diff --git a/src/plugins/simulator/xplane/simulatorxplane.cpp b/src/plugins/simulator/xplane/simulatorxplane.cpp
index f604431b6..76a89def7 100644
--- a/src/plugins/simulator/xplane/simulatorxplane.cpp
+++ b/src/plugins/simulator/xplane/simulatorxplane.cpp
@@ -485,7 +485,7 @@ namespace BlackSimPlugin
                                         situation.getPitch().value(CAngleUnit::deg()),
                                         situation.getBank().value(CAngleUnit::deg()),
                                         situation.getHeading().value(CAngleUnit::deg()),
-                                        situation.getAdjustedMSecsSinceEpoch()); // fixme sim machine's clock must be synchronized
+                                        situation.getAdjustedMSecsSinceEpoch() - QDateTime::currentMSecsSinceEpoch());
         }
 
         void CSimulatorXPlane::ps_remoteProviderAddAircraftParts(const BlackMisc::Aviation::CCallsign &callsign, const BlackMisc::Aviation::CAircraftParts &parts)
diff --git a/src/plugins/simulator/xplane/xbustrafficproxy.cpp b/src/plugins/simulator/xplane/xbustrafficproxy.cpp
index cf4e5406a..ea3f81fa1 100644
--- a/src/plugins/simulator/xplane/xbustrafficproxy.cpp
+++ b/src/plugins/simulator/xplane/xbustrafficproxy.cpp
@@ -86,9 +86,9 @@ namespace BlackSimPlugin
             m_dbusInterface->callDBus(QLatin1String("removeAllPlanes"));
         }
 
-        void CXBusTrafficProxy::addPlanePosition(const QString &callsign, double latitude, double longitude, double altitude, double pitch, double roll, double heading, qint64 time)
+        void CXBusTrafficProxy::addPlanePosition(const QString &callsign, double latitude, double longitude, double altitude, double pitch, double roll, double heading, qint64 relativeTime)
         {
-            m_dbusInterface->callDBus(QLatin1String("addPlanePosition"), callsign, latitude, longitude, altitude, pitch, roll, heading, time);
+            m_dbusInterface->callDBus(QLatin1String("addPlanePosition"), callsign, latitude, longitude, altitude, pitch, roll, heading, relativeTime);
         }
 
         void CXBusTrafficProxy::setPlaneSurfaces(const QString &callsign, double gear, double flap, double spoiler, double speedBrake, double slat, double wingSweep, double thrust,
diff --git a/src/plugins/simulator/xplane/xbustrafficproxy.h b/src/plugins/simulator/xplane/xbustrafficproxy.h
index 9cbd55609..6dfd987b2 100644
--- a/src/plugins/simulator/xplane/xbustrafficproxy.h
+++ b/src/plugins/simulator/xplane/xbustrafficproxy.h
@@ -103,7 +103,7 @@ namespace BlackSimPlugin
             void removeAllPlanes();
 
             //! \copydoc XBus::CTraffic::addPlanePosition
-            void addPlanePosition(const QString &callsign, double latitude, double longitude, double altitude, double pitch, double roll, double heading, qint64 time);
+            void addPlanePosition(const QString &callsign, double latitude, double longitude, double altitude, double pitch, double roll, double heading, qint64 relativeTime);
 
             //! \copydoc XBus::CTraffic::setPlaneSurfaces
             void setPlaneSurfaces(const QString &callsign, double gear, double flap, double spoiler, double speedBrake, double slat, double wingSweep, double thrust,
diff --git a/src/xbus/traffic.cpp b/src/xbus/traffic.cpp
index 97dc7fa30..1cd753d50 100644
--- a/src/xbus/traffic.cpp
+++ b/src/xbus/traffic.cpp
@@ -249,7 +249,7 @@ namespace XBus
         m_planesById.clear();
     }
 
-    void CTraffic::addPlanePosition(const QString &callsign, double latitude, double longitude, double altitude, double pitch, double roll, double heading, qint64 time)
+    void CTraffic::addPlanePosition(const QString &callsign, double latitude, double longitude, double altitude, double pitch, double roll, double heading, qint64 relativeTime)
     {
         const auto plane = m_planesByCallsign.value(callsign, nullptr);
         if (plane)
@@ -267,7 +267,7 @@ namespace XBus
                 CAngle(roll, CAngleUnit::deg()),
                 CSpeed(0, CSpeedUnit::kts())
             }, maxSituationCount);
-            plane->situations.front().setMSecsSinceEpoch(time);
+            plane->situations.front().setMSecsSinceEpoch(relativeTime + QDateTime::currentMSecsSinceEpoch());
         }
     }
 
diff --git a/src/xbus/traffic.h b/src/xbus/traffic.h
index a4c3a0c9e..0da0155e5 100644
--- a/src/xbus/traffic.h
+++ b/src/xbus/traffic.h
@@ -104,7 +104,7 @@ namespace XBus
         void removeAllPlanes();
 
         //! Set the position of a traffic aircraft
-        void addPlanePosition(const QString &callsign, double latitude, double longitude, double altitude, double pitch, double roll, double heading, qint64 time);
+        void addPlanePosition(const QString &callsign, double latitude, double longitude, double altitude, double pitch, double roll, double heading, qint64 relativeTime);
 
         //! Set the flight control surfaces and lights of a traffic aircraft
         void setPlaneSurfaces(const QString &callsign, double gear, double flap, double spoiler, double speedBrake, double slat, double wingSweep, double thrust,