diff --git a/src/blackcore/simulatorcommon.cpp b/src/blackcore/simulatorcommon.cpp
index a9d5ca98a..6499a6e36 100644
--- a/src/blackcore/simulatorcommon.cpp
+++ b/src/blackcore/simulatorcommon.cpp
@@ -104,7 +104,7 @@ namespace BlackCore
         Q_ASSERT_X(remoteAircraft.hasModelString(), Q_FUNC_INFO, "Missing model string");
         Q_ASSERT_X(remoteAircraft.hasCallsign(), Q_FUNC_INFO, "Missing callsign");
 
-        const bool renderingRestricted = m_interpolationRenderingSetup.isRenderingRestricted();
+        const bool renderingRestricted = this->getInterpolationAndRenderingSetup().isRenderingRestricted();
         if (this->showDebugLogMessage()) { this->debugLogMessage(Q_FUNC_INFO, QString("Restricted: %1 cs: '%2' enabled: %3").arg(boolToYesNo(renderingRestricted), remoteAircraft.getCallsignAsString(), boolToYesNo(remoteAircraft.isEnabled()))); }
         if (!remoteAircraft.isEnabled()) { return false; }
 
@@ -118,7 +118,7 @@ namespace BlackCore
     bool CSimulatorCommon::logicallyRemoveRemoteAircraft(const CCallsign &callsign)
     {
         // if not restriced, directly change
-        if (!m_interpolationRenderingSetup.isRenderingRestricted())
+        if (!this->getInterpolationAndRenderingSetup().isRenderingRestricted())
         {
             m_statsPhysicallyAddedAircraft++;
             this->callPhysicallyRemoveRemoteAircraft(callsign); return true;
@@ -224,7 +224,7 @@ namespace BlackCore
 
     bool CSimulatorCommon::showDebugLogMessage() const
     {
-        return m_interpolationRenderingSetup.showSimulatorDebugMessages();
+        return this->getInterpolationAndRenderingSetup().showSimulatorDebugMessages();
     }
 
     void CSimulatorCommon::reverseLookupAndUpdateOwnAircraftModel(const BlackMisc::Simulation::CAircraftModel &model)
@@ -452,6 +452,8 @@ namespace BlackCore
             {
                 m_interpolationLogger.clearLog();
                 CStatusMessage(this).info("Cleared interpolation logging");
+                QWriteLocker l(&m_interpolationRenderingSetupMutex);
+                m_interpolationRenderingSetup.clearInterpolatorLogCallsigns();
                 return true;
             }
             if (part2.startsWith("max"))
@@ -492,18 +494,18 @@ namespace BlackCore
                 return true;
             }
 
-            const QString cs = part2.toUpper();
-            if (!CCallsign::isValidAircraftCallsign(cs)) { return false; }
+            const CCallsign cs(part2.toUpper());
+            if (!cs.isValid()) { return false; }
             if (this->getAircraftInRangeCallsigns().contains(cs))
             {
-                CLogMessage(this).info("Will log interpolation for '%1'") << cs;
+                CLogMessage(this).info("Will log interpolation for '%1'") << cs.asString();
                 QWriteLocker l(&m_interpolationRenderingSetupMutex);
-                m_interpolationRenderingSetup.addCallsignToLog(CCallsign(cs));
+                m_interpolationRenderingSetup.addCallsignToLog(cs);
                 return true;
             }
             else
             {
-                CLogMessage(this).warning("Cannot log interpolation for '%1', no aircraft in range") << cs;
+                CLogMessage(this).warning("Cannot log interpolation for '%1', no aircraft in range") << cs.asString();
                 return false;
             }
         } // logint
@@ -520,18 +522,31 @@ namespace BlackCore
 
         if (part1.startsWith("pos"))
         {
-            const QString cs = parser.part(2).toUpper();
-            if (!CCallsign::isValidAircraftCallsign(cs)) { return false; }
-            if (this->getAircraftInRangeCallsigns().contains(cs) && m_interpolationRenderingSetup.getLogCallsigns().containsCallsign(cs))
+            CCallsign cs(parser.part(2).toUpper());
+            const CInterpolationAndRenderingSetup s = this->getInterpolationAndRenderingSetup();
+            if (!cs.isValid())
             {
-                CAircraftSituation s = m_interpolationLogger.getLastSituation(cs);
-                if (!s.getPosition().isNull())
-                {
-                    this->displayStatusMessage(CStatusMessage(this).info(s.toQString(true)));
-                }
-                return true;
+
+                if (s.getLogCallsigns().size() != 1) { return false; }
+
+                // if there is just one we take that one
+                cs = s.getLogCallsigns().toQList().front();
             }
-            return false;
+
+            bool addedCallsign = false;
+            {
+                const bool isLoggedCallsign = s.isLogCallsign(cs);
+                QWriteLocker l(&m_interpolationRenderingSetupMutex);
+                if (!isLoggedCallsign)
+                {
+                    m_interpolationRenderingSetup.addCallsignToLog(cs);
+                    addedCallsign = true;
+                }
+            }
+
+            CLogMessage(this).info("Display position for '%1'") << cs.asString();
+            this->displayLoggedSituationInSimulator(cs, addedCallsign);
+            return true;
         }
 
         if (parser.hasPart(2) && (part1.startsWith("aircraft") || part1.startsWith("ac")))
@@ -582,11 +597,11 @@ namespace BlackCore
         CSimpleCommandParser::registerCommand({".drv logint off", "no log information for interpolator"});
         CSimpleCommandParser::registerCommand({".drv logint write", "write interpolator log to file"});
         CSimpleCommandParser::registerCommand({".drv logint clear", "clear current log"});
-        CSimpleCommandParser::registerCommand({".drv logint max number", "max.number of entries logged"});
+        CSimpleCommandParser::registerCommand({".drv logint max number", "max. number of entries logged"});
         CSimpleCommandParser::registerCommand({".drv pos callsign", "show position for callsign"});
         CSimpleCommandParser::registerCommand({".drv spline|linear callsign", "set spline/linear interpolator for one/all callsign(s)"});
-        CSimpleCommandParser::registerCommand({".drv aircraft readd callsign", "add again a given callsign"});
-        CSimpleCommandParser::registerCommand({".drv aircraft readd all", "add again all aircraft"});
+        CSimpleCommandParser::registerCommand({".drv aircraft readd callsign", "add again (re-add) a given callsign"});
+        CSimpleCommandParser::registerCommand({".drv aircraft readd all", "add again (re-add) all aircraft"});
         CSimpleCommandParser::registerCommand({".drv aircraft rm callsign", "remove a given callsign"});
     }
 
@@ -769,4 +784,41 @@ namespace BlackCore
         m_statsPhysicallyRemovedAircraft++;
         this->physicallyRemoveRemoteAircraft(remoteCallsign);
     }
+
+    void CSimulatorCommon::displayLoggedSituationInSimulator(const CCallsign &cs, bool stopLogging, int times)
+    {
+        if (cs.isEmpty()) { return; }
+        if (this->isShuttingDown()) { return; }
+        const CInterpolationAndRenderingSetup setup = this->getInterpolationAndRenderingSetup();
+        const bool logsCs = setup.isLogCallsign(cs);
+        if (!logsCs) { return; }
+
+        stopLogging = stopLogging || !this->isSimulating(); // stop when sim was stopped
+        stopLogging = stopLogging && logsCs;
+        if (!stopLogging && times < 1) { return; }
+
+        const bool inRange = this->getAircraftInRangeCallsigns().contains(cs);
+        if (!stopLogging && !inRange) { return; }
+        if (stopLogging && (times < 1 || !inRange))
+        {
+            QWriteLocker wl(&m_interpolationRenderingSetupMutex);
+            m_interpolationRenderingSetup.removeCallsignFromLog(cs);
+            return;
+        }
+
+        const CInterpolationLogger::SituationLog s = m_interpolationLogger.getLastSituationLog(cs);
+        const CInterpolationLogger::PartsLog p = m_interpolationLogger.getLastPartsLog(cs);
+
+        QString dm;
+        static const QString sep("\n");
+        if (s.tsCurrent > 0) { dm = QStringLiteral("Situation: ") % s.toQString(true, true, true, true, true, true, sep); }
+        if (p.tsCurrent > 0) { dm += (dm.isEmpty() ? QStringLiteral("") : "\n\n") % QStringLiteral("Parts: ") % p.toQString(sep); }
+        if (!dm.isEmpty()) { this->displayStatusMessage(CStatusMessage(this).info(dm)); }
+
+        const int t = 4500 + (qrand() % 1000); // makes sure not always using the same time difference
+        QTimer::singleShot(t, this, [ = ]
+        {
+            this->displayLoggedSituationInSimulator(cs, stopLogging, times - 1);
+        });
+    }
 } // namespace
diff --git a/src/blackcore/simulatorcommon.h b/src/blackcore/simulatorcommon.h
index 5d9469d90..c6c02d560 100644
--- a/src/blackcore/simulatorcommon.h
+++ b/src/blackcore/simulatorcommon.h
@@ -231,15 +231,16 @@ namespace BlackCore
         BlackMisc::Simulation::CAircraftModel m_defaultModel;              //!< default model
         BlackMisc::Simulation::CSimulatorInternals m_simulatorInternals;   //!< setup object
         BlackMisc::Simulation::CInterpolationLogger m_interpolationLogger; //!< log interpolation
-        mutable QReadWriteLock m_interpolationRenderingSetupMutex;         //!< mutex protecting setup object
 
-        // setup for debugging, logs ..
+        // setup for logging etc.
+        mutable QReadWriteLock m_interpolationRenderingSetupMutex; //!< mutex protecting setup object
         BlackMisc::Simulation::CInterpolationAndRenderingSetup m_interpolationRenderingSetup; //!< logging, rendering etc.
 
         // some optional functionality which can be used by the simulators as needed
         BlackMisc::Simulation::CSimulatedAircraftList m_addAgainAircraftWhenRemoved; //!< add this model again when removed, normally used to change model
         QHash<BlackMisc::Aviation::CCallsign, BlackMisc::Simulation::CInterpolationHints> m_hints; //!< hints for callsign, contains last ground elevation fetched
 
+        // weather
         bool m_isWeatherActivated = false;                         //!< Is simulator weather activated?
         BlackMisc::Geo::CCoordinateGeodetic m_lastWeatherPosition; //!< Own aircraft position at which weather was fetched and injected last
         BlackMisc::CSetting<BlackMisc::Simulation::Settings::TSelectedWeatherScenario> m_weatherScenarioSettings { this, &CSimulatorCommon::reloadWeatherSettings }; //!< Selected weather scenario
@@ -258,6 +259,9 @@ namespace BlackCore
         void callPhysicallyAddRemoteAircraft(const BlackMisc::Simulation::CSimulatedAircraft &remoteAircraft);
         void callPhysicallyRemoveRemoteAircraft(const BlackMisc::Aviation::CCallsign &remoteCallsign);
 
+        //! Display a logged situation in simulator
+        void displayLoggedSituationInSimulator(const BlackMisc::Aviation::CCallsign &cs, bool stopLogging, int times = 10);
+
         bool m_blinkCycle = false;            //!< used for highlighting
         qint64 m_highlightEndTimeMsEpoch = 0; //!< end highlighting
         int m_timerCounter = 0;               //!< allows to calculate n seconds
@@ -269,10 +273,10 @@ namespace BlackCore
 
         // statistics values of how often those functions are called
         // those are the added counters, overflow will not be an issue here (discussed in T171 review)
-        int  m_statsPhysicallyAddedAircraft = 0;   //!< statistics, how many aircraft added
-        int  m_statsPhysicallyRemovedAircraft = 0; //!< statistics, how many aircraft removed
-        int  m_statsPartsAdded = 0;                //!< statistics, how many aircraft parts added
-        int  m_statsSituationAdded = 0;            //!< statistics, how many situations added
+        int m_statsPhysicallyAddedAircraft = 0;   //!< statistics, how many aircraft added
+        int m_statsPhysicallyRemovedAircraft = 0; //!< statistics, how many aircraft removed
+        int m_statsPartsAdded = 0;                //!< statistics, how many aircraft parts added
+        int m_statsSituationAdded = 0;            //!< statistics, how many situations added
     };
 } // namespace
 
diff --git a/src/blackmisc/simulation/interpolationhints.cpp b/src/blackmisc/simulation/interpolationhints.cpp
index 1b9729f51..1af84ed81 100644
--- a/src/blackmisc/simulation/interpolationhints.cpp
+++ b/src/blackmisc/simulation/interpolationhints.cpp
@@ -36,6 +36,15 @@ namespace BlackMisc
             return validPlane ? this->m_elevationPlane.getAltitude() : CAltitude::null();
         }
 
+        CAltitude CInterpolationHints::getGroundElevation(const CAircraftSituation &situation, const CLength &validRadius, bool useProvider, bool forceProvider) const
+        {
+            const bool validPlane = m_elevationPlane.isWithinRange(situation, CLength::maxValue(validRadius, m_elevationPlane.getRadius()));
+            Q_ASSERT_X(!(forceProvider && !useProvider), Q_FUNC_INFO, "Invalid parameter combination");
+            if (forceProvider && useProvider && m_elevationProvider) { return m_elevationProvider(situation); }
+            if (!validPlane   && useProvider && m_elevationProvider) { return m_elevationProvider(situation); }
+            return validPlane ? this->m_elevationPlane.getAltitude() : CAltitude::null();
+        }
+
         void CInterpolationHints::resetElevationPlane()
         {
             m_elevationPlane = CElevationPlane();
diff --git a/src/blackmisc/simulation/interpolationhints.h b/src/blackmisc/simulation/interpolationhints.h
index 85831ef6e..6b2e22b19 100644
--- a/src/blackmisc/simulation/interpolationhints.h
+++ b/src/blackmisc/simulation/interpolationhints.h
@@ -63,6 +63,10 @@ namespace BlackMisc
             //! \see setElevationPlane
             Aviation::CAltitude getGroundElevation(const Aviation::CAircraftSituation &situation, bool useProvider, bool forceProvider = false) const;
 
+            //! Get elevation from CInterpolationHints::getElevationProvider or CInterpolationHints::getElevation
+            //! \remark if validRadius is >= Geo::CElevationPlane::radius use validRadius
+            Aviation::CAltitude getGroundElevation(const Aviation::CAircraftSituation &situation, const PhysicalQuantities::CLength &validRadius, bool useProvider, bool forceProvider = false) const;
+
             //! Check if elevation is within radius and can be used
             bool isWithinRange(const Geo::ICoordinateGeodetic &coordinate) const;
 
diff --git a/src/blackmisc/simulation/interpolationlogger.cpp b/src/blackmisc/simulation/interpolationlogger.cpp
index b230d3986..66ca6579f 100644
--- a/src/blackmisc/simulation/interpolationlogger.cpp
+++ b/src/blackmisc/simulation/interpolationlogger.cpp
@@ -186,18 +186,32 @@ namespace BlackMisc
             return logs;
         }
 
+        CInterpolationLogger::SituationLog CInterpolationLogger::getLastSituationLog() const
+        {
+            QReadLocker l(&m_lockSituations);
+            if (m_situationLogs.isEmpty()) { return SituationLog(); }
+            return m_situationLogs.last();
+        }
+
+        CInterpolationLogger::SituationLog CInterpolationLogger::getLastSituationLog(const CCallsign &cs) const
+        {
+            const QList<SituationLog> copy(this->getSituationsLog(cs));
+            if (copy.isEmpty()) { return SituationLog(); }
+            return copy.last();
+        }
+
         CAircraftSituation CInterpolationLogger::getLastSituation() const
         {
             QReadLocker l(&m_lockSituations);
             if (m_situationLogs.isEmpty()) { return CAircraftSituation(); }
-            return m_situationLogs.last().currentSituation;
+            return m_situationLogs.last().situationCurrent;
         }
 
         CAircraftSituation CInterpolationLogger::getLastSituation(const CCallsign &cs) const
         {
             const QList<SituationLog> copy(this->getSituationsLog(cs));
             if (copy.isEmpty()) { return CAircraftSituation(); }
-            return copy.last().currentSituation;
+            return copy.last().situationCurrent;
         }
 
         CAircraftParts CInterpolationLogger::getLastParts() const
@@ -214,6 +228,20 @@ namespace BlackMisc
             return copy.last().parts;
         }
 
+        CInterpolationLogger::PartsLog CInterpolationLogger::getLastPartsLog() const
+        {
+            QReadLocker l(&m_lockParts);
+            if (m_partsLogs.isEmpty()) { return PartsLog(); }
+            return m_partsLogs.last();
+        }
+
+        CInterpolationLogger::PartsLog CInterpolationLogger::getLastPartsLog(const CCallsign &cs) const
+        {
+            const QList<PartsLog> copy(this->getPartsLog(cs));
+            if (copy.isEmpty()) { return PartsLog(); }
+            return copy.last();
+        }
+
         const QString &CInterpolationLogger::filePatternInterpolationLog()
         {
             static const QString p("*interpolation.html");
@@ -235,113 +263,113 @@ namespace BlackMisc
         QString CInterpolationLogger::getHtmlInterpolationLog(const QList<SituationLog> &logs)
         {
             if (logs.isEmpty()) { return {}; }
-            const QString tableHeader =
-                QLatin1String("<thead><tr>") %
-                QLatin1String("<th title=\"changed situation\">cs.</th><th>Int</th>") %
-                QLatin1String("<th>CS</th><th>VTOL</th><th>timestamp</th><th>since</th>") %
-                QLatin1String("<th>ts old</th><th>ts new</th><th>ts cur</th>") %
-                QLatin1String("<th>&Delta;t</th><th>&Delta;t fr.</th><th>fraction</th>") %
-                QLatin1String("<th>lat.old</th><th>lat.new</th><th>lat.cur</th>") %
-                QLatin1String("<th>lng.old</th><th>lng.new</th><th>lng.cur</th>") %
-                QLatin1String("<th>alt.old</th><th>alt.new</th><th>alt.cur</th>") %
-                QLatin1String("<th>elv.old</th><th>elv.new</th><th>elv.cur</th>") %
-                QLatin1String("<th>gnd.factor</th>") %
-                QLatin1String("<th>onGnd.old</th><th>onGnd.new</th><th>onGnd.cur</th>") %
-                QLatin1String("<th>CG</th>") %
-                QLatin1String("<th>parts</th><th title=\"changed parts\">cp.</th><th>parts details</th>") %
-                QLatin1String("</tr></thead>\n");
+            static const QString tableHeader =
+                QStringLiteral("<thead><tr>") %
+                QStringLiteral("<th title=\"changed situation\">cs.</th><th>Int</th>") %
+                QStringLiteral("<th>CS</th><th>VTOL</th><th>timestamp</th><th>since</th>") %
+                QStringLiteral("<th>ts old</th><th>ts new</th><th>ts cur</th>") %
+                QStringLiteral("<th>Interpolation ts.</th><th>Sample &Delta;t</th><th>fraction</th>") %
+                QStringLiteral("<th>lat.old</th><th>lat.new</th><th>lat.cur</th>") %
+                QStringLiteral("<th>lng.old</th><th>lng.new</th><th>lng.cur</th>") %
+                QStringLiteral("<th>alt.old</th><th>alt.new</th><th>alt.cur</th>") %
+                QStringLiteral("<th>elv.old</th><th>elv.new</th><th>elv.cur</th>") %
+                QStringLiteral("<th>gnd.factor</th>") %
+                QStringLiteral("<th>onGnd.old</th><th>onGnd.new</th><th>onGnd.cur</th>") %
+                QStringLiteral("<th>CG</th>") %
+                QStringLiteral("<th>parts</th><th title=\"changed parts\">cp.</th><th>parts details</th>") %
+                QStringLiteral("</tr></thead>\n");
 
             static const CLengthUnit ft = CLengthUnit::ft();
             const SituationLog firstLog = logs.first();
-            qint64 newPosTs = firstLog.newSituation.getMSecsSinceEpoch();
+            qint64 newPosTs = firstLog.situationNew.getMSecsSinceEpoch();
             CAircraftParts lastParts; // default, so shown if parts are different from default
 
             QString tableRows("<tbody>\n");
             for (const SituationLog &log : logs)
             {
-                const bool changedNewPosition = newPosTs != log.newSituation.getMSecsSinceEpoch();
-                const bool changedParts = lastParts != log.parts;
-                newPosTs = log.newSituation.getMSecsSinceEpoch();
+                const bool changedNewPosition = newPosTs != log.situationNew.getMSecsSinceEpoch();
+                const bool changedParts = (lastParts != log.parts);
+                newPosTs = log.situationNew.getMSecsSinceEpoch();
                 lastParts = log.parts;
 
                 // concatenating in multiple steps, otherwise C4503 warnings
                 tableRows +=
-                    QLatin1String("<tr>") %
-                    (changedNewPosition ? QLatin1String("<td class=\"changed\">*</td>") : QLatin1String("<td></td>")) %
-                    QLatin1String("<td>") % log.interpolator % QLatin1String("</td>") %
-                    QLatin1String("<td>") % log.callsign.asString() % QLatin1String("</td>") %
-                    QLatin1String("<td>") % boolToYesNo(log.vtolAircraft) % QLatin1String("</td>") %
-                    QLatin1String("<td>") % msSinceEpochToTime(log.timestamp) % QLatin1String("</td>") %
-                    QLatin1String("<td>") % QString::number(log.timestamp - firstLog.timestamp) % QLatin1String("</td>") %
+                    QStringLiteral("<tr>") %
+                    (changedNewPosition ? QStringLiteral("<td class=\"changed\">*</td>") : QStringLiteral("<td></td>")) %
+                    QStringLiteral("<td>") % log.interpolator % QStringLiteral("</td>") %
+                    QStringLiteral("<td>") % log.callsign.asString() % QStringLiteral("</td>") %
+                    QStringLiteral("<td>") % boolToYesNo(log.vtolAircraft) % QStringLiteral("</td>") %
+                    QStringLiteral("<td>") % msSinceEpochToTime(log.tsCurrent) % QStringLiteral("</td>") %
+                    QStringLiteral("<td>") % QString::number(log.tsCurrent - firstLog.tsCurrent) % QStringLiteral("</td>") %
 
-                    QLatin1String("<td class=\"old\">") % msSinceEpochToTime(log.oldSituation.getAdjustedMSecsSinceEpoch()) % QLatin1Char('-') % QString::number(log.oldSituation.getTimeOffsetMs()) % QLatin1String("</td>") %
-                    QLatin1String("<td class=\"new\">") % msSinceEpochToTime(log.newSituation.getAdjustedMSecsSinceEpoch()) % QLatin1Char('-') % QString::number(log.newSituation.getTimeOffsetMs()) % QLatin1String("</td>") %
-                    QLatin1String("<td class=\"cur\">") % msSinceEpochToTime(log.currentSituation.getAdjustedMSecsSinceEpoch()) % QLatin1Char('-') % QString::number(log.currentSituation.getTimeOffsetMs()) % QLatin1String("</td>") %
+                    QStringLiteral("<td class=\"old\">") % log.situationOld.getTimestampAndOffset(true) % QStringLiteral("</td>") %
+                    QStringLiteral("<td class=\"new\">") % log.situationNew.getTimestampAndOffset(true) % QStringLiteral("</td>") %
+                    QStringLiteral("<td class=\"cur\">") % log.situationCurrent.getTimestampAndOffset(true) % QStringLiteral("</td>") %
 
-                    QLatin1String("<td>") % QString::number(log.deltaTimeMs) % QLatin1String("</td>") %
-                    QLatin1String("<td>") % QString::number(log.deltaTimeFractionMs) % QLatin1String("</td>") %
-                    QLatin1String("<td>") % QString::number(log.simulationTimeFraction) % QLatin1String("</td>");
+                    QStringLiteral("<td>") % msSinceEpochToTime(log.tsInterpolated) % QStringLiteral("</td>") %
+                    QStringLiteral("<td>") % QString::number(log.deltaSampleTimesMs) % QStringLiteral("ms</td>") %
+                    QStringLiteral("<td>") % QString::number(log.simulationTimeFraction) % QStringLiteral("</td>");
 
                 tableRows +=
-                    QLatin1String("<td class=\"old\">") % log.oldSituation.latitudeAsString() % QLatin1String("</td>") %
-                    QLatin1String("<td class=\"new\">") % log.newSituation.latitudeAsString() % QLatin1String("</td>") %
-                    QLatin1String("<td class=\"cur\">") % log.currentSituation.latitudeAsString() % QLatin1String("</td>") %
+                    QStringLiteral("<td class=\"old\">") % log.situationOld.latitudeAsString() % QStringLiteral("</td>") %
+                    QStringLiteral("<td class=\"new\">") % log.situationNew.latitudeAsString() % QStringLiteral("</td>") %
+                    QStringLiteral("<td class=\"cur\">") % log.situationCurrent.latitudeAsString() % QStringLiteral("</td>") %
 
-                    QLatin1String("<td class=\"old\">") % log.oldSituation.longitudeAsString() % QLatin1String("</td>") %
-                    QLatin1String("<td class=\"new\">") % log.newSituation.longitudeAsString() % QLatin1String("</td>") %
-                    QLatin1String("<td class=\"cur\">") % log.currentSituation.longitudeAsString() % QLatin1String("</td>");
+                    QStringLiteral("<td class=\"old\">") % log.situationOld.longitudeAsString() % QStringLiteral("</td>") %
+                    QStringLiteral("<td class=\"new\">") % log.situationNew.longitudeAsString() % QStringLiteral("</td>") %
+                    QStringLiteral("<td class=\"cur\">") % log.situationCurrent.longitudeAsString() % QStringLiteral("</td>");
 
                 tableRows +=
-                    QLatin1String("<td class=\"old\">") % log.oldSituation.getAltitude().valueRoundedWithUnit(ft, 1) % QLatin1String("</td>") %
-                    QLatin1String("<td class=\"new\">") % log.newSituation.getAltitude().valueRoundedWithUnit(ft, 1) % QLatin1String("</td>") %
-                    QLatin1String("<td class=\"cur\">") % log.currentSituation.getAltitude().valueRoundedWithUnit(ft, 1) % QLatin1String("</td>") %
+                    QStringLiteral("<td class=\"old\">") % log.situationOld.getAltitude().valueRoundedWithUnit(ft, 1) % QStringLiteral("</td>") %
+                    QStringLiteral("<td class=\"new\">") % log.situationNew.getAltitude().valueRoundedWithUnit(ft, 1) % QStringLiteral("</td>") %
+                    QStringLiteral("<td class=\"cur\">") % log.situationCurrent.getAltitude().valueRoundedWithUnit(ft, 1) % QStringLiteral("</td>") %
 
-                    QLatin1String("<td class=\"old\">") % log.oldSituation.getGroundElevation().valueRoundedWithUnit(ft, 1) % QLatin1String("</td>") %
-                    QLatin1String("<td class=\"new\">") % log.newSituation.getGroundElevation().valueRoundedWithUnit(ft, 1) % QLatin1String("</td>") %
-                    QLatin1String("<td class=\"cur\">") % log.currentSituation.getGroundElevation().valueRoundedWithUnit(ft, 1) % QLatin1String("</td>") %
+                    QStringLiteral("<td class=\"old\">") % log.situationOld.getGroundElevation().valueRoundedWithUnit(ft, 1) % QStringLiteral("</td>") %
+                    QStringLiteral("<td class=\"new\">") % log.situationNew.getGroundElevation().valueRoundedWithUnit(ft, 1) % QStringLiteral("</td>") %
+                    QStringLiteral("<td class=\"cur\">") % log.situationCurrent.getGroundElevation().valueRoundedWithUnit(ft, 1) % QStringLiteral("</td>") %
 
-                    QLatin1String("<td>") % QString::number(log.groundFactor) % QLatin1String("</td>") %
-                    QLatin1String("<td class=\"old\">") % log.oldSituation.getOnGroundInfo() % QLatin1String("</td>") %
-                    QLatin1String("<td class=\"new\">") % log.newSituation.getOnGroundInfo() % QLatin1String("</td>") %
-                    QLatin1String("<td class=\"cur\">") % log.currentSituation.getOnGroundInfo() % QLatin1String("</td>");
+                    QStringLiteral("<td>") % QString::number(log.groundFactor) % QStringLiteral("</td>") %
+                    QStringLiteral("<td class=\"old\">") % log.situationOld.getOnGroundInfo() % QStringLiteral("</td>") %
+                    QStringLiteral("<td class=\"new\">") % log.situationNew.getOnGroundInfo() % QStringLiteral("</td>") %
+                    QStringLiteral("<td class=\"cur\">") % log.situationCurrent.getOnGroundInfo() % QStringLiteral("</td>");
 
                 tableRows +=
-                    QLatin1String("<td>") % log.cgAboveGround.valueRoundedWithUnit(CLengthUnit::ft(), 0) % QLatin1String("</td>") %
-                    QLatin1String("<td>") % boolToYesNo(log.useParts) % QLatin1String("</td>") %
-                    (changedParts ? QLatin1String("<td class=\"changed\">*</td>") : QLatin1String("<td></td>")) %
-                    QLatin1String("<td>") % (log.useParts ? log.parts.toQString(true) : QLatin1String("")) % QLatin1String("</td>") %
-                    QLatin1String("</tr>\n");
+                    QStringLiteral("<td>") % log.cgAboveGround.valueRoundedWithUnit(ft, 0) % QStringLiteral("</td>") %
+                    QStringLiteral("<td>") % boolToYesNo(log.useParts) % QStringLiteral("</td>") %
+                    (changedParts ? QStringLiteral("<td class=\"changed\">*</td>") : QStringLiteral("<td></td>")) %
+                    QStringLiteral("<td>") % (log.useParts ? log.parts.toQString(true) : QStringLiteral("")) % QStringLiteral("</td>") %
+                    QStringLiteral("</tr>\n");
             }
 
-            tableRows += QLatin1String("</tbody>\n");
-            return QLatin1String("<table class=\"small\">\n") % tableHeader % tableRows % QLatin1String("</table>\n");
+            tableRows += QStringLiteral("</tbody>\n");
+            return QStringLiteral("<table class=\"small\">\n") % tableHeader % tableRows % QStringLiteral("</table>\n");
         }
 
         QString CInterpolationLogger::getHtmlPartsLog(const QList<PartsLog> &logs)
         {
             if (logs.isEmpty()) { return {}; }
-            const QString tableHeader =
-                QLatin1String("<thead><tr>") %
-                QLatin1String("<th>CS</th><th>timestamp</th>") %
-                QLatin1String("<th>c.</th>") %
-                QLatin1String("<th>parts</th>") %
-                QLatin1String("</tr></thead>\n");
+            static const QString tableHeader =
+                QStringLiteral("<thead><tr>") %
+                QStringLiteral("<th>CS</th><th>timestamp</th>") %
+                QStringLiteral("<th>c.</th>") %
+                QStringLiteral("<th>parts</th>") %
+                QStringLiteral("</tr></thead>\n");
 
             CAircraftParts lastParts; // default, so shown if parts are different from default
             QString tableRows("<tbody>\n");
             for (const PartsLog &log : logs)
             {
-                const bool changedParts = lastParts != log.parts;
+                const bool changedParts = (lastParts != log.parts);
                 lastParts = log.parts;
                 tableRows +=
-                    QLatin1String("<tr>") %
-                    QLatin1String("<td>") % log.callsign.asString() % QLatin1String("</td>") %
-                    QLatin1String("<td>") % msSinceEpochToTime(log.timestamp) % QLatin1String("</td>") %
-                    (changedParts ? QLatin1String("<td class=\"changed\">*</td>") : QLatin1String("<td></td>")) %
-                    QLatin1String("<td>") % (log.empty ? QLatin1String("empty") : log.parts.toQString()) % QLatin1String("</td>");
+                    QStringLiteral("<tr>") %
+                    QStringLiteral("<td>") % log.callsign.asString() % QStringLiteral("</td>") %
+                    QStringLiteral("<td>") % msSinceEpochToTime(log.tsCurrent) % QStringLiteral("</td>") %
+                    (changedParts ? QStringLiteral("<td class=\"changed\">*</td>") : QStringLiteral("<td></td>")) %
+                    QStringLiteral("<td>") % (log.empty ? QStringLiteral("empty") : log.parts.toQString()) % QStringLiteral("</td>");
             }
-            tableRows += QLatin1String("</tbody>\n");
-            return QLatin1String("<table class=\"small\">\n") % tableHeader % tableRows % QLatin1String("</table>\n");
+            tableRows += QStringLiteral("</tbody>\n");
+            return QStringLiteral("<table class=\"small\">\n") % tableHeader % tableRows % QStringLiteral("</table>\n");
         }
 
         void CInterpolationLogger::clearLog()
@@ -362,10 +390,86 @@ namespace BlackMisc
             return QDateTime::fromMSecsSinceEpoch(ms).toString(dateFormat);
         }
 
+        QString CInterpolationLogger::msSinceEpochToTimeAndTimestamp(qint64 ms)
+        {
+            return CInterpolationLogger::msSinceEpochToTime(ms) % QStringLiteral("/") % QString::number(ms);
+        }
+
         QString CInterpolationLogger::msSinceEpochToTime(qint64 t1, qint64 t2, qint64 t3)
         {
-            if (t3 < 0) return QString("%1 %2").arg(msSinceEpochToTime(t1), msSinceEpochToTime(t2));
-            return QString("%1 %2 %3").arg(msSinceEpochToTime(t1), msSinceEpochToTime(t2), msSinceEpochToTime(t3));
+            static const QString s2("%1 %2");
+            if (t3 < 0) { return s2.arg(msSinceEpochToTime(t1), msSinceEpochToTime(t2)); }
+
+            static const QString s3("%1 %2 %3");
+            return s3.arg(msSinceEpochToTime(t1), msSinceEpochToTime(t2), msSinceEpochToTime(t3));
+        }
+
+        QString CInterpolationLogger::SituationLog::toQString(
+            bool withCurrentSituation, bool withHints, bool withSetup,
+            bool withElevation, bool withOtherPositions, bool withDeltaTimes, const QString &separator) const
+        {
+            return QStringLiteral("CS: ") % callsign.asString() % separator %
+                   QStringLiteral("ts: ") % CInterpolationLogger::msSinceEpochToTimeAndTimestamp(tsCurrent) %
+                   QStringLiteral(" type: ") % this->interpolationType() %
+                   QStringLiteral(" gnd.fa.: ") % QString::number(groundFactor) %
+                   (
+                       withHints ?
+                       separator % QStringLiteral("hints: ") % usedHints.toQString(true) :
+                       QStringLiteral("")
+                   ) %
+                   (
+                       withSetup ?
+                       separator % QStringLiteral("setup: ") % usedSetup.toQString(true) :
+                       QStringLiteral("")
+                   ) %
+                   (
+                       withElevation ?
+                       separator %
+                       QStringLiteral("transf.elv.: ") % QString::number(noTransferredElevations)  :
+                       QStringLiteral("")
+                   ) %
+                   (
+                       withDeltaTimes ?
+                       separator %
+                       QStringLiteral("int.time: ") % CInterpolationLogger::msSinceEpochToTimeAndTimestamp(tsCurrent) %
+                       QStringLiteral(" sample dt: ") % QString::number(deltaSampleTimesMs) % QStringLiteral("ms") %
+                       QStringLiteral(" fr.[0-1]: ") % QString::number(simulationTimeFraction) %
+                       QStringLiteral(" old pos.: ") % situationOld.getTimestampAndOffset(true) %
+                       QStringLiteral(" new pos.: ") % situationNew.getTimestampAndOffset(true) :
+                       QStringLiteral("")
+                   ) %
+                   (
+                       withCurrentSituation ?
+                       separator %
+                       QStringLiteral("sit.: ") % situationCurrent.toQString(true) :
+                       QStringLiteral("")
+                   ) %
+                   (
+                       withOtherPositions ?
+                       separator %
+                       QStringLiteral("old: ") % situationOld.toQString(true) %
+                       separator %
+                       QStringLiteral("new: ") % situationNew.toQString(true) :
+                       QStringLiteral("")
+                   );
+        }
+
+        QString CInterpolationLogger::PartsLog::toQString(const QString &separator) const
+        {
+            return QStringLiteral("CS: ") % callsign.asString() % separator %
+                   QStringLiteral("ts: ") % CInterpolationLogger::msSinceEpochToTimeAndTimestamp(tsCurrent) %
+                   separator %
+                   QStringLiteral("parts: ") % parts.toQString(true);
+        }
+
+        const QString &CInterpolationLogger::SituationLog::interpolationType() const
+        {
+            static const QString s("spline");
+            static const QString l("linear");
+            static const QString u("unknown");
+            if (interpolator == 's') { return s; }
+            if (interpolator == 'l') { return l; }
+            return u;
         }
     } // namespace
 } // namespace
diff --git a/src/blackmisc/simulation/interpolationlogger.h b/src/blackmisc/simulation/interpolationlogger.h
index 83ec49da5..fd8d6c3b1 100644
--- a/src/blackmisc/simulation/interpolationlogger.h
+++ b/src/blackmisc/simulation/interpolationlogger.h
@@ -13,6 +13,7 @@
 #define BLACKMISC_SIMULATION_INTERPOLATIONLOGGER_H
 
 #include "interpolationrenderingsetup.h"
+#include "interpolationhints.h"
 #include "blackmisc/simulation/remoteaircraftprovider.h"
 #include "blackmisc/aviation/aircraftpartslist.h"
 #include "blackmisc/aviation/aircraftsituation.h"
@@ -52,31 +53,51 @@ namespace BlackMisc
             static QString getLogDirectory();
 
             //! Log entry for situation interpolation
-            struct SituationLog
+            struct BLACKMISC_EXPORT SituationLog
             {
                 QChar interpolator;          //!< what interpolator is used
-                qint64 timestamp = -1;       //!< current timestamp
+                qint64 tsCurrent = -1;       //!< current timestamp
+                qint64 tsInterpolated = -1;  //!< timestamp interpolated
                 double groundFactor = -1;    //!< current ground factor
                 double vtolAircraft = false; //!< VTOL aircraft
-                double deltaTimeMs = 0;      //!< delta time to last situation
-                double simulationTimeFraction = -1; //!< time fraction, normally 0..1
-                double deltaTimeFractionMs = -1;    //!< delta time fraction
+                double simulationTimeFraction = -1; //!< time fraction, expected 0..1
+                double deltaSampleTimesMs = -1;     //!< delta time between samples (i.e. 2 situations)
                 bool useParts = false;              //!< supporting aircraft parts
+                int noTransferredElevations = 0;    //!< transferred elevation to n situations
                 Aviation::CCallsign callsign;       //!< current callsign
                 Aviation::CAircraftParts parts;     //!< corresponding parts used in interpolator
-                Aviation::CAircraftSituation oldSituation;     //!< old situation
-                Aviation::CAircraftSituation newSituation;     //!< new situation
-                Aviation::CAircraftSituation currentSituation; //!< interpolated situation
-                PhysicalQuantities::CLength cgAboveGround;     //!< center of gravity
+                Aviation::CAircraftSituation situationOld;     //!< old situation
+                Aviation::CAircraftSituation situationNew;     //!< new situation
+                Aviation::CAircraftSituation situationCurrent; //!< interpolated situation
+                PhysicalQuantities::CLength  cgAboveGround;    //!< center of gravity
+                CInterpolationAndRenderingSetup usedSetup;     //!< used setup
+                CInterpolationHints usedHints; //!< hints
+
+                //! Delta time between interpolation and current time
+                double deltaCurrentToInterpolatedTime() const
+                {
+                    return static_cast<double>(tsCurrent - tsInterpolated);
+                }
+
+                //! Full name of interpolator
+                const QString &interpolationType() const;
+
+                //! To string
+                QString toQString(
+                    bool withCurrentSituation, bool withHints, bool withSetup, bool withElevation,
+                    bool withOtherPositions, bool withDeltaTimes, const QString &separator = {" "}) const;
             };
 
             //! Log entry for parts interpolation
-            struct PartsLog
+            struct BLACKMISC_EXPORT PartsLog
             {
-                qint64 timestamp = -1; //!< current timestamp
+                qint64 tsCurrent = -1; //!< current timestamp
                 bool empty = false;    //!< empty parts?
                 Aviation::CCallsign callsign;   //!< current callsign
                 Aviation::CAircraftParts parts; //!< parts to be logged
+
+                //! To string
+                QString toQString(const QString &separator = {" "}) const;
             };
 
             //! Log current interpolation cycle, only stores in memory, for performance reasons
@@ -108,6 +129,14 @@ namespace BlackMisc
             //! \threadsafe
             QList<PartsLog> getPartsLog(const Aviation::CCallsign &cs) const;
 
+            //! Get last log
+            //! \threadsafe
+            SituationLog getLastSituationLog() const;
+
+            //! Get last log
+            //! \threadsafe
+            SituationLog getLastSituationLog(const Aviation::CCallsign &cs) const;
+
             //! Get last situation
             //! \threadsafe
             Aviation::CAircraftSituation getLastSituation() const;
@@ -124,6 +153,14 @@ namespace BlackMisc
             //! \threadsafe
             Aviation::CAircraftParts getLastParts(const Aviation::CCallsign &cs) const;
 
+            //! Get last parts
+            //! \threadsafe
+            PartsLog getLastPartsLog() const;
+
+            //! Get last parts
+            //! \threadsafe
+            PartsLog getLastPartsLog(const Aviation::CCallsign &cs) const;
+
             //! File pattern for interpolation log
             static const QString &filePatternInterpolationLog();
 
@@ -149,12 +186,15 @@ namespace BlackMisc
             //! Create readable time
             static QString msSinceEpochToTime(qint64 ms);
 
+            //! Create readable time plus timestamp
+            static QString msSinceEpochToTimeAndTimestamp(qint64 ms);
+
             //! Create readable time
             static QString msSinceEpochToTime(qint64 t1, qint64 t2, qint64 t3 = -1);
 
-            mutable QReadWriteLock m_lockSituations; //!< lock logging
-            mutable QReadWriteLock m_lockParts;      //!< lock logging
-            int m_maxSituations = 2500;
+            mutable QReadWriteLock m_lockSituations; //!< lock logging situations
+            mutable QReadWriteLock m_lockParts;      //!< lock logging parts
+            int m_maxSituations = 2500;              //!< max.number of situations
             QList<PartsLog> m_partsLogs;             //!< logs of parts
             QList<SituationLog> m_situationLogs;     //!< logs of interpolation
         };
diff --git a/src/blackmisc/simulation/interpolationrenderingsetup.cpp b/src/blackmisc/simulation/interpolationrenderingsetup.cpp
index 2938705e2..e6abc4efc 100644
--- a/src/blackmisc/simulation/interpolationrenderingsetup.cpp
+++ b/src/blackmisc/simulation/interpolationrenderingsetup.cpp
@@ -157,7 +157,7 @@ namespace BlackMisc
             return m_callsignsToLog;
         }
 
-        bool CInterpolationAndRenderingSetup::logCallsign(const Aviation::CCallsign &callsign) const
+        bool CInterpolationAndRenderingSetup::isLogCallsign(const Aviation::CCallsign &callsign) const
         {
             return m_callsignsToLog.contains(callsign);
         }
diff --git a/src/blackmisc/simulation/interpolationrenderingsetup.h b/src/blackmisc/simulation/interpolationrenderingsetup.h
index 8c1eeb0a6..90e9d0f56 100644
--- a/src/blackmisc/simulation/interpolationrenderingsetup.h
+++ b/src/blackmisc/simulation/interpolationrenderingsetup.h
@@ -114,7 +114,7 @@ namespace BlackMisc
             BlackMisc::Aviation::CCallsignSet getLogCallsigns() const;
 
             //! Log the given callsign?
-            bool logCallsign(const Aviation::CCallsign &callsign) const;
+            bool isLogCallsign(const Aviation::CCallsign &callsign) const;
 
             //! \copydoc BlackMisc::Mixin::String::toQString
             QString convertToQString(bool i18n = false) const;
diff --git a/src/blackmisc/simulation/interpolator.cpp b/src/blackmisc/simulation/interpolator.cpp
index 2e01ad9f4..ef9bb069c 100644
--- a/src/blackmisc/simulation/interpolator.cpp
+++ b/src/blackmisc/simulation/interpolator.cpp
@@ -140,11 +140,10 @@ namespace BlackMisc
             {
                 log.timestamp = currentTimeMsSinceEpoc;
                 log.callsign = m_callsign;
-                log.cgAboveGround = hints.getCGAboveGround();
-                log.vtolAircraft = hints.isVtolAircraft();
-                log.currentSituation = currentSituation;
-                log.useParts = hints.hasAircraftParts();
-                log.parts = hints.getAircraftParts();
+                log.groundFactor = groundFactor;
+                log.situationCurrent = currentSituation;
+                log.usedHints = hints;
+                log.usedSetup = setup;
                 m_logger->logInterpolation(log);
             }