diff --git a/ground/openpilotgcs/src/plugins/uavobjectbrowser/treeitem.cpp b/ground/openpilotgcs/src/plugins/uavobjectbrowser/treeitem.cpp
index 71b9cf690..aa08a82a3 100644
--- a/ground/openpilotgcs/src/plugins/uavobjectbrowser/treeitem.cpp
+++ b/ground/openpilotgcs/src/plugins/uavobjectbrowser/treeitem.cpp
@@ -102,14 +102,16 @@ TreeItem::TreeItem(const QList<QVariant> &data, TreeItem *parent) :
     m_data(data),
     m_parent(parent),
     m_highlight(false),
-    m_changed(false)
+    m_changed(false),
+    m_known(true)
 {}
 
 TreeItem::TreeItem(const QVariant &data, TreeItem *parent) :
     QObject(0),
     m_parent(parent),
     m_highlight(false),
-    m_changed(false)
+    m_changed(false),
+    m_known(true)
 {
     m_data << data << "" << "";
 }
diff --git a/ground/openpilotgcs/src/plugins/uavobjectbrowser/treeitem.h b/ground/openpilotgcs/src/plugins/uavobjectbrowser/treeitem.h
index 9d6ab8e02..161470b02 100644
--- a/ground/openpilotgcs/src/plugins/uavobjectbrowser/treeitem.h
+++ b/ground/openpilotgcs/src/plugins/uavobjectbrowser/treeitem.h
@@ -206,6 +206,19 @@ public:
         return 0;
     }
 
+    void setKnown(bool known)
+    {
+        m_known = known;
+        foreach (TreeItem *child, m_children) {
+            child->setKnown(known);
+        }
+        updateHighlight(this);
+    }
+    inline bool isKnown()
+    {
+        return m_known;
+    }
+
 signals:
     void updateHighlight(TreeItem *);
 
@@ -222,6 +235,8 @@ private:
     QTime m_highlightExpires;
     HighLightManager *m_highlightManager;
     static int m_highlightTimeMs;
+    bool m_known;
+
 public:
     static const int dataColumn = 1;
 };
@@ -271,7 +286,8 @@ public:
         TreeItem(data, parent), m_obj(0) {}
     void setObject(UAVObject *obj)
     {
-        m_obj = obj; setDescription(obj->getDescription());
+        m_obj = obj;
+        setDescription(obj->getDescription());
     }
     inline UAVObject *object()
     {
diff --git a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowser.cpp b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowser.cpp
index 6c5342e8d..fb1b65062 100644
--- a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowser.cpp
+++ b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowser.cpp
@@ -45,6 +45,7 @@ void UAVObjectBrowser::loadConfiguration(IUAVGadgetConfiguration *config)
     UAVObjectBrowserConfiguration *m = qobject_cast<UAVObjectBrowserConfiguration *>(config);
 
     m_config = m;
+    m_widget->setUnknownObjectColor(m->unknownObjectColor());
     m_widget->setRecentlyUpdatedColor(m->recentlyUpdatedColor());
     m_widget->setManuallyChangedColor(m->manuallyChangedColor());
     m_widget->setRecentlyUpdatedTimeout(m->recentlyUpdatedTimeout());
diff --git a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowser_dependencies.pri b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowser_dependencies.pri
index 14fc925e6..2420de759 100644
--- a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowser_dependencies.pri
+++ b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowser_dependencies.pri
@@ -1,4 +1,5 @@
 include(../../plugins/uavobjects/uavobjects.pri)
 include(../../plugins/coreplugin/coreplugin.pri)
+include(../../plugins/uavtalk/uavtalk.pri)
 include(../../libs/utils/utils.pri)
 include(../../libs/qscispinbox/qscispinbox.pri)
diff --git a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserconfiguration.cpp b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserconfiguration.cpp
index f249d496a..c98f696a8 100644
--- a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserconfiguration.cpp
+++ b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserconfiguration.cpp
@@ -29,6 +29,7 @@
 
 UAVObjectBrowserConfiguration::UAVObjectBrowserConfiguration(QString classId, QSettings *qSettings, QObject *parent) :
     IUAVGadgetConfiguration(classId, parent),
+    m_unknownObjectColor(QColor(Qt::gray)),
     m_recentlyUpdatedColor(QColor(255, 230, 230)),
     m_manuallyChangedColor(QColor(230, 230, 255)),
     m_onlyHilightChangedValues(false),
@@ -44,6 +45,7 @@ UAVObjectBrowserConfiguration::UAVObjectBrowserConfiguration(QString classId, QS
         int timeout   = qSettings->value("recentlyUpdatedTimeout").toInt();
         bool hilight  = qSettings->value("onlyHilightChangedValues").toBool();
 
+        m_unknownObjectColor = qSettings->value("unknownObjectColor", QVariant(QColor(Qt::gray))).value<QColor>();
         m_useCategorizedView       = qSettings->value("CategorizedView").toBool();
         m_useScientificView        = qSettings->value("ScientificView").toBool();
         m_showMetaData = qSettings->value("showMetaData").toBool();
@@ -65,6 +67,7 @@ IUAVGadgetConfiguration *UAVObjectBrowserConfiguration::clone()
     m->m_useCategorizedView = m_useCategorizedView;
     m->m_useScientificView  = m_useScientificView;
     m->m_showMetaData = m_showMetaData;
+    m->m_unknownObjectColor = m_unknownObjectColor;
     return m;
 }
 
@@ -74,6 +77,7 @@ IUAVGadgetConfiguration *UAVObjectBrowserConfiguration::clone()
  */
 void UAVObjectBrowserConfiguration::saveConfig(QSettings *qSettings) const
 {
+    qSettings->setValue("unknownObjectColor", m_unknownObjectColor);
     qSettings->setValue("recentlyUpdatedColor", m_recentlyUpdatedColor);
     qSettings->setValue("manuallyChangedColor", m_manuallyChangedColor);
     qSettings->setValue("recentlyUpdatedTimeout", m_recentlyUpdatedTimeout);
diff --git a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserconfiguration.h b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserconfiguration.h
index ff6237e7c..14e5cb713 100644
--- a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserconfiguration.h
+++ b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserconfiguration.h
@@ -34,7 +34,9 @@
 using namespace Core;
 
 class UAVObjectBrowserConfiguration : public IUAVGadgetConfiguration {
-    Q_OBJECT Q_PROPERTY(QColor m_recentlyUpdatedColor READ recentlyUpdatedColor WRITE setRecentlyUpdatedColor)
+    Q_OBJECT
+    Q_PROPERTY(QColor m_unknownObjectColor READ unknownObjectColor WRITE setUnknownObjectColor)
+    Q_PROPERTY(QColor m_recentlyUpdatedColor READ recentlyUpdatedColor WRITE setRecentlyUpdatedColor)
     Q_PROPERTY(QColor m_manuallyChangedColor READ manuallyChangedColor WRITE setManuallyChangedColor)
     Q_PROPERTY(int m_recentlyUpdatedTimeout READ recentlyUpdatedTimeout WRITE setRecentlyUpdatedTimeout)
     Q_PROPERTY(bool m_onlyHilightChangedValues READ onlyHighlightChangedValues WRITE setOnlyHighlightChangedValues)
@@ -47,6 +49,10 @@ public:
     void saveConfig(QSettings *settings) const;
     IUAVGadgetConfiguration *clone();
 
+    QColor unknownObjectColor() const
+    {
+        return m_unknownObjectColor;
+    }
     QColor recentlyUpdatedColor() const
     {
         return m_recentlyUpdatedColor;
@@ -79,6 +85,10 @@ public:
 signals:
 
 public slots:
+    void setUnknownObjectColor(QColor color)
+    {
+        m_unknownObjectColor = color;
+    }
     void setRecentlyUpdatedColor(QColor color)
     {
         m_recentlyUpdatedColor = color;
@@ -109,6 +119,7 @@ public slots:
     }
 
 private:
+    QColor m_unknownObjectColor;
     QColor m_recentlyUpdatedColor;
     QColor m_manuallyChangedColor;
     bool m_onlyHilightChangedValues;
diff --git a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowseroptionspage.cpp b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowseroptionspage.cpp
index 90d1b2b9f..e4fad2a10 100644
--- a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowseroptionspage.cpp
+++ b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowseroptionspage.cpp
@@ -50,6 +50,7 @@ QWidget *UAVObjectBrowserOptionsPage::createPage(QWidget *parent)
 
     m_page->recentlyUpdatedButton->setColor(m_config->recentlyUpdatedColor());
     m_page->manuallyChangedButton->setColor(m_config->manuallyChangedColor());
+    m_page->unknownButton->setColor(m_config->unknownObjectColor());
     m_page->recentlyUpdatedTimeoutSpinBox->setValue(m_config->recentlyUpdatedTimeout());
     m_page->hilightBox->setChecked(m_config->onlyHighlightChangedValues());
 
@@ -58,6 +59,7 @@ QWidget *UAVObjectBrowserOptionsPage::createPage(QWidget *parent)
 
 void UAVObjectBrowserOptionsPage::apply()
 {
+    m_config->setUnknownObjectColor(m_page->unknownButton->color());
     m_config->setRecentlyUpdatedColor(m_page->recentlyUpdatedButton->color());
     m_config->setManuallyChangedColor(m_page->manuallyChangedButton->color());
     m_config->setRecentlyUpdatedTimeout(m_page->recentlyUpdatedTimeoutSpinBox->value());
diff --git a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowseroptionspage.ui b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowseroptionspage.ui
index 5ecef3160..259f746a7 100644
--- a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowseroptionspage.ui
+++ b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowseroptionspage.ui
@@ -14,7 +14,16 @@
    <string>Form</string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
-   <property name="margin">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
     <number>0</number>
    </property>
    <item>
@@ -33,12 +42,21 @@
        <rect>
         <x>0</x>
         <y>0</y>
-        <width>482</width>
-        <height>194</height>
+        <width>507</width>
+        <height>178</height>
        </rect>
       </property>
       <layout class="QGridLayout" name="gridLayout">
-       <property name="margin">
+       <property name="leftMargin">
+        <number>0</number>
+       </property>
+       <property name="topMargin">
+        <number>0</number>
+       </property>
+       <property name="rightMargin">
+        <number>0</number>
+       </property>
+       <property name="bottomMargin">
         <number>0</number>
        </property>
        <item row="0" column="0">
@@ -48,6 +66,32 @@
          </property>
         </widget>
        </item>
+       <item row="6" column="2">
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item row="1" column="2">
+        <spacer name="horizontalSpacer">
+         <property name="orientation">
+          <enum>Qt::Horizontal</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>0</width>
+           <height>20</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
        <item row="0" column="1">
         <widget class="Utils::QtColorButton" name="recentlyUpdatedButton">
          <property name="sizePolicy">
@@ -67,10 +111,33 @@
          </property>
         </widget>
        </item>
-       <item row="1" column="0">
-        <widget class="QLabel" name="label_2">
+       <item row="4" column="0">
+        <widget class="QLabel" name="label_3">
          <property name="text">
-          <string>Manually changed color:</string>
+          <string>Recently updated timeout (ms):</string>
+         </property>
+        </widget>
+       </item>
+       <item row="5" column="0">
+        <widget class="QCheckBox" name="hilightBox">
+         <property name="text">
+          <string>Only highlight nodes when value actually changes</string>
+         </property>
+        </widget>
+       </item>
+       <item row="4" column="1">
+        <widget class="QSpinBox" name="recentlyUpdatedTimeoutSpinBox">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="maximum">
+          <number>100000000</number>
+         </property>
+         <property name="singleStep">
+          <number>100</number>
          </property>
         </widget>
        </item>
@@ -93,61 +160,38 @@
          </property>
         </widget>
        </item>
-       <item row="1" column="2">
-        <spacer name="horizontalSpacer">
-         <property name="orientation">
-          <enum>Qt::Horizontal</enum>
-         </property>
-         <property name="sizeHint" stdset="0">
-          <size>
-           <width>0</width>
-           <height>20</height>
-          </size>
-         </property>
-        </spacer>
-       </item>
-       <item row="2" column="0">
-        <widget class="QLabel" name="label_3">
+       <item row="1" column="0">
+        <widget class="QLabel" name="label_2">
          <property name="text">
-          <string>Recently updated timeout (ms):</string>
-         </property>
-        </widget>
-       </item>
-       <item row="2" column="1">
-        <widget class="QSpinBox" name="recentlyUpdatedTimeoutSpinBox">
-         <property name="sizePolicy">
-          <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
-           <horstretch>0</horstretch>
-           <verstretch>0</verstretch>
-          </sizepolicy>
-         </property>
-         <property name="maximum">
-          <number>100000000</number>
-         </property>
-         <property name="singleStep">
-          <number>100</number>
+          <string>Manually changed color:</string>
          </property>
         </widget>
        </item>
        <item row="3" column="0">
-        <widget class="QCheckBox" name="hilightBox">
+        <widget class="QLabel" name="label_4">
          <property name="text">
-          <string>Only highlight nodes when value actually changes</string>
+          <string>Unknown object color:</string>
          </property>
         </widget>
        </item>
-       <item row="4" column="2">
-        <spacer name="verticalSpacer">
-         <property name="orientation">
-          <enum>Qt::Vertical</enum>
+       <item row="3" column="1">
+        <widget class="Utils::QtColorButton" name="unknownButton">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
          </property>
-         <property name="sizeHint" stdset="0">
+         <property name="minimumSize">
           <size>
-           <width>20</width>
-           <height>40</height>
+           <width>64</width>
+           <height>0</height>
           </size>
          </property>
-        </spacer>
+         <property name="text">
+          <string/>
+         </property>
+        </widget>
        </item>
       </layout>
      </widget>
@@ -162,6 +206,14 @@
    <header>utils/qtcolorbutton.h</header>
   </customwidget>
  </customwidgets>
+ <tabstops>
+  <tabstop>scrollArea</tabstop>
+  <tabstop>recentlyUpdatedButton</tabstop>
+  <tabstop>manuallyChangedButton</tabstop>
+  <tabstop>unknownButton</tabstop>
+  <tabstop>recentlyUpdatedTimeoutSpinBox</tabstop>
+  <tabstop>hilightBox</tabstop>
+ </tabstops>
  <resources/>
  <connections/>
 </ui>
diff --git a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserwidget.cpp b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserwidget.cpp
index fd900591c..9909f5def 100644
--- a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserwidget.cpp
+++ b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserwidget.cpp
@@ -50,12 +50,14 @@ UAVObjectBrowserWidget::UAVObjectBrowserWidget(QWidget *parent) : QWidget(parent
     m_model = new UAVObjectTreeModel();
     m_browser->treeView->setModel(m_model);
     m_browser->treeView->setColumnWidth(0, 300);
-    // m_browser->treeView->expandAll();
+
     BrowserItemDelegate *m_delegate = new BrowserItemDelegate();
     m_browser->treeView->setItemDelegate(m_delegate);
     m_browser->treeView->setEditTriggers(QAbstractItemView::AllEditTriggers);
     m_browser->treeView->setSelectionBehavior(QAbstractItemView::SelectItems);
+
     showMetaData(m_viewoptions->cbMetaData->isChecked());
+
     connect(m_browser->treeView->selectionModel(), SIGNAL(currentChanged(QModelIndex, QModelIndex)), this, SLOT(currentChanged(QModelIndex, QModelIndex)), Qt::UniqueConnection);
     connect(m_viewoptions->cbMetaData, SIGNAL(toggled(bool)), this, SLOT(showMetaData(bool)));
     connect(m_viewoptions->cbCategorized, SIGNAL(toggled(bool)), this, SLOT(categorize(bool)));
@@ -69,6 +71,7 @@ UAVObjectBrowserWidget::UAVObjectBrowserWidget(QWidget *parent) : QWidget(parent
     connect(m_viewoptions->cbScientific, SIGNAL(toggled(bool)), this, SLOT(viewOptionsChangedSlot()));
     connect(m_viewoptions->cbMetaData, SIGNAL(toggled(bool)), this, SLOT(viewOptionsChangedSlot()));
     connect(m_viewoptions->cbCategorized, SIGNAL(toggled(bool)), this, SLOT(viewOptionsChangedSlot()));
+
     enableSendRequest(false);
 }
 
@@ -101,6 +104,7 @@ void UAVObjectBrowserWidget::categorize(bool categorize)
     m_model->setManuallyChangedColor(m_manuallyChangedColor);
     m_model->setRecentlyUpdatedTimeout(m_recentlyUpdatedTimeout);
     m_model->setOnlyHilightChangedValues(m_onlyHilightChangedValues);
+    m_model->setUnknowObjectColor(m_unknownObjectColor);
     m_browser->treeView->setModel(m_model);
     showMetaData(m_viewoptions->cbMetaData->isChecked());
     connect(m_browser->treeView->selectionModel(), SIGNAL(currentChanged(QModelIndex, QModelIndex)), this, SLOT(currentChanged(QModelIndex, QModelIndex)), Qt::UniqueConnection);
@@ -116,6 +120,7 @@ void UAVObjectBrowserWidget::useScientificNotation(bool scientific)
     m_model->setRecentlyUpdatedColor(m_recentlyUpdatedColor);
     m_model->setManuallyChangedColor(m_manuallyChangedColor);
     m_model->setRecentlyUpdatedTimeout(m_recentlyUpdatedTimeout);
+    m_model->setUnknowObjectColor(m_unknownObjectColor);
     m_browser->treeView->setModel(m_model);
     showMetaData(m_viewoptions->cbMetaData->isChecked());
     connect(m_browser->treeView->selectionModel(), SIGNAL(currentChanged(QModelIndex, QModelIndex)), this, SLOT(currentChanged(QModelIndex, QModelIndex)), Qt::UniqueConnection);
diff --git a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserwidget.h b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserwidget.h
index dfc3bb394..b68fc0aa6 100644
--- a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserwidget.h
+++ b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjectbrowserwidget.h
@@ -44,21 +44,31 @@ class UAVObjectBrowserWidget : public QWidget {
 public:
     UAVObjectBrowserWidget(QWidget *parent = 0);
     ~UAVObjectBrowserWidget();
+
+    void setUnknownObjectColor(QColor color)
+    {
+        m_unknownObjectColor = color;
+        m_model->setUnknowObjectColor(color);
+    }
     void setRecentlyUpdatedColor(QColor color)
     {
-        m_recentlyUpdatedColor = color; m_model->setRecentlyUpdatedColor(color);
+        m_recentlyUpdatedColor = color;
+        m_model->setRecentlyUpdatedColor(color);
     }
     void setManuallyChangedColor(QColor color)
     {
-        m_manuallyChangedColor = color; m_model->setManuallyChangedColor(color);
+        m_manuallyChangedColor = color;
+        m_model->setManuallyChangedColor(color);
     }
     void setRecentlyUpdatedTimeout(int timeout)
     {
-        m_recentlyUpdatedTimeout = timeout; m_model->setRecentlyUpdatedTimeout(timeout);
+        m_recentlyUpdatedTimeout = timeout;
+        m_model->setRecentlyUpdatedTimeout(timeout);
     }
     void setOnlyHilightChangedValues(bool hilight)
     {
-        m_onlyHilightChangedValues = hilight; m_model->setOnlyHilightChangedValues(hilight);
+        m_onlyHilightChangedValues = hilight;
+        m_model->setOnlyHilightChangedValues(hilight);
     }
     void setViewOptions(bool categorized, bool scientific, bool metadata);
 public slots:
@@ -75,8 +85,10 @@ private slots:
     void currentChanged(const QModelIndex &current, const QModelIndex &previous);
     void viewSlot();
     void viewOptionsChangedSlot();
+
 signals:
     void viewOptionsChanged(bool categorized, bool scientific, bool metadata);
+
 private:
     QPushButton *m_requestUpdate;
     QPushButton *m_sendUpdate;
@@ -86,6 +98,7 @@ private:
     UAVObjectTreeModel *m_model;
 
     int m_recentlyUpdatedTimeout;
+    QColor m_unknownObjectColor;
     QColor m_recentlyUpdatedColor;
     QColor m_manuallyChangedColor;
     bool m_onlyHilightChangedValues;
diff --git a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjecttreemodel.cpp b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjecttreemodel.cpp
index ca57295a8..c402a7469 100644
--- a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjecttreemodel.cpp
+++ b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjecttreemodel.cpp
@@ -42,11 +42,13 @@ UAVObjectTreeModel::UAVObjectTreeModel(QObject *parent, bool categorize, bool us
     m_useScientificFloatNotation(useScientificNotation),
     m_categorize(categorize),
     m_recentlyUpdatedTimeout(500), // ms
+    m_unknownObjectColor(QColor(Qt::gray)),
     m_recentlyUpdatedColor(QColor(255, 230, 230)),
     m_manuallyChangedColor(QColor(230, 230, 255))
 {
     ExtensionSystem::PluginManager *pm = ExtensionSystem::PluginManager::instance();
     UAVObjectManager *objManager = pm->getObject<UAVObjectManager>();
+    Q_ASSERT(objManager);
 
     // Create highlight manager, let it run every 300 ms.
     m_highlightManager = new HighLightManager(300);
@@ -54,6 +56,12 @@ UAVObjectTreeModel::UAVObjectTreeModel(QObject *parent, bool categorize, bool us
     connect(objManager, SIGNAL(newInstance(UAVObject *)), this, SLOT(newObject(UAVObject *)));
 
     TreeItem::setHighlightTime(m_recentlyUpdatedTimeout);
+
+    TelemetryManager *telManager = pm->getObject<TelemetryManager>();
+    Q_ASSERT(telManager);
+    m_telemetryManager = telManager;
+    connect(m_telemetryManager, SIGNAL(knownObjectsChanged(UAVObject*,bool)), this, SLOT(knownObjectsChanged(UAVObject*,bool)));
+
     setupModelData(objManager);
 }
 
@@ -112,15 +120,17 @@ void UAVObjectTreeModel::addDataObject(UAVDataObject *obj)
     if (existing) {
         addInstance(obj, existing);
     } else {
-        DataObjectTreeItem *dataTreeItem = new DataObjectTreeItem(obj->getName() + " (" + QString::number(obj->getNumBytes()) + " bytes)");
+        DataObjectTreeItem *dataTreeItem = new DataObjectTreeItem(obj->getName());
         dataTreeItem->setHighlightManager(m_highlightManager);
         connect(dataTreeItem, SIGNAL(updateHighlight(TreeItem *)), this, SLOT(updateHighlight(TreeItem *)));
         parent->insertChild(dataTreeItem);
         root->addObjectTreeItem(obj->getObjID(), dataTreeItem);
         UAVMetaObject *meta = obj->getMetaObject();
         MetaObjectTreeItem *metaTreeItem = addMetaObject(meta, dataTreeItem);
+        metaTreeItem->setKnown(root == m_nonSettingsTree || m_telemetryManager->isObjectKnown(obj));
         root->addMetaObjectTreeItem(meta->getObjID(), metaTreeItem);
         addInstance(obj, dataTreeItem);
+        dataTreeItem->setKnown(root == m_nonSettingsTree || m_telemetryManager->isObjectKnown(obj));
     }
 }
 
@@ -352,20 +362,24 @@ QVariant UAVObjectTreeModel::data(const QModelIndex &index, int role) const
         return QVariant();
     }
 
+    TreeItem *item = static_cast<TreeItem *>(index.internalPointer());
+
     if (index.column() == TreeItem::dataColumn && role == Qt::EditRole) {
-        TreeItem *item = static_cast<TreeItem *>(index.internalPointer());
         return item->data(index.column());
     }
 
     if (role == Qt::ToolTipRole) {
-        TreeItem *item = static_cast<TreeItem *>(index.internalPointer());
         return item->description();
     }
 
-    TreeItem *item = static_cast<TreeItem *>(index.internalPointer());
+    if (role == Qt::ForegroundRole) {
+        if (!dynamic_cast<TopTreeItem*>(item) && !item->isKnown()) {
+            return QVariant(m_unknownObjectColor);
+        }
+    }
 
     if (index.column() == 0 && role == Qt::BackgroundRole) {
-        if (!dynamic_cast<TopTreeItem *>(item) && item->highlighted()) {
+        if(!dynamic_cast<TopTreeItem*>(item) && item->highlighted()) {
             return QVariant(m_recentlyUpdatedColor);
         }
     }
@@ -484,3 +498,18 @@ void UAVObjectTreeModel::updateHighlight(TreeItem *item)
     Q_ASSERT(itemIndex != QModelIndex());
     emit dataChanged(itemIndex, itemIndex.sibling(itemIndex.row(), TreeItem::dataColumn));
 }
+
+void UAVObjectTreeModel::knownObjectsChanged(UAVObject *object, bool known)
+{
+    if (object->isSettingsObject()) {
+        TreeItem * item;
+        if (object->isMetaDataObject()) {
+            item = m_settingsTree->findMetaObjectTreeItemByObjectId(object->getObjID());
+        } else {
+            item = m_settingsTree->findDataObjectTreeItemByObjectId(object->getObjID());
+        }
+        if (item) {
+            item->setKnown(known);
+        }
+    }
+}
diff --git a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjecttreemodel.h b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjecttreemodel.h
index be7737e1d..147bf1ce7 100644
--- a/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjecttreemodel.h
+++ b/ground/openpilotgcs/src/plugins/uavobjectbrowser/uavobjecttreemodel.h
@@ -29,6 +29,7 @@
 #define UAVOBJECTTREEMODEL_H
 
 #include "treeitem.h"
+#include "uavtalk/telemetrymanager.h"
 #include <QAbstractItemModel>
 #include <QtCore/QMap>
 #include <QtCore/QList>
@@ -62,6 +63,10 @@ public:
     int rowCount(const QModelIndex &parent = QModelIndex()) const;
     int columnCount(const QModelIndex &parent = QModelIndex()) const;
 
+    void setUnknowObjectColor(QColor color)
+    {
+        m_unknownObjectColor = color;
+    }
     void setRecentlyUpdatedColor(QColor color)
     {
         m_recentlyUpdatedColor = color;
@@ -90,6 +95,7 @@ public slots:
 private slots:
     void highlightUpdatedObject(UAVObject *obj);
     void updateHighlight(TreeItem *);
+    void knownObjectsChanged(UAVObject*object, bool known);
 
 private:
     void setupModelData(UAVObjectManager *objManager);
@@ -115,10 +121,12 @@ private:
     int m_recentlyUpdatedTimeout;
     QColor m_recentlyUpdatedColor;
     QColor m_manuallyChangedColor;
+    QColor m_unknownObjectColor;
     bool m_onlyHilightChangedValues;
 
     // Highlight manager to handle highlighting of tree items.
     HighLightManager *m_highlightManager;
+    TelemetryManager *m_telemetryManager;
 };
 
 #endif // UAVOBJECTTREEMODEL_H