diff --git a/src/blackgui/components/settingssimulatorcomponent.cpp b/src/blackgui/components/settingssimulatorcomponent.cpp
index 370cc9a8e..3d205eb4c 100644
--- a/src/blackgui/components/settingssimulatorcomponent.cpp
+++ b/src/blackgui/components/settingssimulatorcomponent.cpp
@@ -40,9 +40,9 @@
 
 using namespace BlackMisc;
 using namespace BlackMisc::PhysicalQuantities;
-using namespace BlackMisc::Simulation;
 using namespace BlackMisc::Aviation;
 using namespace BlackMisc::Simulation;
+using namespace BlackMisc::Simulation::Settings;
 using namespace BlackCore;
 using namespace BlackCore::Context;
 
@@ -68,20 +68,23 @@ namespace BlackGui
             ui->le_MaxDistance->setValidator(new QIntValidator(ui->le_MaxDistance));
 
             // connects
-            connect(sGui->getIContextSimulator(), &IContextSimulator::simulatorPluginChanged, this, &CSettingsSimulatorComponent::simulatorPluginChanged);
-            connect(ui->pluginSelector_EnabledSimulators, &CPluginSelector::pluginStateChanged, this, &CSettingsSimulatorComponent::pluginStateChanged);
+            connect(sGui->getIContextSimulator(), &IContextSimulator::simulatorPluginChanged,       this, &CSettingsSimulatorComponent::simulatorPluginChanged);
+            connect(ui->pluginSelector_EnabledSimulators, &CPluginSelector::pluginStateChanged,     this, &CSettingsSimulatorComponent::pluginStateChanged);
             connect(ui->pluginSelector_EnabledSimulators, &CPluginSelector::pluginDetailsRequested, this, &CSettingsSimulatorComponent::showPluginDetails);
-            connect(ui->pluginSelector_EnabledSimulators, &CPluginSelector::pluginConfigRequested, this, &CSettingsSimulatorComponent::showPluginConfig);
-            connect(ui->pb_ApplyMaxAircraft, &QCheckBox::pressed, this, &CSettingsSimulatorComponent::onApplyMaxRenderedAircraft);
-            connect(ui->pb_ApplyTimeSync, &QCheckBox::pressed, this, &CSettingsSimulatorComponent::onApplyTimeSync);
-            connect(ui->pb_ApplyMaxDistance, &QCheckBox::pressed, this, &CSettingsSimulatorComponent::onApplyMaxRenderedDistance);
+            connect(ui->pluginSelector_EnabledSimulators, &CPluginSelector::pluginConfigRequested,  this, &CSettingsSimulatorComponent::showPluginConfig);
+
+            connect(ui->pb_ApplyMaxAircraft, &QCheckBox::pressed, this, &CSettingsSimulatorComponent::onApplyMaxRenderedAircraft, Qt::QueuedConnection);
+            connect(ui->pb_ApplyTimeSync,    &QCheckBox::pressed, this, &CSettingsSimulatorComponent::onApplyTimeSync, Qt::QueuedConnection);
+            connect(ui->pb_ApplyMaxDistance, &QCheckBox::pressed, this, &CSettingsSimulatorComponent::onApplyMaxRenderedDistance, Qt::QueuedConnection);
+            connect(ui->pb_ApplyComSync,     &QCheckBox::pressed, this, &CSettingsSimulatorComponent::onApplyComSync,             Qt::QueuedConnection);
+
             connect(ui->pb_ClearRestrictedRendering, &QCheckBox::pressed, this, &CSettingsSimulatorComponent::clearRestricedRendering);
             connect(ui->pb_DisableRendering, &QCheckBox::pressed, this, &CSettingsSimulatorComponent::onApplyDisableRendering);
             connect(ui->pb_Check, &QCheckBox::pressed, this, &CSettingsSimulatorComponent::checkSimulatorPlugins);
             connect(ui->le_MaxAircraft, &QLineEdit::editingFinished, this, &CSettingsSimulatorComponent::onApplyMaxRenderedAircraft);
             connect(ui->le_MaxDistance, &QLineEdit::editingFinished, this, &CSettingsSimulatorComponent::onApplyMaxRenderedDistance);
-            connect(ui->le_MaxAircraft, &QLineEdit::returnPressed, this, &CSettingsSimulatorComponent::onApplyMaxRenderedAircraft);
-            connect(ui->le_MaxDistance, &QLineEdit::returnPressed, this, &CSettingsSimulatorComponent::onApplyMaxRenderedDistance);
+            connect(ui->le_MaxAircraft, &QLineEdit::returnPressed,   this, &CSettingsSimulatorComponent::onApplyMaxRenderedAircraft);
+            connect(ui->le_MaxDistance, &QLineEdit::returnPressed,   this, &CSettingsSimulatorComponent::onApplyMaxRenderedDistance);
 
             // list all available simulators
             for (const auto &p : getAvailablePlugins())
@@ -91,10 +94,13 @@ namespace BlackGui
             }
 
             // config
-            reloadPluginConfig();
+            this->reloadPluginConfig();
 
             // init
-            simulatorPluginChanged(sGui->getIContextSimulator()->getSimulatorPluginInfo());
+            if (sGui && sGui->getIContextSimulator())
+            {
+                this->simulatorPluginChanged(sGui->getIContextSimulator()->getSimulatorPluginInfo());
+            }
         }
 
         CSettingsSimulatorComponent::~CSettingsSimulatorComponent()
@@ -110,6 +116,10 @@ namespace BlackGui
             ui->le_TimeSyncOffset->setEnabled(m_pluginLoaded);
             ui->pb_ApplyTimeSync->setEnabled(m_pluginLoaded);
 
+            // COM unit
+            ui->pb_ApplyComSync->setEnabled(m_pluginLoaded);
+            ui->cb_ComSync->setEnabled(m_pluginLoaded);
+
             // led
             ui->led_RestrictedRendering->setOn(m_pluginLoaded ? setup.isRenderingRestricted() : false);
             ui->lbl_RestrictionText->setText(m_pluginLoaded ? setup.getRenderRestrictionText() : "");
@@ -124,11 +134,17 @@ namespace BlackGui
 
             if (m_pluginLoaded)
             {
-                const bool timeSynced = sGui->getIContextSimulator()->isTimeSynchronized();
+                const IContextSimulator *sim = sGui->getIContextSimulator();
+                const bool timeSynced = sim->isTimeSynchronized();
                 ui->cb_TimeSync->setChecked(timeSynced);
-                const CTime timeOffset = sGui->getIContextSimulator()->getTimeSynchronizationOffset();
+                const CTime timeOffset = sim->getTimeSynchronizationOffset();
                 ui->le_TimeSyncOffset->setText(timeOffset.formattedHrsMin());
 
+                // settings
+                const CSimulatorSettings settings = sim->getSimulatorSettings();
+                ui->cb_ComSync->setChecked(settings.isComIntegrated());
+
+                // rendering
                 const int maxAircraft = setup.getMaxRenderedAircraft();
                 ui->le_MaxAircraft->setText(setup.isMaxAircraftRestricted() ? QString::number(maxAircraft) : "");
 
@@ -144,6 +160,7 @@ namespace BlackGui
 
         CSimulatorPluginInfoList CSettingsSimulatorComponent::getAvailablePlugins() const
         {
+            if (!sGui || !sGui->getIContextSimulator()) { return {}; }
             return sGui->getIContextSimulator()->getAvailableSimulatorPlugins();
         }
 
@@ -182,6 +199,8 @@ namespace BlackGui
 
         void CSettingsSimulatorComponent::onApplyMaxRenderedAircraft()
         {
+            if (!sGui || sGui->isShuttingDown() || !sGui->getIContextSimulator()) { return; }
+
             // get initial aircraft to render
             CInterpolationAndRenderingSetupGlobal setup = sGui->getIContextSimulator()->getInterpolationAndRenderingSetupGlobal();
             const int noRequested = ui->le_MaxAircraft->text().isEmpty() ? setup.InfiniteAircraft() : ui->le_MaxAircraft->text().toInt();
@@ -209,6 +228,8 @@ namespace BlackGui
 
         void CSettingsSimulatorComponent::onApplyMaxRenderedDistance()
         {
+            if (!sGui || sGui->isShuttingDown() || !sGui->getIContextSimulator()) { return; }
+
             // get initial aircraft to render
             CInterpolationAndRenderingSetupGlobal setup = sGui->getIContextSimulator()->getInterpolationAndRenderingSetupGlobal();
             CLength newDistance(0, nullptr);
@@ -218,21 +239,18 @@ namespace BlackGui
             }
 
             CLength currentDistance(setup.getMaxRenderedDistance());
-            if (currentDistance == newDistance)
-            {
-                return;
-            }
-            else
-            {
-                CLogMessage(this).info(u"Max.distance requested: %1") << newDistance.valueRoundedWithUnit(2, true);
-                setup.setMaxRenderedDistance(newDistance);
-                sGui->getIContextSimulator()->setInterpolationAndRenderingSetupGlobal(setup);
-                this->setGuiValues();
-            }
+            if (currentDistance == newDistance) { return; }
+
+            CLogMessage(this).info(u"Max.distance requested: %1") << newDistance.valueRoundedWithUnit(2, true);
+            setup.setMaxRenderedDistance(newDistance);
+            sGui->getIContextSimulator()->setInterpolationAndRenderingSetupGlobal(setup);
+            this->setGuiValues();
         }
 
         void CSettingsSimulatorComponent::onApplyDisableRendering()
         {
+            if (!sGui || sGui->isShuttingDown() || !sGui->getIContextSimulator()) { return; }
+
             CInterpolationAndRenderingSetupGlobal setup = sGui->getIContextSimulator()->getInterpolationAndRenderingSetupGlobal();
             setup.disableRendering();
             sGui->getIContextSimulator()->setInterpolationAndRenderingSetupGlobal(setup);
@@ -241,7 +259,8 @@ namespace BlackGui
 
         void CSettingsSimulatorComponent::onApplyTimeSync()
         {
-            if (!sGui || sGui->isShuttingDown()) { return; }
+            if (!sGui || sGui->isShuttingDown() || !sGui->getIContextSimulator()) { return; }
+
             const bool timeSync = ui->cb_TimeSync->isChecked();
             const QString os = ui->le_TimeSyncOffset->text();
             CTime ost(0, CTimeUnit::hrmin());
@@ -259,8 +278,23 @@ namespace BlackGui
             }
         }
 
+        void CSettingsSimulatorComponent::onApplyComSync()
+        {
+            if (!sGui || sGui->isShuttingDown() || !sGui->getIContextSimulator()) { return; }
+
+            IContextSimulator *sim = sGui->getIContextSimulator();
+            const CSimulatorInfo simulator = sim->getSimulatorPluginInfo().getSimulatorInfo();
+            if (!simulator.isSingleSimulator()) { return; }
+            CSimulatorSettings settings = sim->getSimulatorSettings();
+            if (settings.isComIntegrated() == ui->cb_ComSync->isChecked()) { return; }
+            settings.setComIntegrated(ui->cb_ComSync->isChecked());
+            sim->setSimulatorSettings(settings, simulator);
+        }
+
         void CSettingsSimulatorComponent::clearRestricedRendering()
         {
+            if (!sGui || sGui->isShuttingDown() || !sGui->getIContextSimulator()) { return; }
+
             CInterpolationAndRenderingSetupGlobal setup;
             setup.clearAllRenderingRestrictions();
             sGui->getIContextSimulator()->setInterpolationAndRenderingSetupGlobal(setup);
diff --git a/src/blackgui/components/settingssimulatorcomponent.h b/src/blackgui/components/settingssimulatorcomponent.h
index 71cdfba8f..f00b9124a 100644
--- a/src/blackgui/components/settingssimulatorcomponent.h
+++ b/src/blackgui/components/settingssimulatorcomponent.h
@@ -38,7 +38,7 @@ namespace BlackGui
             explicit CSettingsSimulatorComponent(QWidget *parent = nullptr);
 
             //! Destructor
-            virtual ~CSettingsSimulatorComponent();
+            virtual ~CSettingsSimulatorComponent() override;
 
         private:
             //! Driver plugin enabled/disabled
@@ -56,6 +56,9 @@ namespace BlackGui
             //! Apply time synchronization
             void onApplyTimeSync();
 
+            //! Apply COM sync
+            void onApplyComSync();
+
             //! Clear restricted rendering
             void clearRestricedRendering();
 
@@ -82,7 +85,7 @@ namespace BlackGui
 
             QScopedPointer<Ui::CSettingsSimulatorComponent> ui; //!< UI
             bool m_pluginLoaded = false; //!< plugin loaded?
-            BlackCore::CPluginManagerSimulator* m_plugins = nullptr;
+            BlackCore::CPluginManagerSimulator *m_plugins = nullptr;
             BlackMisc::CSetting<BlackCore::Application::TEnabledSimulators> m_enabledSimulators { this, &CSettingsSimulatorComponent::reloadPluginConfig };
         };
     }
diff --git a/src/blackgui/components/settingssimulatorcomponent.ui b/src/blackgui/components/settingssimulatorcomponent.ui
index 843bdd5cd..f5898a989 100644
--- a/src/blackgui/components/settingssimulatorcomponent.ui
+++ b/src/blackgui/components/settingssimulatorcomponent.ui
@@ -5,7 +5,7 @@
   <property name="windowTitle">
    <string>Frame</string>
   </property>
-  <layout class="QGridLayout" name="gl_SettingsSimulator" columnstretch="0,3,1">
+  <layout class="QGridLayout" name="gl_SettingsSimulator" columnstretch="0,3,1" columnminimumwidth="0,0,60">
    <property name="leftMargin">
     <number>2</number>
    </property>
@@ -18,34 +18,83 @@
    <property name="bottomMargin">
     <number>2</number>
    </property>
-   <item row="5" column="2">
-    <widget class="QPushButton" name="pb_ApplyTimeSync">
-     <property name="sizePolicy">
-      <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
-       <horstretch>0</horstretch>
-       <verstretch>0</verstretch>
-      </sizepolicy>
+   <item row="8" column="1">
+    <layout class="QHBoxLayout" name="hl_RestrictedRendering">
+     <property name="spacing">
+      <number>4</number>
      </property>
+     <item>
+      <widget class="BlackGui::CLedWidget" name="led_RestrictedRendering" native="true"/>
+     </item>
+     <item alignment="Qt::AlignLeft">
+      <widget class="QLabel" name="lbl_RestrictionText">
+       <property name="text">
+        <string>restriction info</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item row="9" column="1">
+    <layout class="QHBoxLayout" name="hl_MaxAircraft">
+     <property name="spacing">
+      <number>4</number>
+     </property>
+     <item>
+      <widget class="QLineEdit" name="le_MaxAircraft">
+       <property name="placeholderText">
+        <string>no restrictions</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item row="8" column="0">
+    <widget class="QLabel" name="lbl_RestrictedRendering">
+     <property name="toolTip">
+      <string>Current rendering restrictions (if any)</string>
+     </property>
+     <property name="text">
+      <string>Restrictions</string>
+     </property>
+    </widget>
+   </item>
+   <item row="7" column="1">
+    <widget class="BlackGui::CLedWidget" name="led_RenderingEnabled" native="true">
      <property name="minimumSize">
       <size>
-       <width>60</width>
+       <width>10</width>
        <height>0</height>
       </size>
      </property>
-     <property name="maximumSize">
-      <size>
-       <width>60</width>
-       <height>16777215</height>
-      </size>
+    </widget>
+   </item>
+   <item row="4" column="1" colspan="2">
+    <widget class="QLabel" name="lbl_PluginInfo">
+     <property name="text">
+      <string>Simulator info will go here</string>
+     </property>
+     <property name="wordWrap">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item row="5" column="0">
+    <widget class="QLabel" name="lbl_TimeSync">
+     <property name="toolTip">
+      <string>Time synchronization</string>
      </property>
      <property name="text">
-      <string>apply</string>
+      <string>Time synch.</string>
      </property>
     </widget>
    </item>
    <item row="5" column="1">
     <widget class="QWidget" name="wi_TimeSync" native="true">
      <layout class="QHBoxLayout" name="horizontalLayout">
+      <property name="spacing">
+       <number>3</number>
+      </property>
       <property name="leftMargin">
        <number>0</number>
       </property>
@@ -70,12 +119,6 @@
       </item>
       <item>
        <widget class="QLineEdit" name="le_TimeSyncOffset">
-        <property name="sizePolicy">
-         <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
-          <horstretch>0</horstretch>
-          <verstretch>0</verstretch>
-         </sizepolicy>
-        </property>
         <property name="maximumSize">
          <size>
           <width>75</width>
@@ -96,89 +139,30 @@
         </property>
        </widget>
       </item>
+      <item>
+       <spacer name="horizontalSpacer">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
      </layout>
     </widget>
    </item>
-   <item row="6" column="1">
-    <widget class="BlackGui::CLedWidget" name="led_RenderingEnabled" native="true">
-     <property name="minimumSize">
-      <size>
-       <width>10</width>
-       <height>0</height>
-      </size>
-     </property>
-    </widget>
-   </item>
-   <item row="8" column="2">
+   <item row="9" column="2">
     <widget class="QPushButton" name="pb_ApplyMaxAircraft">
-     <property name="sizePolicy">
-      <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
-       <horstretch>0</horstretch>
-       <verstretch>0</verstretch>
-      </sizepolicy>
-     </property>
-     <property name="minimumSize">
-      <size>
-       <width>60</width>
-       <height>0</height>
-      </size>
-     </property>
-     <property name="maximumSize">
-      <size>
-       <width>60</width>
-       <height>16777215</height>
-      </size>
-     </property>
      <property name="text">
       <string>apply</string>
      </property>
     </widget>
    </item>
    <item row="7" column="0">
-    <widget class="QLabel" name="lbl_RestrictedRendering">
-     <property name="toolTip">
-      <string>Current rendering restrictions (if any)</string>
-     </property>
-     <property name="text">
-      <string>Restrictions</string>
-     </property>
-    </widget>
-   </item>
-   <item row="5" column="0">
-    <widget class="QLabel" name="lbl_TimeSync">
-     <property name="toolTip">
-      <string>Time synchronization</string>
-     </property>
-     <property name="text">
-      <string>Time synch.</string>
-     </property>
-    </widget>
-   </item>
-   <item row="7" column="1">
-    <layout class="QHBoxLayout" name="hl_RestrictedRendering">
-     <property name="spacing">
-      <number>4</number>
-     </property>
-     <item>
-      <widget class="BlackGui::CLedWidget" name="led_RestrictedRendering" native="true"/>
-     </item>
-     <item alignment="Qt::AlignRight">
-      <widget class="QLabel" name="lbl_RestrictionText">
-       <property name="text">
-        <string>restriction info</string>
-       </property>
-      </widget>
-     </item>
-    </layout>
-   </item>
-   <item row="4" column="0">
-    <widget class="QLabel" name="lbl_LoadedPlugin">
-     <property name="text">
-      <string>Loaded</string>
-     </property>
-    </widget>
-   </item>
-   <item row="6" column="0">
     <widget class="QLabel" name="lbl_RenderingEnabled">
      <property name="toolTip">
       <string>Rendering enabled</string>
@@ -188,28 +172,28 @@
      </property>
     </widget>
    </item>
-   <item row="9" column="0">
+   <item row="10" column="2">
+    <widget class="QPushButton" name="pb_ApplyMaxDistance">
+     <property name="text">
+      <string>apply</string>
+     </property>
+    </widget>
+   </item>
+   <item row="10" column="0">
     <widget class="QLabel" name="lbl_MaxDistance">
      <property name="text">
       <string>Max.dist.(NM)</string>
      </property>
     </widget>
    </item>
-   <item row="8" column="1">
-    <layout class="QHBoxLayout" name="hl_MaxAircraft">
-     <property name="spacing">
-      <number>4</number>
+   <item row="8" column="2">
+    <widget class="QPushButton" name="pb_ClearRestrictedRendering">
+     <property name="text">
+      <string>clear</string>
      </property>
-     <item>
-      <widget class="QLineEdit" name="le_MaxAircraft">
-       <property name="placeholderText">
-        <string>no restrictions</string>
-       </property>
-      </widget>
-     </item>
-    </layout>
+    </widget>
    </item>
-   <item row="9" column="1">
+   <item row="10" column="1">
     <layout class="QHBoxLayout" name="hl_MaxDistance">
      <property name="spacing">
       <number>4</number>
@@ -223,63 +207,13 @@
      </item>
     </layout>
    </item>
-   <item row="8" column="0">
-    <widget class="QLabel" name="lbl_MaxAircraft">
-     <property name="text">
-      <string>Max.aircraft</string>
-     </property>
-    </widget>
-   </item>
-   <item row="9" column="2">
-    <widget class="QPushButton" name="pb_ApplyMaxDistance">
-     <property name="sizePolicy">
-      <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
-       <horstretch>0</horstretch>
-       <verstretch>0</verstretch>
-      </sizepolicy>
-     </property>
-     <property name="minimumSize">
-      <size>
-       <width>60</width>
-       <height>0</height>
-      </size>
-     </property>
-     <property name="maximumSize">
-      <size>
-       <width>60</width>
-       <height>16777215</height>
-      </size>
-     </property>
+   <item row="5" column="2">
+    <widget class="QPushButton" name="pb_ApplyTimeSync">
      <property name="text">
       <string>apply</string>
      </property>
     </widget>
    </item>
-   <item row="7" column="2">
-    <widget class="QPushButton" name="pb_ClearRestrictedRendering">
-     <property name="sizePolicy">
-      <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
-       <horstretch>0</horstretch>
-       <verstretch>0</verstretch>
-      </sizepolicy>
-     </property>
-     <property name="minimumSize">
-      <size>
-       <width>60</width>
-       <height>0</height>
-      </size>
-     </property>
-     <property name="maximumSize">
-      <size>
-       <width>60</width>
-       <height>16777215</height>
-      </size>
-     </property>
-     <property name="text">
-      <string>clear</string>
-     </property>
-    </widget>
-   </item>
    <item row="0" column="0" colspan="3">
     <widget class="BlackGui::CPluginSelector" name="pluginSelector_EnabledSimulators" native="true">
      <property name="minimumSize">
@@ -290,28 +224,10 @@
      </property>
     </widget>
    </item>
-   <item row="6" column="2">
-    <widget class="QPushButton" name="pb_DisableRendering">
-     <property name="sizePolicy">
-      <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
-       <horstretch>0</horstretch>
-       <verstretch>0</verstretch>
-      </sizepolicy>
-     </property>
-     <property name="minimumSize">
-      <size>
-       <width>60</width>
-       <height>0</height>
-      </size>
-     </property>
-     <property name="maximumSize">
-      <size>
-       <width>60</width>
-       <height>16777215</height>
-      </size>
-     </property>
+   <item row="6" column="1">
+    <widget class="QCheckBox" name="cb_ComSync">
      <property name="text">
-      <string>disable</string>
+      <string>use COM sync.</string>
      </property>
     </widget>
    </item>
@@ -331,20 +247,54 @@
      </property>
     </spacer>
    </item>
-   <item row="2" column="1" colspan="2" alignment="Qt::AlignRight">
-    <widget class="QPushButton" name="pb_Check">
+   <item row="4" column="0">
+    <widget class="QLabel" name="lbl_LoadedPlugin">
      <property name="text">
-      <string>check again </string>
+      <string>Loaded</string>
      </property>
     </widget>
    </item>
-   <item row="4" column="1" colspan="2">
-    <widget class="QLabel" name="lbl_PluginInfo">
+   <item row="9" column="0">
+    <widget class="QLabel" name="lbl_MaxAircraft">
      <property name="text">
-      <string>Simulator info will go here</string>
+      <string>Max.aircraft</string>
      </property>
-     <property name="wordWrap">
-      <bool>true</bool>
+    </widget>
+   </item>
+   <item row="7" column="2">
+    <widget class="QPushButton" name="pb_DisableRendering">
+     <property name="text">
+      <string>disable</string>
+     </property>
+    </widget>
+   </item>
+   <item row="6" column="2">
+    <widget class="QPushButton" name="pb_ApplyComSync">
+     <property name="text">
+      <string>apply</string>
+     </property>
+    </widget>
+   </item>
+   <item row="6" column="0">
+    <widget class="QLabel" name="lb_ComSync">
+     <property name="toolTip">
+      <string>Synchronize COM unit with simulator</string>
+     </property>
+     <property name="text">
+      <string>COM synch.</string>
+     </property>
+    </widget>
+   </item>
+   <item row="2" column="0" colspan="3" alignment="Qt::AlignRight">
+    <widget class="QPushButton" name="pb_Check">
+     <property name="minimumSize">
+      <size>
+       <width>100</width>
+       <height>0</height>
+      </size>
+     </property>
+     <property name="text">
+      <string>check again </string>
      </property>
     </widget>
    </item>
@@ -369,6 +319,8 @@
   <tabstop>cb_TimeSync</tabstop>
   <tabstop>le_TimeSyncOffset</tabstop>
   <tabstop>pb_ApplyTimeSync</tabstop>
+  <tabstop>cb_ComSync</tabstop>
+  <tabstop>pb_ApplyComSync</tabstop>
   <tabstop>pb_DisableRendering</tabstop>
   <tabstop>pb_ClearRestrictedRendering</tabstop>
   <tabstop>le_MaxAircraft</tabstop>