diff --git a/src/blackmisc/simulation/interpolator.cpp b/src/blackmisc/simulation/interpolator.cpp
index 0f34db691..516558d64 100644
--- a/src/blackmisc/simulation/interpolator.cpp
+++ b/src/blackmisc/simulation/interpolator.cpp
@@ -110,6 +110,8 @@ namespace BlackMisc
                 status.setChangedPosition(true);
             }
             status.setInterpolationSucceeded(true);
+            m_isFirstInterpolation = false;
+
             if (m_logger && hints.isLoggingInterpolation())
             {
                 log.timestamp = currentTimeMsSinceEpoc;
diff --git a/src/blackmisc/simulation/interpolator.h b/src/blackmisc/simulation/interpolator.h
index bfebf95de..71942bc4c 100644
--- a/src/blackmisc/simulation/interpolator.h
+++ b/src/blackmisc/simulation/interpolator.h
@@ -74,6 +74,7 @@ namespace BlackMisc
             BlackMisc::Aviation::CAircraftSituationList m_aircraftSituations; //!< recent situations
             BlackMisc::Aviation::CAircraftPartsList m_aircraftParts;          //!< recent parts
             BlackMisc::Aviation::CCallsign m_callsign;                        //!< callsign
+            bool m_isFirstInterpolation = true;                               //!< set to false after the first successful interpolation
 
             //! Constructor
             CInterpolator(const QString &objectName, const BlackMisc::Aviation::CCallsign &callsign, QObject *parent);
diff --git a/src/blackmisc/simulation/interpolatorlinear.cpp b/src/blackmisc/simulation/interpolatorlinear.cpp
index 93d8803f9..b7c84d41d 100644
--- a/src/blackmisc/simulation/interpolatorlinear.cpp
+++ b/src/blackmisc/simulation/interpolatorlinear.cpp
@@ -114,7 +114,7 @@ namespace BlackMisc
             currentSituation.setTimeOffsetMs(oldSituation.getTimeOffsetMs() + (newSituation.getTimeOffsetMs() - oldSituation.getTimeOffsetMs()) * simulationTimeFraction);
             currentSituation.setMSecsSinceEpoch(oldSituation.getMSecsSinceEpoch() + deltaTimeFractionMs);
 
-            status.setChangedPosition(oldSituation.getPosition() != newSituation.getPosition() || oldSituation.getAltitude() != newSituation.getAltitude());
+            status.setChangedPosition(m_isFirstInterpolation || oldSituation.getPosition() != newSituation.getPosition() || oldSituation.getAltitude() != newSituation.getAltitude());
             status.setInterpolationSucceeded(true);
 
             log.oldSituation = oldSituation;