diff --git a/KerbalEngineer/Flight/Readouts/Rendezvous/RendezvousProcessor.cs b/KerbalEngineer/Flight/Readouts/Rendezvous/RendezvousProcessor.cs
index a26d9827..b570f58a 100644
--- a/KerbalEngineer/Flight/Readouts/Rendezvous/RendezvousProcessor.cs
+++ b/KerbalEngineer/Flight/Readouts/Rendezvous/RendezvousProcessor.cs
@@ -182,7 +182,16 @@ public void Update()
                 : FlightGlobals.ship_orbit.referenceBody.orbit;
 
             RelativeInclination = originOrbit.GetRelativeInclination(targetOrbit);
-            RelativeVelocity = FlightGlobals.ship_tgtSpeed;
+
+            if (targetOrbit.referenceBody == FlightGlobals.ship_orbit.referenceBody)
+            {
+                RelativeVelocity = FlightGlobals.ship_tgtSpeed;
+            }
+            else
+            {
+                RelativeVelocity = (FlightGlobals.ship_orbit.GetFrameVel() - targetOrbit.GetFrameVel()).magnitude;
+            }
+
             RelativeSpeed = FlightGlobals.ship_obtSpeed - targetOrbit.orbitalSpeed;
             PhaseAngle = originOrbit.GetPhaseAngle(targetOrbit);
             InterceptAngle = CalcInterceptAngle(targetOrbit, originOrbit);
@@ -229,4 +238,4 @@ private Vector3d GetDescendingNode(Orbit targetOrbit, Orbit originOrbit)
             return Vector3d.Cross(originOrbit.GetOrbitNormal(), targetOrbit.GetOrbitNormal());
         }
     }
-}
\ No newline at end of file
+}