Index: sources/gui/qml/components/BaseChart.qml
===================================================================
diff -u -rbf64129a9adff73e4ff07d1c0946a0ec8274f1be -raf06f02c35f69afe8c8cf9e45873161075dab3ac
--- sources/gui/qml/components/BaseChart.qml	(.../BaseChart.qml)	(revision bf64129a9adff73e4ff07d1c0946a0ec8274f1be)
+++ sources/gui/qml/components/BaseChart.qml	(.../BaseChart.qml)	(revision af06f02c35f69afe8c8cf9e45873161075dab3ac)
@@ -48,6 +48,9 @@
         _line1.append( now, lineSeries1Value )
         _line2.append( now, lineSeries2Value )
         _line3.append( now, lineSeries3Value )
+
+        var pos = _chartView.mapToPosition( _line1.at( _line1.count - 1), _line1 )
+        _mouseArea.updateLinePosition( pos.x, pos.y )  // move vertical line to newest plot
     }
 
     // set window
@@ -58,6 +61,7 @@
         _xAxis.min = min
         _xAxis.max = max
 
+        plotGraph() // plot first point
         _timer.start()
     }
 
@@ -150,7 +154,6 @@
             width   : 1
             height  : _chartView.plotArea.height
             y       : _chartView.plotArea.y
-            visible : false // Hidden until touched
 
             ShapePath {
                 strokeColor : "#CA8D36"
@@ -196,12 +199,11 @@
         }
 
         // --- Touch/Mouse Handling Area ---
-        MouseArea {
+        MouseArea { id: _mouseArea
             anchors.fill: parent
             hoverEnabled: true
 
             onPressed: {
-                _verticalLine.visible = true
                 updateLinePosition(mouse.x, mouse.y)
             }
             onPositionChanged: {
@@ -242,14 +244,10 @@
                 let first = series.at(0)
                 let last = series.at(count - 1)
 
-                // if x is given before thie first point then return first y
-                if (x <= first.x)
-                    return first.y
+                // set null if y not plotted yet in graph to display as --
+                if ( x < first.x || x > last.x )
+                    return null
 
-                // if x is given after the last point then return last y
-                if (x >= last.x)
-                    return last.y
-
                 // Binary Search for a fast look ip
                 let left = 0
                 let right = count - 1