Index: src/FDM/flight.cxx
===================================================================
RCS file: /var/cvs/FlightGear-0.9/source/src/FDM/flight.cxx,v
retrieving revision 1.28.2.2
diff -B -b -w -U 3 -r1.28.2.2 flight.cxx
--- src/FDM/flight.cxx	13 May 2007 11:53:34 -0000	1.28.2.2
+++ src/FDM/flight.cxx	8 Jun 2007 23:56:55 -0000
@@ -363,6 +363,10 @@
   fgTie("/orientation/yaw-rate-degps", this,
 	&FGInterface::get_Psi_dot_degps);
 
+                // Ground speed knots
+  fgTie("/velocities/groundspeed-kt", this,
+    &FGInterface::get_V_ground_speed_kt);
+
 				// Calibrated airspeed
   fgTie("/velocities/airspeed-kt", this,
 	&FGInterface::get_V_calibrated_kts,
@@ -486,6 +490,7 @@
   fgUntie("/orientation/side-slip-deg");
   fgUntie("/orientation/alpha-deg");
   fgUntie("/velocities/airspeed-kt");
+  fgUntie("/velocities/groundspeed-kt");
   fgUntie("/velocities/mach");
   fgUntie("/velocities/speed-north-fps");
   fgUntie("/velocities/speed-east-fps");
Index: src/FDM/flight.hxx
===================================================================
RCS file: /var/cvs/FlightGear-0.9/source/src/FDM/flight.hxx,v
retrieving revision 1.13.2.1
diff -B -b -w -U 3 -r1.13.2.1 flight.hxx
--- src/FDM/flight.hxx	27 Dec 2006 11:19:58 -0000	1.13.2.1
+++ src/FDM/flight.hxx	8 Jun 2007 23:56:55 -0000
@@ -792,7 +792,7 @@
     // inline void set_V_inertial(double v) { v_inertial = v; }
 
     inline double get_V_ground_speed() const { return v_ground_speed; }
-
+    inline double get_V_ground_speed_kt() const { return v_ground_speed * SG_FEET_TO_METER * 3600 * SG_METER_TO_NM; }
     // inline double get_V_equiv() const { return v_equiv; }
     // inline void set_V_equiv( double v ) { v_equiv = v; }