--- a/src/Autopilot/newauto.cxx
+++ b/src/Autopilot/newauto.cxx
@@ -519,12 +519,12 @@ FGAutopilot::update (double dt)
 
 	    // determine our current radial position relative to the
 	    // navaid in "true" heading.
-	    double cur_radial = current_radiostack->get_navcom1()->get_nav_heading();
+	    double cur_radial = current_radiostack->get_navcom1()->get_nav_reciprocal_radial();
 	    if ( current_radiostack->get_navcom1()->get_nav_loc() ) {
 		// ILS localizers radials are already "true" in our
 		// database
 	    } else {
-		cur_radial += current_radiostack->get_navcom1()->get_nav_magvar();
+		cur_radial += current_radiostack->get_navcom1()->get_nav_twist();
 	    }
 	    if ( current_radiostack->get_navcom1()->get_nav_from_flag() ) {
 		cur_radial += 180.0;
@@ -538,18 +538,18 @@ FGAutopilot::update (double dt)
 		// database
 	    } else {
 		// VOR radials need to have that vor's offset added in
-		tgt_radial += current_radiostack->get_navcom1()->get_nav_magvar();
+		tgt_radial += current_radiostack->get_navcom1()->get_nav_twist();
 	    }
 
 	    // determine the heading adjustment needed.
 	    double adjustment = 
-		current_radiostack->get_navcom1()->get_nav_heading_needle_deflection()
+		current_radiostack->get_navcom1()->get_nav_cdi_deflection()
 		* (current_radiostack->get_navcom1()->get_nav_loc_dist() * SG_METER_TO_NM);
 	    SG_CLAMP_RANGE( adjustment, -30.0, 30.0 );
 
             // clamp closer when inside cone when beyond 5km...
             if (current_radiostack->get_navcom1()->get_nav_loc_dist() > 5000) {
-              double clamp_angle = fabs(current_radiostack->get_navcom1()->get_nav_heading_needle_deflection()) * 3;
+              double clamp_angle = fabs(current_radiostack->get_navcom1()->get_nav_cdi_deflection()) * 3;
               if (clamp_angle < 30)
                 SG_CLAMP_RANGE( adjustment, -clamp_angle, clamp_angle);
             }
diff --git a/src/Cockpit/navcom.cxx b/src/Cockpit/navcom.cxx
index e709c4471..c74dce0fb 100644
--- a/src/Cockpit/navcom.cxx
+++ b/src/Cockpit/navcom.cxx
@@ -59,7 +59,7 @@ FGNavCom::FGNavCom() :
     comm_vol_btn(0.0),
     nav_freq(0.0),
     nav_alt_freq(0.0),
-    nav_radial(0.0),
+    nav_target_radial(0.0),
     nav_vol_btn(0.0),
     nav_ident_btn(true)
 {
@@ -193,13 +193,13 @@ FGNavCom::bind ()
     fgTie( propname, this, &FGNavCom::get_nav_inrange );
 
     snprintf(propname, 256, "/radios/nav[%d]/heading-needle-deflection", index);
-    fgTie( propname, this, &FGNavCom::get_nav_heading_needle_deflection );
+    fgTie( propname, this, &FGNavCom::get_nav_cdi_deflection );
 
     snprintf(propname, 256, "/radios/nav[%d]/has-gs", index);
     fgTie( propname, this, &FGNavCom::get_nav_has_gs );
 
     snprintf(propname, 256, "/radios/nav[%d]/gs-needle-deflection", index);
-    fgTie( propname, this, &FGNavCom::get_nav_gs_needle_deflection );
+    fgTie( propname, this, &FGNavCom::get_nav_gs_deflection );
 
     snprintf(propname, 256, "/radios/nav[%d]/nav-id", index);
     fgTie( propname, this, &FGNavCom::get_nav_id );
@@ -364,7 +364,7 @@ FGNavCom::update(double dt)
                                 lon * SGD_RADIANS_TO_DEGREES, 
                                 nav_gslat, nav_gslon,
                                 &az1, &az2, &s );
-            double r = az1 - nav_radial;
+            double r = az1 - nav_target_radial;
             while ( r >  180.0 ) { r -= 360.0;}
             while ( r < -180.0 ) { r += 360.0;}
             if ( r >= -90.0 && r <= 90.0 ) {
@@ -372,7 +372,7 @@ FGNavCom::update(double dt)
             } else {
                 nav_gs_dist_signed = -nav_gs_dist;
             }
-            /* cout << "Target Radial = " << nav_radial 
+            /* cout << "Target Radial = " << nav_target_radial 
                  << "  Bearing = " << az1
                  << "  dist (signed) = " << nav_gs_dist_signed
                  << endl; */
@@ -388,12 +388,12 @@ FGNavCom::update(double dt)
 			    nav_loclat, nav_loclon,
 			    &az1, &az2, &s );
 	// cout << "az1 = " << az1 << " magvar = " << nav_magvar << endl;
-	nav_heading = az1 - nav_magvar;
+	nav_radial = az2 - nav_twist;
 	// cout << " heading = " << nav_heading
 	//      << " dist = " << nav_dist << endl;
 
 	if ( nav_loc ) {
-	    double offset = nav_heading - nav_radial;
+	    double offset = nav_radial - nav_target_radial;
 	    while ( offset < -180.0 ) { offset += 360.0; }
 	    while ( offset > 180.0 ) { offset -= 360.0; }
 	    // cout << "ils offset = " << offset << endl;
@@ -416,7 +416,7 @@ FGNavCom::update(double dt)
 	}
 
 	if ( !nav_loc ) {
-	    nav_radial = nav_sel_radial;
+	    nav_target_radial = nav_sel_radial;
 	}
     } else {
 	nav_inrange = false;
@@ -508,13 +508,13 @@ void FGNavCom::search()
 	    nav_gslon = ils->get_gslon();
 	    nav_gslat = ils->get_gslat();
 	    nav_elev = ils->get_gselev();
-	    nav_magvar = 0;
+	    nav_twist = 0;
 	    nav_range = FG_ILS_DEFAULT_RANGE;
 	    nav_effective_range = nav_range;
 	    nav_target_gs = ils->get_gsangle();
-	    nav_radial = ils->get_locheading();
-	    while ( nav_radial <   0.0 ) { nav_radial += 360.0; }
-	    while ( nav_radial > 360.0 ) { nav_radial -= 360.0; }
+	    nav_target_radial = ils->get_locheading();
+	    while ( nav_target_radial <   0.0 ) { nav_target_radial += 360.0; }
+	    while ( nav_target_radial > 360.0 ) { nav_target_radial -= 360.0; }
 	    nav_x = ils->get_x();
 	    nav_y = ils->get_y();
 	    nav_z = ils->get_z();
@@ -524,7 +524,7 @@ void FGNavCom::search()
 
             // derive GS baseline
             double tlon, tlat, taz;
-            geo_direct_wgs_84 ( 0.0, nav_gslat, nav_gslon, nav_radial + 90,  
+            geo_direct_wgs_84 ( 0.0, nav_gslat, nav_gslon, nav_target_radial + 90,  
                                 100.0, &tlat, &tlon, &taz );
             // cout << nav_gslon << "," << nav_gslat << "  "
             //      << tlon << "," << tlat << "  (" << nav_elev << ")" << endl;
@@ -579,11 +579,11 @@ void FGNavCom::search()
 	    nav_loclon = nav->get_lon();
 	    nav_loclat = nav->get_lat();
 	    nav_elev = nav->get_elev();
-	    nav_magvar = nav->get_magvar();
+	    nav_twist = nav->get_magvar();
 	    nav_range = nav->get_range();
 	    nav_effective_range = adjustNavRange(nav_elev, elev, nav_range);
 	    nav_target_gs = 0.0;
-	    nav_radial = nav_sel_radial;
+	    nav_target_radial = nav_sel_radial;
 	    nav_x = nav->get_x();
 	    nav_y = nav->get_y();
 	    nav_z = nav->get_z();
@@ -622,7 +622,7 @@ void FGNavCom::search()
     } else {
 	nav_valid = false;
 	nav_id = "";
-	nav_radial = 0;
+	nav_target_radial = 0;
 	nav_trans_ident = "";
 	last_nav_id = "";
 	if ( ! globals->get_soundmgr()->remove( nav_fx_name ) ) {
@@ -636,15 +636,15 @@ void FGNavCom::search()
 
 // return the amount of heading needle deflection, returns a value
 // clamped to the range of ( -10 , 10 )
-double FGNavCom::get_nav_heading_needle_deflection() const {
+double FGNavCom::get_nav_cdi_deflection() const {
     double r;
 
     if ( nav_inrange
          && nav_servicable->getBoolValue() && cdi_servicable->getBoolValue() )
     {
-        r = nav_heading - nav_radial;
-	// cout << "Radial = " << nav_radial 
-	//      << "  Bearing = " << nav_heading << endl;
+        r = nav_radial - nav_target_radial;
+	// cout << "Target radial = " << nav_target_radial 
+	//      << "  Actual radial = " << nav_radial << endl;
     
 	while ( r >  180.0 ) { r -= 360.0;}
 	while ( r < -180.0 ) { r += 360.0;}
@@ -652,6 +652,7 @@ double FGNavCom::get_nav_heading_needle_deflection() const {
 	    r = ( r<0.0 ? -r-180.0 : -r+180.0 );
 
 	// According to Robin Peel, the ILS is 4x more sensitive than a vor
+        r = -r;                 // reverse, since radial is outbound
 	if ( nav_loc ) { r *= 4.0; }
 	if ( r < -10.0 ) { r = -10.0; }
 	if ( r >  10.0 ) { r = 10.0; }
@@ -665,7 +666,7 @@ double FGNavCom::get_nav_heading_needle_deflection() const {
 
 // return the amount of glide slope needle deflection (.i.e. the
 // number of degrees we are off the glide slope * 5.0
-double FGNavCom::get_nav_gs_needle_deflection() const {
+double FGNavCom::get_nav_gs_deflection() const {
     if ( nav_inrange && nav_has_gs
          && nav_servicable->getBoolValue() && gs_servicable->getBoolValue() )
     {
@@ -691,11 +692,11 @@ FGNavCom::get_nav_to_flag () const
          && nav_servicable->getBoolValue()
          && tofrom_servicable->getBoolValue() )
     {
-        double offset = fabs(nav_heading - nav_radial);
+        double offset = fabs(nav_radial - nav_target_radial);
         if (nav_loc) {
             return true;
         } else {
-            return (offset <= 90.0 || offset >= 270.0);
+            return !(offset <= 90.0 || offset >= 270.0);
         }
     } else {
         return false;
@@ -712,11 +713,11 @@ FGNavCom::get_nav_from_flag () const
     if ( nav_inrange
          && nav_servicable->getBoolValue()
          && tofrom_servicable->getBoolValue() ) {
-        double offset = fabs(nav_heading - nav_radial);
+        double offset = fabs(nav_radial - nav_target_radial);
         if (nav_loc) {
             return false;
         } else {
-          return (offset > 90.0 && offset < 270.0);
+          return !(offset > 90.0 && offset < 270.0);
         }
     } else {
         return false;
@@ -726,20 +727,18 @@ FGNavCom::get_nav_from_flag () const
 
 /**
  * Return the current radial.
- *
- * FIXME: the variable 'nav_radial' does not contain the current
- * radial, while the variable 'nav_heading' contains the reciprocal of
- * the current radial.
  */
 double
 FGNavCom::get_nav_radial () const
 {
-    if (nav_inrange && nav_servicable->getBoolValue()) {
-        double radial = nav_heading + 180;
-        if (radial >= 360)
-            radial -= 360;
-        return radial;
-    } else {
-        return 0.0;
-    }
+    return nav_radial;
+}
+
+double
+FGNavCom::get_nav_reciprocal_radial () const
+{
+    double recip = nav_radial + 180;
+    if (recip >= 360)
+        recip = 360;
+    return recip;
 }
diff --git a/src/Cockpit/navcom.hxx b/src/Cockpit/navcom.hxx
index 2e27c20a6..35bdf6cba 100644
--- a/src/Cockpit/navcom.hxx
+++ b/src/Cockpit/navcom.hxx
@@ -91,6 +91,7 @@ class FGNavCom : public FGSubsystem
     double nav_alt_freq;
     double nav_radial;
     double nav_sel_radial;
+    double nav_target_radial;
     double nav_loclon;
     double nav_loclat;
     double nav_x;
@@ -110,9 +111,8 @@ class FGNavCom : public FGSubsystem
     double nav_elev;
     double nav_range;
     double nav_effective_range;
-    double nav_heading;
     double nav_target_gs;
-    double nav_magvar;
+    double nav_twist;
     double nav_vol_btn;
     bool nav_ident_btn;
 
@@ -189,6 +189,7 @@ public:
     inline double get_nav_freq () const { return nav_freq; }
     inline double get_nav_alt_freq () const { return nav_alt_freq; }
     inline double get_nav_sel_radial() const { return nav_sel_radial; }
+    inline double get_nav_target_radial() const { return nav_target_radial; }
 
     // Calculated values.
     inline bool get_comm_inrange() const { return comm_inrange; }
@@ -212,12 +213,12 @@ public:
     inline double get_nav_gs_dist() const { return nav_gs_dist; }
     inline double get_nav_gs_dist_signed() const { return nav_gs_dist_signed; }
     inline double get_nav_elev() const { return nav_elev; }
-    inline double get_nav_heading() const { return nav_heading; }
-    inline double get_nav_radial() const;
+    double get_nav_radial() const;
+    double get_nav_reciprocal_radial() const;
     inline double get_nav_target_gs() const { return nav_target_gs; }
-    inline double get_nav_magvar() const { return nav_magvar; }
-    double get_nav_heading_needle_deflection() const;
-    double get_nav_gs_needle_deflection() const;
+    inline double get_nav_twist() const { return nav_twist; }
+    double get_nav_cdi_deflection() const;
+    double get_nav_gs_deflection() const;
     inline double get_nav_vol_btn() const { return nav_vol_btn; }
     inline bool get_nav_ident_btn() const { return nav_ident_btn; }
     inline const char * get_nav_id() const { return nav_id.c_str(); }
diff --git a/src/Network/native_gui.cxx b/src/Network/native_gui.cxx
index a681be59e..748a50096 100644
--- a/src/Network/native_gui.cxx
+++ b/src/Network/native_gui.cxx
@@ -152,7 +152,7 @@ void FGProps2NetGUI( FGNetGUI *net ) {
 
     // Approach
     net->tuned_freq = current_radiostack->get_navcom1()->get_nav_freq();
-    net->nav_radial = current_radiostack->get_navcom1()->get_nav_radial();
+    net->nav_radial = current_radiostack->get_navcom1()->get_nav_target_radial();
     net->in_range = current_radiostack->get_navcom1()->get_nav_inrange();
 
     if ( current_radiostack->get_navcom1()->get_nav_loc() ) {
@@ -167,8 +167,8 @@ void FGProps2NetGUI( FGNetGUI *net ) {
     }
 
     net->course_deviation_deg
-        = current_radiostack->get_navcom1()->get_nav_heading()
-        - current_radiostack->get_navcom1()->get_nav_radial();
+        = current_radiostack->get_navcom1()->get_nav_reciprocal_radial()
+        - current_radiostack->get_navcom1()->get_nav_target_radial();
     while ( net->course_deviation_deg >  180.0 ) {
         net->course_deviation_deg -= 360.0;
     }
@@ -184,7 +184,7 @@ void FGProps2NetGUI( FGNetGUI *net ) {
     if ( current_radiostack->get_navcom1()->get_nav_loc() ) {
         // is an ILS
         net->gs_deviation_deg
-            = current_radiostack->get_navcom1()->get_nav_gs_needle_deflection()
+            = current_radiostack->get_navcom1()->get_nav_gs_deflection()
             / 5.0;
     } else {
         // is an ILS