diff --git a/src/gui/controls/plot.h b/src/gui/controls/plot.h
index f9b49335..2052ede1 100644
--- a/src/gui/controls/plot.h
+++ b/src/gui/controls/plot.h
@@ -116,7 +116,7 @@ class PlotPanel : public wxPanel
         virtual void    OnMouseLeftDown(wxMouseEvent& event);
         void            OnMouseLeftUp(wxMouseEvent& event);
         virtual void    OnMouseRightDown(wxMouseEvent& event);
-        void            OnMouseWheelMoved(wxMouseEvent& event);
+        virtual void    OnMouseWheelMoved(wxMouseEvent& event);
         void            OnClose(wxCloseEvent& event ){ event.Skip(); }
         virtual void    OnSize( wxSizeEvent& event ) = 0;
         void            OnErase(wxEraseEvent& event);
diff --git a/src/gui/controls/plot_spectrum.cpp b/src/gui/controls/plot_spectrum.cpp
index 7bc88a65..c0c541f6 100644
--- a/src/gui/controls/plot_spectrum.cpp
+++ b/src/gui/controls/plot_spectrum.cpp
@@ -22,8 +22,10 @@
 #include <wx/wx.h>
 
 #include "plot_spectrum.h"
+#include "codec2_fdmdv.h" // for FDMDV_FCENTRE
 
 void clickTune(float frequency); // callback to pass new click freq
+extern float           g_RxFreqOffsetHz;
 
 BEGIN_EVENT_TABLE(PlotSpectrum, PlotPanel)
     EVT_MOTION          (PlotSpectrum::OnMouseMove)
@@ -328,3 +330,27 @@ void PlotSpectrum::OnMouseRightDoubleClick(wxMouseEvent& event)
 {
     OnDoubleClickCommon(event);
 }
+
+//-------------------------------------------------------------------------
+// OnMouseWheelMoved()
+//-------------------------------------------------------------------------
+void PlotSpectrum::OnMouseWheelMoved(wxMouseEvent& event)
+{
+    float currRxFreq = FDMDV_FCENTRE - g_RxFreqOffsetHz;
+    float direction = 1.0;
+    if (event.GetWheelRotation() < 0)
+    {
+        direction = -1.0;
+    }
+    
+    currRxFreq += direction * (event.GetLinesPerAction() * 10);
+    if (currRxFreq < MIN_F_HZ)
+    {
+        currRxFreq = MIN_F_HZ;
+    }
+    else if (currRxFreq > MAX_F_HZ)
+    {
+        currRxFreq = MAX_F_HZ;
+    }
+    clickTune(currRxFreq);
+}
\ No newline at end of file
diff --git a/src/gui/controls/plot_spectrum.h b/src/gui/controls/plot_spectrum.h
index f227b2ed..86fe362b 100644
--- a/src/gui/controls/plot_spectrum.h
+++ b/src/gui/controls/plot_spectrum.h
@@ -47,6 +47,7 @@ class PlotSpectrum : public PlotPanel
         void        draw(wxGraphicsContext* ctx);
         void        OnMouseLeftDoubleClick(wxMouseEvent& event);
         void        OnMouseRightDoubleClick(wxMouseEvent& event);
+        void        OnMouseWheelMoved(wxMouseEvent& event);
 
    private:
         float       m_rxFreq;
diff --git a/src/gui/controls/plot_waterfall.cpp b/src/gui/controls/plot_waterfall.cpp
index 4fc769c9..201b0a47 100644
--- a/src/gui/controls/plot_waterfall.cpp
+++ b/src/gui/controls/plot_waterfall.cpp
@@ -25,11 +25,13 @@
 #include "os/os_interface.h"
 
 #include "plot_waterfall.h"
+#include "codec2_fdmdv.h" // for FDMDV_FCENTRE
 
 // Tweak accordingly
 #define Y_PER_SECOND (30) 
 
 extern float g_avmag[];                 // av mag spec passed in to draw() 
+extern float           g_RxFreqOffsetHz;
 void clickTune(float frequency); // callback to pass new click freq
 
 BEGIN_EVENT_TABLE(PlotWaterfall, PlotPanel)
@@ -459,6 +461,30 @@ void PlotWaterfall::OnDoubleClickCommon(wxMouseEvent& event)
     }
 }
 
+//-------------------------------------------------------------------------
+// OnMouseWheelMoved()
+//-------------------------------------------------------------------------
+void PlotWaterfall::OnMouseWheelMoved(wxMouseEvent& event)
+{
+    float currRxFreq = FDMDV_FCENTRE - g_RxFreqOffsetHz;
+    float direction = 1.0;
+    if (event.GetWheelRotation() < 0)
+    {
+        direction = -1.0;
+    }
+    
+    currRxFreq += direction * (event.GetLinesPerAction() * 10);
+    if (currRxFreq < MIN_F_HZ)
+    {
+        currRxFreq = MIN_F_HZ;
+    }
+    else if (currRxFreq > MAX_F_HZ)
+    {
+        currRxFreq = MAX_F_HZ;
+    }
+    clickTune(currRxFreq);
+}
+
 //-------------------------------------------------------------------------
 // OnMouseLeftDown()
 //-------------------------------------------------------------------------
diff --git a/src/gui/controls/plot_waterfall.h b/src/gui/controls/plot_waterfall.h
index 0d1fef52..8c40d86b 100644
--- a/src/gui/controls/plot_waterfall.h
+++ b/src/gui/controls/plot_waterfall.h
@@ -59,6 +59,7 @@ class PlotWaterfall : public PlotPanel
         void        plotPixelData();
         void        OnMouseLeftDoubleClick(wxMouseEvent& event);
         void        OnMouseRightDoubleClick(wxMouseEvent& event);
+        void        OnMouseWheelMoved(wxMouseEvent& event);
 
     private:
         float       m_dT;