diff --git a/src/blackmisc/simulation/interpolatordummy.h b/src/blackmisc/simulation/interpolatordummy.h
new file mode 100644
index 000000000..ba995d60d
--- /dev/null
+++ b/src/blackmisc/simulation/interpolatordummy.h
@@ -0,0 +1,62 @@
+/* Copyright (C) 2017
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKMISC_SIMULATION_INTERPOLATORDUMMY_H
+#define BLACKMISC_SIMULATION_INTERPOLATORDUMMY_H
+
+#include "blackmisc/aviation/aircraftparts.h"
+#include "blackmisc/aviation/aircraftsituation.h"
+#include "blackmisc/aviation/callsign.h"
+#include "blackmisc/simulation/interpolationhints.h"
+#include "blackmisc/simulation/interpolationlogger.h"
+#include "blackmisc/simulation/interpolationrenderingsetup.h"
+#include "blackmisc/simulation/interpolator.h"
+
+namespace BlackMisc
+{
+    namespace Simulation
+    {
+        /*!
+         * Dummy interpolator which does nothing.
+         */
+        class BLACKMISC_EXPORT CInterpolatorDummy : public QObject
+        {
+        public:
+            //! Constructor
+            CInterpolatorDummy(const BlackMisc::Aviation::CCallsign &, QObject *parent) : QObject(parent) {}
+
+            //! \copydoc CInterpolator::getInterpolatedSituation
+            BlackMisc::Aviation::CAircraftSituation getInterpolatedSituation(
+                qint64, const CInterpolationAndRenderingSetup &, const CInterpolationHints &, CInterpolationStatus &) { return {}; }
+
+            //! \copydoc CInterpolator::getInterpolatedParts
+            BlackMisc::Aviation::CAircraftParts getInterpolatedParts(
+                qint64, const CInterpolationAndRenderingSetup &, CPartsStatus &, bool = false) { return {}; }
+
+            //! \copydoc CInterpolator::addAircraftSituation
+            void addAircraftSituation(const BlackMisc::Aviation::CAircraftSituation &) {}
+
+            //! \copydoc CInterpolator::hasAircraftSituations
+            bool hasAircraftSituations() const { return false; }
+
+            //! \copydoc CInterpolator::addAircraftParts
+            void addAircraftParts(const BlackMisc::Aviation::CAircraftParts &) {}
+
+            //! \copydoc CInterpolator::hasAircraftParts
+            bool hasAircraftParts() const { return false; }
+
+            //! \copydoc CInterpolator::attachLogger
+            void attachLogger(CInterpolationLogger *) {}
+        };
+    }
+}
+
+#endif
diff --git a/src/blackmisc/simulation/interpolatormulti.cpp b/src/blackmisc/simulation/interpolatormulti.cpp
new file mode 100644
index 000000000..9522722ef
--- /dev/null
+++ b/src/blackmisc/simulation/interpolatormulti.cpp
@@ -0,0 +1,102 @@
+/* Copyright (C) 2017
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+//! \file
+
+#include "blackmisc/simulation/interpolatormulti.h"
+
+namespace BlackMisc
+{
+    namespace Simulation
+    {
+        CInterpolatorMulti::CInterpolatorMulti(const BlackMisc::Aviation::CCallsign &callsign, QObject *parent) :
+            QObject(parent),
+            m_spline(callsign, this),
+            m_linear(callsign, this)
+        {}
+
+        BlackMisc::Aviation::CAircraftSituation CInterpolatorMulti::getInterpolatedSituation(
+            qint64 currentTimeSinceEpoc, const CInterpolationAndRenderingSetup &setup, const CInterpolationHints &hints, CInterpolationStatus &status)
+        {
+            switch (m_mode)
+            {
+            case ModeLinear:
+                return m_linear.getInterpolatedSituation(currentTimeSinceEpoc, setup, hints, status);
+            case ModeSpline:
+                return m_spline.getInterpolatedSituation(currentTimeSinceEpoc, setup, hints, status);
+            }
+            return {};
+        }
+
+        BlackMisc::Aviation::CAircraftParts CInterpolatorMulti::getInterpolatedParts(
+            qint64 cutoffTime, const CInterpolationAndRenderingSetup &setup, CPartsStatus &partsStatus, bool log)
+        {
+            switch (m_mode)
+            {
+            case ModeLinear:
+                return m_linear.getInterpolatedParts(cutoffTime, setup, partsStatus, log);
+            case ModeSpline:
+                return m_spline.getInterpolatedParts(cutoffTime, setup, partsStatus, log);
+            }
+            return {};
+        }
+
+        void CInterpolatorMulti::addAircraftSituation(const BlackMisc::Aviation::CAircraftSituation &situation)
+        {
+            m_linear.addAircraftSituation(situation);
+            m_spline.addAircraftSituation(situation);
+        }
+
+        bool CInterpolatorMulti::hasAircraftSituations() const
+        {
+            switch (m_mode)
+            {
+            case ModeLinear: return m_linear.hasAircraftSituations();
+            case ModeSpline: return m_spline.hasAircraftSituations();
+            }
+            return false;
+        }
+
+        void CInterpolatorMulti::addAircraftParts(const BlackMisc::Aviation::CAircraftParts &parts)
+        {
+            m_linear.addAircraftParts(parts);
+            m_spline.addAircraftParts(parts);
+        }
+
+        bool CInterpolatorMulti::hasAircraftParts() const
+        {
+            switch (m_mode)
+            {
+            case ModeLinear: return m_linear.hasAircraftParts();
+            case ModeSpline: return m_spline.hasAircraftParts();
+            }
+            return false;
+        }
+
+        void CInterpolatorMulti::attachLogger(CInterpolationLogger *logger)
+        {
+            m_linear.attachLogger(logger);
+            m_spline.attachLogger(logger);
+        }
+
+        bool CInterpolatorMulti::setMode(Mode mode)
+        {
+#ifdef QT_DEBUG
+            if (m_mode != mode)
+            {
+                m_mode = mode;
+                return true;
+            }
+#else
+            Q_UNUSED(mode);
+#endif
+            return false;
+        }
+    }
+}
diff --git a/src/blackmisc/simulation/interpolatormulti.h b/src/blackmisc/simulation/interpolatormulti.h
new file mode 100644
index 000000000..6e59d7d84
--- /dev/null
+++ b/src/blackmisc/simulation/interpolatormulti.h
@@ -0,0 +1,80 @@
+/* Copyright (C) 2017
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKMISC_SIMULATION_INTERPOLATORMULTI_H
+#define BLACKMISC_SIMULATION_INTERPOLATORMULTI_H
+
+#include "blackmisc/simulation/interpolatorlinear.h"
+#include "blackmisc/simulation/interpolatorspline.h"
+#include "blackmisc/simulation/interpolatordummy.h"
+
+namespace BlackMisc
+{
+    namespace Simulation
+    {
+        /*!
+         * Multiplexed interpolator which allows switching between modes at runtime.
+         */
+        class BLACKMISC_EXPORT CInterpolatorMulti : public QObject
+        {
+        public:
+            //! Constructor
+            CInterpolatorMulti(const BlackMisc::Aviation::CCallsign &callsign, QObject *parent = nullptr);
+
+            //! \copydoc CInterpolator::getInterpolatedSituation
+            BlackMisc::Aviation::CAircraftSituation getInterpolatedSituation(
+                qint64 currentTimeSinceEpoc, const CInterpolationAndRenderingSetup &setup, const CInterpolationHints &hints, CInterpolationStatus &status);
+
+            //! \copydoc CInterpolator::getInterpolatedParts
+            BlackMisc::Aviation::CAircraftParts getInterpolatedParts(
+                qint64 cutoffTime, const CInterpolationAndRenderingSetup &setup, CPartsStatus &partsStatus, bool log = false);
+
+            //! \copydoc CInterpolator::addAircraftSituation
+            void addAircraftSituation(const BlackMisc::Aviation::CAircraftSituation &situation);
+
+            //! \copydoc CInterpolator::hasAircraftSituations
+            bool hasAircraftSituations() const;
+
+            //! \copydoc CInterpolator::addAircraftParts
+            void addAircraftParts(const BlackMisc::Aviation::CAircraftParts &parts);
+
+            //! \copydoc CInterpolator::hasAircraftParts
+            bool hasAircraftParts() const;
+
+            //! \copydoc CInterpolator::attachLogger
+            void attachLogger(CInterpolationLogger *logger);
+
+            //! Supported interpolation modes.
+            enum Mode
+            {
+                ModeSpline, //!< spline interpolation mode
+                ModeLinear  //!< linear interpolation mode
+            };
+
+            //! Set interpolation mode. Return true if mode was changed. Mode will not be changed in release build.
+            bool setMode(Mode mode);
+
+            //! Get active interpolation mode.
+            Mode getMode() const { return m_mode; }
+
+        private:
+            Mode m_mode = ModeSpline;
+            CInterpolatorSpline m_spline;
+#ifdef QT_DEBUG
+            CInterpolatorLinear m_linear;
+#else
+            CInterpolatorDummy m_linear;
+#endif
+        };
+    }
+}
+
+#endif