diff --git a/src/blackmisc/simulation/interpolant.h b/src/blackmisc/simulation/interpolant.h
index 255896d41..21199d658 100644
--- a/src/blackmisc/simulation/interpolant.h
+++ b/src/blackmisc/simulation/interpolant.h
@@ -14,6 +14,27 @@ namespace BlackMisc::Simulation
     class IInterpolant
     {
     public:
+        //! Default ctor
+        IInterpolant() = default;
+
+        //! Constructor
+        explicit IInterpolant(int situationsAvailable) : m_situationsAvailable(situationsAvailable) {}
+
+        //! Constructor
+        IInterpolant(qint64 interpolatedTime, int situationsAvailable) : m_interpolatedTime(interpolatedTime), m_situationsAvailable(situationsAvailable) {}
+
+        virtual ~IInterpolant() = default;
+
+        //! Perform the interpolation
+        //! \return interpolated position and altitude
+        virtual std::tuple<Geo::CCoordinateGeodetic, Aviation::CAltitude> interpolatePositionAndAltitude() const = 0;
+
+        //! Interpolate the ground information/factor
+        virtual Aviation::COnGroundInfo interpolateGroundFactor() const = 0;
+
+        //! Get the PBH interpolator
+        virtual const IInterpolatorPbh &pbh() const = 0;
+
         //! "Real time" representing the interpolated situation
         qint64 getInterpolatedTime() const { return m_interpolatedTime; }
 
@@ -33,15 +54,6 @@ namespace BlackMisc::Simulation
         void setRecalculated(bool reCalculated) { m_recalculated = reCalculated; }
 
     protected:
-        //! Default ctor
-        IInterpolant() = default;
-
-        //! Constructor
-        explicit IInterpolant(int situationsAvailable) : m_situationsAvailable(situationsAvailable) {}
-
-        //! Constructor
-        IInterpolant(qint64 interpolatedTime, int situationsAvailable) : m_interpolatedTime(interpolatedTime), m_situationsAvailable(situationsAvailable) {}
-
         qint64 m_interpolatedTime = -1; //!< "Real time "of interpolated situation
         int m_situationsAvailable = 0; //!< used situations
         bool m_valid = true; //!< valid?
diff --git a/src/blackmisc/simulation/interpolator.cpp b/src/blackmisc/simulation/interpolator.cpp
index 293641bc4..e74fc41f6 100644
--- a/src/blackmisc/simulation/interpolator.cpp
+++ b/src/blackmisc/simulation/interpolator.cpp
@@ -31,12 +31,11 @@ using namespace BlackMisc::PhysicalQuantities;
 
 namespace BlackMisc::Simulation
 {
-    template <typename Derived>
-    CInterpolator<Derived>::CInterpolator(const CCallsign &callsign,
-                                          ISimulationEnvironmentProvider *simEnvProvider,
-                                          IInterpolationSetupProvider *setupProvider,
-                                          IRemoteAircraftProvider *remoteProvider,
-                                          CInterpolationLogger *logger) : m_callsign(callsign)
+    CInterpolator::CInterpolator(const CCallsign &callsign,
+                                 ISimulationEnvironmentProvider *simEnvProvider,
+                                 IInterpolationSetupProvider *setupProvider,
+                                 IRemoteAircraftProvider *remoteProvider,
+                                 CInterpolationLogger *logger) : m_callsign(callsign)
     {
         // normally when created m_cg is still null since there is no CG in the provider yet
 
@@ -52,8 +51,7 @@ namespace BlackMisc::Simulation
         this->attachLogger(logger);
     }
 
-    template <typename Derived>
-    CLength CInterpolator<Derived>::getAndFetchModelCG(const CLength &dbCG)
+    CLength CInterpolator::getAndFetchModelCG(const CLength &dbCG)
     {
         CLength cgDb = dbCG;
         if (cgDb.isNull())
@@ -74,8 +72,7 @@ namespace BlackMisc::Simulation
         return cg;
     }
 
-    template <typename Derived>
-    CAircraftSituationList CInterpolator<Derived>::remoteAircraftSituationsAndChange(const CInterpolationAndRenderingSetupPerCallsign &setup)
+    CAircraftSituationList CInterpolator::remoteAircraftSituationsAndChange(const CInterpolationAndRenderingSetupPerCallsign &setup)
     {
         CAircraftSituationList validSituations = this->remoteAircraftSituations(m_callsign);
 
@@ -103,8 +100,7 @@ namespace BlackMisc::Simulation
         return validSituations;
     }
 
-    template <typename Derived>
-    bool CInterpolator<Derived>::presetGroundElevation(CAircraftSituation &situationToPreset, const CAircraftSituation &oldSituation, const CAircraftSituation &newSituation, const CAircraftSituationChange &change)
+    bool CInterpolator::presetGroundElevation(CAircraftSituation &situationToPreset, const CAircraftSituation &oldSituation, const CAircraftSituation &newSituation, const CAircraftSituationChange &change)
     {
         // IMPORTANT: we do not know what the situation will be (interpolated to), so we cannot transfer
         situationToPreset.resetGroundElevation();
@@ -151,15 +147,13 @@ namespace BlackMisc::Simulation
         return situationToPreset.hasGroundElevation();
     }
 
-    template <typename Derived>
-    void CInterpolator<Derived>::deferredInit()
+    void CInterpolator::deferredInit()
     {
         if (m_model.hasModelString()) { return; } // set in-between
         this->initCorrespondingModel();
     }
 
-    template <typename Derived>
-    bool CInterpolator<Derived>::verifyInterpolationSituations(const CAircraftSituation &oldest, const CAircraftSituation &newer, const CAircraftSituation &latest, const CInterpolationAndRenderingSetupPerCallsign &setup)
+    bool CInterpolator::verifyInterpolationSituations(const CAircraftSituation &oldest, const CAircraftSituation &newer, const CAircraftSituation &latest, const CInterpolationAndRenderingSetupPerCallsign &setup)
     {
         if (!CBuildConfig::isLocalDeveloperDebugBuild()) { return true; }
         CAircraftSituationList situations;
@@ -196,15 +190,13 @@ namespace BlackMisc::Simulation
         return sorted && details;
     }
 
-    template <typename Derived>
-    const QStringList &CInterpolator<Derived>::getLogCategories()
+    const QStringList &CInterpolator::getLogCategories()
     {
         static const QStringList cats { CLogCategories::interpolator() };
         return cats;
     }
 
-    template <typename Derived>
-    CInterpolationResult CInterpolator<Derived>::getInterpolation(qint64 currentTimeSinceEpoch, const CInterpolationAndRenderingSetupPerCallsign &setup, uint32_t aircraftNumber)
+    CInterpolationResult CInterpolator::getInterpolation(qint64 currentTimeSinceEpoch, const CInterpolationAndRenderingSetupPerCallsign &setup, uint32_t aircraftNumber)
     {
         CInterpolationResult result;
 
@@ -222,8 +214,7 @@ namespace BlackMisc::Simulation
         return result;
     }
 
-    template <typename Derived>
-    CAircraftSituation CInterpolator<Derived>::getInterpolatedSituation()
+    CAircraftSituation CInterpolator::getInterpolatedSituation()
     {
         Q_ASSERT_X(!m_currentInterpolationStatus.isInterpolated(), Q_FUNC_INFO, "Expect reset status");
         if (m_currentSituations.isEmpty())
@@ -235,7 +226,7 @@ namespace BlackMisc::Simulation
         // interpolant as function of derived class
         // CInterpolatorLinear::Interpolant or CInterpolatorSpline::Interpolant
         SituationLog log;
-        const auto interpolant = derived()->getInterpolant(log);
+        const IInterpolant &interpolant = getInterpolant(log);
         const bool isValidInterpolant = interpolant.isValid();
 
         CAircraftSituation currentSituation = m_lastSituation;
@@ -400,8 +391,7 @@ namespace BlackMisc::Simulation
         return currentSituation;
     }
 
-    template <typename Derived>
-    CAircraftParts CInterpolator<Derived>::getInterpolatedParts()
+    CAircraftParts CInterpolator::getInterpolatedParts()
     {
         // Parts are supposed to be in correct order, latest first
         const CAircraftPartsList validParts = this->remoteAircraftParts(m_callsign);
@@ -435,8 +425,7 @@ namespace BlackMisc::Simulation
         return currentParts;
     }
 
-    template <typename Derived>
-    CAircraftParts CInterpolator<Derived>::getInterpolatedOrGuessedParts(int aircraftNumber)
+    CAircraftParts CInterpolator::getInterpolatedOrGuessedParts(int aircraftNumber)
     {
         Q_ASSERT_X(m_partsToSituationInterpolationRatio >= 1 && m_partsToSituationInterpolationRatio < 11, Q_FUNC_INFO, "Wrong ratio");
         const bool needParts = m_unitTest || m_lastParts.isNull();
@@ -482,8 +471,7 @@ namespace BlackMisc::Simulation
         return parts;
     }
 
-    template <typename Derived>
-    const CAircraftParts &CInterpolator<Derived>::logAndReturnNullParts(const QString &info, bool log)
+    const CAircraftParts &CInterpolator::logAndReturnNullParts(const QString &info, bool log)
     {
         if (!m_lastParts.isNull())
         {
@@ -502,14 +490,12 @@ namespace BlackMisc::Simulation
         return CAircraftParts::null();
     }
 
-    template <typename Derived>
-    bool CInterpolator<Derived>::doLogging() const
+    bool CInterpolator::doLogging() const
     {
         return this->hasAttachedLogger() && m_currentSetup.logInterpolation();
     }
 
-    template <typename Derived>
-    CAircraftParts CInterpolator<Derived>::guessParts(const CAircraftSituation &situation, const CAircraftSituationChange &change, const CAircraftModel &model)
+    CAircraftParts CInterpolator::guessParts(const CAircraftSituation &situation, const CAircraftSituationChange &change, const CAircraftModel &model)
     {
         CAircraftParts parts;
         parts.setMSecsSinceEpoch(situation.getMSecsSinceEpoch());
@@ -638,8 +624,7 @@ namespace BlackMisc::Simulation
         return parts;
     }
 
-    template <typename Derived>
-    void CInterpolator<Derived>::logParts(const CAircraftParts &parts, int partsNo, bool empty) const
+    void CInterpolator::logParts(const CAircraftParts &parts, int partsNo, bool empty) const
     {
         if (!this->doLogging()) { return; }
         PartsLog logInfo;
@@ -651,8 +636,7 @@ namespace BlackMisc::Simulation
         m_logger->logParts(logInfo);
     }
 
-    template <typename Derived>
-    QString CInterpolator<Derived>::getInterpolatorInfo() const
+    QString CInterpolator::getInterpolatorInfo() const
     {
         return QStringLiteral("Callsign: ") %
                m_callsign.asString() %
@@ -664,14 +648,12 @@ namespace BlackMisc::Simulation
                boolToYesNo(m_lastSituation.isNull());
     }
 
-    template <typename Derived>
-    void CInterpolator<Derived>::resetLastInterpolation()
+    void CInterpolator::resetLastInterpolation()
     {
         m_lastSituation.setNull();
     }
 
-    template <typename Derived>
-    bool CInterpolator<Derived>::initIniterpolationStepData(qint64 currentTimeSinceEpoch, const CInterpolationAndRenderingSetupPerCallsign &setup, int aircraftNumber)
+    bool CInterpolator::initIniterpolationStepData(qint64 currentTimeSinceEpoch, const CInterpolationAndRenderingSetupPerCallsign &setup, int aircraftNumber)
     {
         Q_ASSERT_X(!m_callsign.isEmpty(), Q_FUNC_INFO, "Missing callsign");
 
@@ -723,8 +705,7 @@ namespace BlackMisc::Simulation
         return success;
     }
 
-    template <typename Derived>
-    CAircraftSituation CInterpolator<Derived>::initInterpolatedSituation(const CAircraftSituation &oldSituation, const CAircraftSituation &newSituation) const
+    CAircraftSituation CInterpolator::initInterpolatedSituation(const CAircraftSituation &oldSituation, const CAircraftSituation &newSituation) const
     {
         if (m_currentSituations.isEmpty()) { return CAircraftSituation::null(); }
 
@@ -750,8 +731,7 @@ namespace BlackMisc::Simulation
         return currentSituation;
     }
 
-    template <typename Derived>
-    void CInterpolator<Derived>::initCorrespondingModel(const CAircraftModel &model)
+    void CInterpolator::initCorrespondingModel(const CAircraftModel &model)
     {
         if (model.hasModelString())
         {
@@ -768,16 +748,8 @@ namespace BlackMisc::Simulation
         this->getAndFetchModelCG(model.getCG());
     }
 
-    template <typename Derived>
-    void CInterpolator<Derived>::markAsUnitTest()
+    void CInterpolator::markAsUnitTest()
     {
         m_unitTest = true;
     }
-
-    // see here for the reason of thess forward instantiations
-    // https://isocpp.org/wiki/faq/templates#separate-template-fn-defn-from-decl
-    //! \cond PRIVATE
-    template class CInterpolator<CInterpolatorLinear>;
-    template class CInterpolator<CInterpolatorSpline>;
-    //! \endcond
 } // namespace
diff --git a/src/blackmisc/simulation/interpolator.h b/src/blackmisc/simulation/interpolator.h
index cffa36545..a929ed75e 100644
--- a/src/blackmisc/simulation/interpolator.h
+++ b/src/blackmisc/simulation/interpolator.h
@@ -13,6 +13,8 @@
 #include "blackmisc/simulation/remoteaircraftprovider.h"
 #include "blackmisc/simulation/interpolationsetupprovider.h"
 #include "blackmisc/simulation/simulationenvironmentprovider.h"
+#include "blackmisc/simulation/interpolationlogger.h"
+#include "blackmisc/simulation/interpolant.h"
 #include "blackmisc/simulation/aircraftmodel.h"
 #include "blackmisc/aviation/aircraftsituationchange.h"
 #include "blackmisc/aviation/aircraftsituation.h"
@@ -20,6 +22,7 @@
 #include "blackmisc/aviation/callsign.h"
 #include "blackmisc/logcategories.h"
 #include "blackmisc/statusmessagelist.h"
+#include "blackmisc/blackmiscexport.h"
 
 #include <QString>
 #include <QStringList>
@@ -32,9 +35,11 @@ namespace BlackMisc::Simulation
     class CInterpolatorLinear;
     class CInterpolatorSpline;
 
-    //! Interpolator, calculation inbetween positions
-    template <typename Derived>
-    class CInterpolator :
+    //! Base class for interpolating (calculate positions inbetween updates).
+    //! One instance is responsible for one aircraft
+    //! This class provides the high level functions for interpolation (called from the simulator plugin), logging functionality, as well as the logic to interpolate aircraft parts.
+    //! Information for the position interpolation (basically aircraft updates from FSD) are provided from this class.
+    class BLACKMISC_EXPORT CInterpolator :
         protected CSimulationEnvironmentAware,
         protected CInterpolationSetupAware,
         protected CRemoteAircraftAware
@@ -174,17 +179,9 @@ namespace BlackMisc::Simulation
         //! Return NULL parts and log
         const BlackMisc::Aviation::CAircraftParts &logAndReturnNullParts(const QString &info, bool log);
 
-        //! @{
-        //! Derived class
-        Derived *derived() { return static_cast<Derived *>(this); }
-        const Derived *derived() const { return static_cast<const Derived *>(this); }
-        //! @}
+        //! Get the interpolant for the given time point
+        virtual const IInterpolant &getInterpolant(SituationLog &log) = 0;
     };
-
-    //! \cond PRIVATE
-    extern template class BLACKMISC_EXPORT_DECLARE_TEMPLATE CInterpolator<CInterpolatorLinear>;
-    extern template class BLACKMISC_EXPORT_DECLARE_TEMPLATE CInterpolator<CInterpolatorSpline>;
-    //! \endcond
 } // namespace
 // namespace
 #endif // guard
diff --git a/src/blackmisc/simulation/interpolatorlinear.cpp b/src/blackmisc/simulation/interpolatorlinear.cpp
index 083c3ed4e..874610629 100644
--- a/src/blackmisc/simulation/interpolatorlinear.cpp
+++ b/src/blackmisc/simulation/interpolatorlinear.cpp
@@ -100,7 +100,7 @@ namespace BlackMisc::Simulation
         }
     }
 
-    CInterpolatorLinear::CInterpolant CInterpolatorLinear::getInterpolant(SituationLog &log)
+    const IInterpolant &CInterpolatorLinear::getInterpolant(SituationLog &log)
     {
         // set default situations
         CAircraftSituation startSituation = m_interpolant.getStartSituation();
diff --git a/src/blackmisc/simulation/interpolatorlinear.h b/src/blackmisc/simulation/interpolatorlinear.h
index 46e22f33b..0cb6e9bce 100644
--- a/src/blackmisc/simulation/interpolatorlinear.h
+++ b/src/blackmisc/simulation/interpolatorlinear.h
@@ -25,7 +25,7 @@ namespace BlackMisc
     namespace Simulation
     {
         //! Linear interpolator, calculation inbetween positions
-        class BLACKMISC_EXPORT CInterpolatorLinear : public CInterpolator<CInterpolatorLinear>
+        class BLACKMISC_EXPORT CInterpolatorLinear : public CInterpolator
         {
             virtual void anchor() override;
 
@@ -47,12 +47,11 @@ namespace BlackMisc
                 CInterpolant(const Aviation::CAircraftSituation &startSituation, const Aviation::CAircraftSituation &endSituation, double timeFraction, qint64 interpolatedTime);
                 //! @}
 
-                //! Perform the interpolation
-                //! \return interpolated position and altitude
-                std::tuple<Geo::CCoordinateGeodetic, Aviation::CAltitude> interpolatePositionAndAltitude() const;
+                //! \copydoc BlackMisc::Simulation::IInterpolant::interpolatePositionAndAltitude
+                std::tuple<Geo::CCoordinateGeodetic, Aviation::CAltitude> interpolatePositionAndAltitude() const override;
 
-                //! Interpolate the ground information/factor
-                Aviation::COnGroundInfo interpolateGroundFactor() const;
+                //! \copydoc BlackMisc::Simulation::IInterpolant::interpolateGroundFactor
+                Aviation::COnGroundInfo interpolateGroundFactor() const override;
 
                 //! Start situation
                 const Aviation::CAircraftSituation &getStartSituation() const { return m_startSituation; }
@@ -60,7 +59,8 @@ namespace BlackMisc
                 //! End situation
                 const Aviation::CAircraftSituation &getEndSituation() const { return m_endSituation; }
 
-                const IInterpolatorPbh &pbh() const { return m_pbh; }
+                //! \copydoc BlackMisc::Simulation::IInterpolant::pbh
+                const IInterpolatorPbh &pbh() const override { return m_pbh; }
 
             private:
                 Aviation::CAircraftSituation m_startSituation;
@@ -69,8 +69,8 @@ namespace BlackMisc
                 CInterpolatorLinearPbh m_pbh;
             };
 
-            //! Get the interpolant for the given time point
-            CInterpolant getInterpolant(SituationLog &log);
+            //! \copydoc BlackMisc::Simulation::CInterpolator::getInterpolant
+            const IInterpolant &getInterpolant(SituationLog &log) override;
 
         private:
             CInterpolant m_interpolant; //!< current interpolant
diff --git a/src/blackmisc/simulation/interpolatorspline.cpp b/src/blackmisc/simulation/interpolatorspline.cpp
index 24858a7ce..717974535 100644
--- a/src/blackmisc/simulation/interpolatorspline.cpp
+++ b/src/blackmisc/simulation/interpolatorspline.cpp
@@ -175,7 +175,7 @@ namespace BlackMisc::Simulation
     void CInterpolatorSpline::anchor()
     {}
 
-    CInterpolatorSpline::CInterpolant CInterpolatorSpline::getInterpolant(SituationLog &log)
+    const IInterpolant &CInterpolatorSpline::getInterpolant(SituationLog &log)
     {
         // recalculate derivatives only if they changed
         // m_situationsLastModified updated in initIniterpolationStepData
diff --git a/src/blackmisc/simulation/interpolatorspline.h b/src/blackmisc/simulation/interpolatorspline.h
index a87842729..325c2a2ee 100644
--- a/src/blackmisc/simulation/interpolatorspline.h
+++ b/src/blackmisc/simulation/interpolatorspline.h
@@ -15,7 +15,7 @@
 namespace BlackMisc::Simulation
 {
     //! Cubic spline interpolator
-    class BLACKMISC_EXPORT CInterpolatorSpline : public CInterpolator<CInterpolatorSpline>
+    class BLACKMISC_EXPORT CInterpolatorSpline : public CInterpolator
     {
         virtual void anchor() override;
 
@@ -63,13 +63,11 @@ namespace BlackMisc::Simulation
             //! Constructor
             CInterpolant(const PosArray &pa, const PhysicalQuantities::CLengthUnit &altitudeUnit, const CInterpolatorLinearPbh &pbh);
 
-            //! Perform the interpolation
-            //! \param situation situation used as a base for interpolation. Contains for example the already interpolated PBH.
-            //! \return \p situation with interpolated position and altitude and updated timestamp
-            std::tuple<Geo::CCoordinateGeodetic, Aviation::CAltitude> interpolatePositionAndAltitude() const;
+            //! \copydoc BlackMisc::Simulation::IInterpolant::interpolatePositionAndAltitude
+            std::tuple<Geo::CCoordinateGeodetic, Aviation::CAltitude> interpolatePositionAndAltitude() const override;
 
-            //! Interpolate the ground information/factor
-            Aviation::COnGroundInfo interpolateGroundFactor() const;
+            //! \copydoc BlackMisc::Simulation::IInterpolant::interpolateGroundFactor
+            Aviation::COnGroundInfo interpolateGroundFactor() const override;
 
             //! Set the time values
             void setTimes(qint64 currentTimeMs, double timeFraction, qint64 interpolatedTimeMs);
@@ -77,7 +75,8 @@ namespace BlackMisc::Simulation
             //! \private UNIT tests/ASSERT only
             const PosArray &getPa() const { return m_pa; }
 
-            const IInterpolatorPbh &pbh() const { return m_pbh; }
+            //! \copydoc BlackMisc::Simulation::IInterpolant::pbh
+            const IInterpolatorPbh &pbh() const override { return m_pbh; }
 
         private:
             PosArray m_pa; //!< current positions array, latest values last
@@ -86,8 +85,8 @@ namespace BlackMisc::Simulation
             CInterpolatorLinearPbh m_pbh; //!< the used PBH interpolator
         };
 
-        //! Strategy used by CInterpolator::getInterpolatedSituation
-        CInterpolant getInterpolant(SituationLog &log);
+        //! \copydoc BlackMisc::Simulation::CInterpolator::getInterpolant
+        const IInterpolant &getInterpolant(SituationLog &log) override;
 
     private:
         //! Update the elevations used in CInterpolatorSpline::m_s