diff --git a/Software/PC_Application/Traces/Marker/marker.cpp b/Software/PC_Application/Traces/Marker/marker.cpp
index 98587d3..7e8e970 100644
--- a/Software/PC_Application/Traces/Marker/marker.cpp
+++ b/Software/PC_Application/Traces/Marker/marker.cpp
@@ -708,9 +708,8 @@ void Marker::checkDeltaMarker()
         // not a delta marker, nothing to do
         return;
     }
-    // Check if type of delta marker is still okay
-    if(!delta || delta->getDomain() != getDomain()) {
-        // not the same domain anymore, adjust delta
+    if(!canUseAsDelta(delta)) {
+        // incompatible delta marker, select best choice instead
         assignDeltaMarker(bestDeltaCandidate());
     }
 }
@@ -973,6 +972,20 @@ Marker *Marker::bestDeltaCandidate()
     return match;
 }
 
+bool Marker::canUseAsDelta(Marker *m)
+{
+    if(type != Type::Delta) {
+        // not a delta marker, nothing to do
+        return false;
+    }
+    if(m->getDomain() != getDomain()) {
+        // not the same domain anymore, unusable
+        return false;
+    }
+
+    return true;
+}
+
 void Marker::assignDeltaMarker(Marker *m)
 {
     if(type != Type::Delta) {
@@ -1285,14 +1298,19 @@ QWidget *Marker::getTypeEditor(QAbstractItemDelegate *delegate)
         layout->setMargin(0);
         layout->setSpacing(0);
         layout->addWidget(new QLabel("to"));
-        auto spinbox = new QSpinBox;
-        if(delta) {
-            spinbox->setValue(delta->number);
+        auto deltaChooser = new QComboBox;
+        for(auto m : model->getMarkers()) {
+            if(canUseAsDelta(m)) {
+                deltaChooser->addItem(QString::number(m->getNumber()));
+            }
         }
-        connect(spinbox, qOverload<int>(&QSpinBox::valueChanged), [=](int newval){
+        if(delta) {
+            deltaChooser->setCurrentText(QString::number(delta->number));
+        }
+        connect(deltaChooser, qOverload<int>(&QComboBox::currentIndexChanged), [=](int){
            bool found = false;
            for(auto m : model->getMarkers()) {
-                if(m->number == newval) {
+                if(m->number == deltaChooser->currentText().toInt()) {
                     assignDeltaMarker(m);
                     found = true;
                     break;
@@ -1303,8 +1321,8 @@ QWidget *Marker::getTypeEditor(QAbstractItemDelegate *delegate)
            }
            update();
         });
-        spinbox->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
-        layout->addWidget(spinbox);
+        deltaChooser->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+        layout->addWidget(deltaChooser);
         w->setLayout(layout);
         c->setObjectName("Type");
         if(delegate){
@@ -1496,7 +1514,7 @@ bool Marker::isVisible()
     return visible;
 }
 
-bool Marker::setVisible(bool visible)
+void Marker::setVisible(bool visible)
 {
     if(this->visible != visible) {
         this->visible = visible;
diff --git a/Software/PC_Application/Traces/Marker/marker.h b/Software/PC_Application/Traces/Marker/marker.h
index 8c22b2f..3aab71b 100644
--- a/Software/PC_Application/Traces/Marker/marker.h
+++ b/Software/PC_Application/Traces/Marker/marker.h
@@ -98,7 +98,7 @@ public:
     SIUnitEdit* getSettingsEditor();
     void adjustSettings(double value);
     bool isVisible();
-    bool setVisible(bool visible);
+    void setVisible(bool visible);
 
     QMenu *getContextMenu();
 
@@ -107,6 +107,7 @@ public:
     Marker *getParent() const;
     const std::vector<Marker *>& getHelperMarkers() const;
     Marker *helperMarker(unsigned int i);
+    bool canUseAsDelta(Marker *m);
     void assignDeltaMarker(Marker *m);
     QString getSuffix() const;
 
diff --git a/Software/PC_Application/Traces/Marker/markerwidget.cpp b/Software/PC_Application/Traces/Marker/markerwidget.cpp
index 516eecc..da6a187 100644
--- a/Software/PC_Application/Traces/Marker/markerwidget.cpp
+++ b/Software/PC_Application/Traces/Marker/markerwidget.cpp
@@ -91,6 +91,7 @@ MarkerWidget::MarkerWidget(MarkerModel &model, QWidget *parent) :
         connect(m, &Marker::typeChanged, this, &MarkerWidget::updatePersistentEditors);
         connect(m, &Marker::traceChanged, this, &MarkerWidget::updatePersistentEditors);
         connect(m, &Marker::assignedDeltaChanged, this, &MarkerWidget::updatePersistentEditors);
+        connect(m, &Marker::deleted, this, &MarkerWidget::updatePersistentEditors);
         updatePersistentEditors();
     });
     connect(&model, &MarkerModel::setupLoadComplete, this, &MarkerWidget::updatePersistentEditors);