diff --git a/src/blackmisc/simulation/interpolatormulti.cpp b/src/blackmisc/simulation/interpolatormulti.cpp
index 9522722ef..425fc89a3 100644
--- a/src/blackmisc/simulation/interpolatormulti.cpp
+++ b/src/blackmisc/simulation/interpolatormulti.cpp
@@ -30,6 +30,8 @@ namespace BlackMisc
                 return m_linear.getInterpolatedSituation(currentTimeSinceEpoc, setup, hints, status);
             case ModeSpline:
                 return m_spline.getInterpolatedSituation(currentTimeSinceEpoc, setup, hints, status);
+            default:
+                break;
             }
             return {};
         }
@@ -43,6 +45,8 @@ namespace BlackMisc
                 return m_linear.getInterpolatedParts(cutoffTime, setup, partsStatus, log);
             case ModeSpline:
                 return m_spline.getInterpolatedParts(cutoffTime, setup, partsStatus, log);
+            default:
+                break;
             }
             return {};
         }
@@ -59,6 +63,7 @@ namespace BlackMisc
             {
             case ModeLinear: return m_linear.hasAircraftSituations();
             case ModeSpline: return m_spline.hasAircraftSituations();
+            default: break;
             }
             return false;
         }
@@ -75,6 +80,7 @@ namespace BlackMisc
             {
             case ModeLinear: return m_linear.hasAircraftParts();
             case ModeSpline: return m_spline.hasAircraftParts();
+            default: break;
             }
             return false;
         }
@@ -98,5 +104,44 @@ namespace BlackMisc
 #endif
             return false;
         }
+
+        bool CInterpolatorMulti::setMode(const QString &mode)
+        {
+            Mode m = modeFromString(mode);
+            if (m == ModeUnkown) { return false; }
+            return setMode(m);
+        }
+
+        void CInterpolatorMulti::toggleMode()
+        {
+            switch (m_mode)
+            {
+            case ModeSpline: m_mode = ModeLinear; break;
+            case ModeLinear: m_mode = ModeSpline; break;
+            default: m_mode = ModeSpline; break;
+            }
+        }
+
+        CInterpolatorMulti::Mode CInterpolatorMulti::modeFromString(const QString &mode)
+        {
+            if (mode.contains("spli"), Qt::CaseInsensitive) { return ModeSpline; }
+            if (mode.contains("lin"), Qt::CaseInsensitive) { return ModeLinear; }
+            return ModeUnkown;
+        }
+
+        const QString &CInterpolatorMulti::modeToString(CInterpolatorMulti::Mode mode)
+        {
+            static const QString l("linear");
+            static const QString s("spline");
+            static const QString u("unknown");
+
+            switch (mode)
+            {
+            case ModeLinear: return l;
+            case ModeSpline: return s;
+            case ModeUnkown:
+            default: return u;
+            }
+        }
     }
 }
diff --git a/src/blackmisc/simulation/interpolatormulti.h b/src/blackmisc/simulation/interpolatormulti.h
index 6e59d7d84..c21b40cc3 100644
--- a/src/blackmisc/simulation/interpolatormulti.h
+++ b/src/blackmisc/simulation/interpolatormulti.h
@@ -56,15 +56,28 @@ namespace BlackMisc
             enum Mode
             {
                 ModeSpline, //!< spline interpolation mode
-                ModeLinear  //!< linear interpolation mode
+                ModeLinear, //!< linear interpolation mode
+                ModeUnkown
             };
 
             //! Set interpolation mode. Return true if mode was changed. Mode will not be changed in release build.
             bool setMode(Mode mode);
 
+            //! Set interpolation mode. Return true if mode was changed. Mode will not be changed in release build.
+            bool setMode(const QString &mode);
+
             //! Get active interpolation mode.
             Mode getMode() const { return m_mode; }
 
+            //! Toogle interpolator Mode
+            void toggleMode();
+
+            //! Mode from string
+            static Mode modeFromString(const QString &mode);
+
+            //! Mode to string
+            static const QString &modeToString(Mode mode);
+
         private:
             Mode m_mode = ModeSpline;
             CInterpolatorSpline m_spline;