diff --git a/src/blackgui/components/settingssimulatorbasicscomponent.cpp b/src/blackgui/components/settingssimulatorbasicscomponent.cpp
index 5b9b934a4..7d2c3bce8 100644
--- a/src/blackgui/components/settingssimulatorbasicscomponent.cpp
+++ b/src/blackgui/components/settingssimulatorbasicscomponent.cpp
@@ -15,6 +15,7 @@
 
 using namespace BlackMisc;
 using namespace BlackMisc::Simulation;
+using namespace BlackMisc::Simulation::FsCommon;
 using namespace BlackConfig;
 
 namespace BlackGui
@@ -35,6 +36,7 @@ namespace BlackGui
             connect(ui->pb_Save, &QPushButton::clicked, this, &CSettingsSimulatorBasicsComponent::save);
             connect(ui->pb_Reset, &QPushButton::clicked, this, &CSettingsSimulatorBasicsComponent::ps_reset);
             connect(ui->pb_CopyDefaults, &QPushButton::clicked, this, &CSettingsSimulatorBasicsComponent::ps_copyDefaults);
+            connect(ui->pb_AdjustModelDirectory, &QPushButton::clicked, this, &CSettingsSimulatorBasicsComponent::ps_adjustModelDirectory);
             connect(ui->le_SimulatorDirectory, &QLineEdit::returnPressed, this, &CSettingsSimulatorBasicsComponent::ps_simulatorDirectoryEntered);
             connect(ui->comp_SimulatorSelector, &CSimulatorSelector::changed, this, &CSettingsSimulatorBasicsComponent::ps_simulatorChanged);
 
@@ -131,6 +133,25 @@ namespace BlackGui
             this->displayExcludeDirectoryPatterns(excludes);
         }
 
+        void CSettingsSimulatorBasicsComponent::ps_adjustModelDirectory()
+        {
+            const CSimulatorInfo simulator(ui->comp_SimulatorSelector->getValue());
+            QString simDir = this->getFileBrowserSimulatorDirectory();
+            if (simulator.isFsxFamily())
+            {
+                simDir = CFsCommonUtil::fsxSimObjectsDirFromSimDir(simDir);
+            }
+            else if (simulator.fs9())
+            {
+                simDir = CFsCommonUtil::fs9AircraftDirFromSimDir(simDir);
+            }
+
+            //! \todo counterpart function for XP
+
+            const QStringList newDirs = this->addDirectory(simDir, this->parseDirectories(ui->pte_ModelDirectories->toPlainText()));
+            this->displayModelDirectories(newDirs);
+        }
+
         void CSettingsSimulatorBasicsComponent::ps_reset()
         {
             const CSimulatorInfo simulator(ui->comp_SimulatorSelector->getValue());
@@ -182,13 +203,19 @@ namespace BlackGui
 
         void CSettingsSimulatorBasicsComponent::displayExcludeDirectoryPatterns(const QStringList &dirs)
         {
-            const QString d = dirs.join("\n");
+            QStringList cleanedDirs(dirs);
+            cleanedDirs.removeDuplicates();
+            cleanedDirs.sort(this->m_fileCaseSensitivity);
+            const QString d = cleanedDirs.join("\n");
             ui->pte_ExcludeDirectories->setPlainText(d);
         }
 
         void CSettingsSimulatorBasicsComponent::displayModelDirectories(const QStringList &dirs)
         {
-            const QString d = dirs.join("\n");
+            QStringList cleanedDirs(dirs);
+            cleanedDirs.removeDuplicates();
+            cleanedDirs.sort(this->m_fileCaseSensitivity);
+            const QString d = cleanedDirs.join("\n");
             ui->pte_ModelDirectories->setPlainText(d);
         }
 
diff --git a/src/blackgui/components/settingssimulatorbasicscomponent.h b/src/blackgui/components/settingssimulatorbasicscomponent.h
index 473c26813..86964dee3 100644
--- a/src/blackgui/components/settingssimulatorbasicscomponent.h
+++ b/src/blackgui/components/settingssimulatorbasicscomponent.h
@@ -13,6 +13,7 @@
 #define BLACKGUI_COMPONENTS_SETTINGSSIMULATORBASICSCOMPONENT_H
 
 #include "blackmisc/simulation/simulatorsettings.h"
+#include "blackmisc/simulation/fscommon/fscommonutil.h"
 #include <QFrame>
 #include <QFileDialog>
 
@@ -51,6 +52,7 @@ namespace BlackGui
             void ps_simulatorFileDialog();
             void ps_simulatorDirectoryEntered();
             void ps_copyDefaults();
+            void ps_adjustModelDirectory();
             void ps_reset();
             void ps_simulatorChanged();
 
diff --git a/src/blackgui/components/settingssimulatorbasicscomponent.ui b/src/blackgui/components/settingssimulatorbasicscomponent.ui
index ac46912be..a9405b28b 100644
--- a/src/blackgui/components/settingssimulatorbasicscomponent.ui
+++ b/src/blackgui/components/settingssimulatorbasicscomponent.ui
@@ -20,7 +20,14 @@
    <enum>QFrame::Raised</enum>
   </property>
   <layout class="QGridLayout" name="gridLayout">
-   <item row="5" column="4">
+   <item row="1" column="4" alignment="Qt::AlignTop">
+    <widget class="QPushButton" name="pb_ModelFileDialog">
+     <property name="text">
+      <string>...</string>
+     </property>
+    </widget>
+   </item>
+   <item row="7" column="4">
     <widget class="QPushButton" name="pb_CopyDefaults">
      <property name="toolTip">
       <string>copy (materialize) defaults</string>
@@ -37,10 +44,10 @@
      </property>
     </widget>
    </item>
-   <item row="1" column="4" alignment="Qt::AlignTop">
-    <widget class="QPushButton" name="pb_ModelFileDialog">
+   <item row="0" column="0">
+    <widget class="QLabel" name="lbl_SimulatorDirectory">
      <property name="text">
-      <string>...</string>
+      <string>Simulator directory:</string>
      </property>
     </widget>
    </item>
@@ -51,35 +58,35 @@
      </property>
     </widget>
    </item>
-   <item row="4" column="4">
+   <item row="6" column="4">
     <widget class="QPushButton" name="pb_Reset">
      <property name="text">
       <string>reset</string>
      </property>
     </widget>
    </item>
-   <item row="0" column="0">
-    <widget class="QLabel" name="lbl_SimulatorDirectory">
-     <property name="text">
-      <string>Simulator directory:</string>
+   <item row="0" column="2">
+    <widget class="QLineEdit" name="le_SimulatorDirectory">
+     <property name="placeholderText">
+      <string>Simulator directory path</string>
      </property>
     </widget>
    </item>
-   <item row="6" column="4">
-    <widget class="QPushButton" name="pb_Save">
-     <property name="text">
-      <string>save</string>
-     </property>
-    </widget>
-   </item>
-   <item row="3" column="4" alignment="Qt::AlignTop">
+   <item row="5" column="4" alignment="Qt::AlignTop">
     <widget class="QPushButton" name="pb_ExcludeFileDialog">
      <property name="text">
       <string>...</string>
      </property>
     </widget>
    </item>
-   <item row="3" column="2" rowspan="4">
+   <item row="8" column="4">
+    <widget class="QPushButton" name="pb_Save">
+     <property name="text">
+      <string>save</string>
+     </property>
+    </widget>
+   </item>
+   <item row="5" column="2" rowspan="4">
     <widget class="QPlainTextEdit" name="pte_ExcludeDirectories">
      <property name="documentTitle">
       <string>Excluded directory patterns</string>
@@ -92,21 +99,24 @@
      </property>
     </widget>
    </item>
-   <item row="0" column="2">
-    <widget class="QLineEdit" name="le_SimulatorDirectory">
-     <property name="placeholderText">
-      <string>Simulator directory path</string>
+   <item row="5" column="0" rowspan="4" alignment="Qt::AlignTop">
+    <widget class="QLabel" name="lbl_ExcludeDirectories">
+     <property name="toolTip">
+      <string>Excluded from model loading</string>
+     </property>
+     <property name="text">
+      <string>Exclude directory patterns:</string>
      </property>
     </widget>
    </item>
-   <item row="1" column="2">
+   <item row="1" column="2" rowspan="3">
     <widget class="QPlainTextEdit" name="pte_ModelDirectories">
      <property name="placeholderText">
       <string>Model directories</string>
      </property>
     </widget>
    </item>
-   <item row="7" column="0" colspan="4" alignment="Qt::AlignRight">
+   <item row="9" column="0" colspan="4" alignment="Qt::AlignRight">
     <widget class="BlackGui::Components::CSimulatorSelector" name="comp_SimulatorSelector">
      <property name="minimumSize">
       <size>
@@ -119,13 +129,10 @@
      </property>
     </widget>
    </item>
-   <item row="3" column="0" rowspan="4" alignment="Qt::AlignTop">
-    <widget class="QLabel" name="lbl_ExcludeDirectories">
-     <property name="toolTip">
-      <string>Excluded from model loading</string>
-     </property>
+   <item row="3" column="4">
+    <widget class="QPushButton" name="pb_AdjustModelDirectory">
      <property name="text">
-      <string>Exclude directory patterns:</string>
+      <string>adjust</string>
      </property>
     </widget>
    </item>
diff --git a/src/blackmisc/simulation/fscommon/fscommonutil.cpp b/src/blackmisc/simulation/fscommon/fscommonutil.cpp
index 88a2e1635..ac5fdf723 100644
--- a/src/blackmisc/simulation/fscommon/fscommonutil.cpp
+++ b/src/blackmisc/simulation/fscommon/fscommonutil.cpp
@@ -90,7 +90,7 @@ namespace BlackMisc
             {
                 const QString fsxPath = CFsCommonUtil::fsxDirFromRegistry();
                 if (fsxPath.isEmpty()) { return ""; }
-                return QDir(fsxPath).filePath("SimObjects");
+                return CFsCommonUtil::fsxSimObjectsDirFromSimDir(fsxPath);
             }
 
             const QString &CFsCommonUtil::fsxSimObjectsDirFromRegistry()
@@ -103,7 +103,7 @@ namespace BlackMisc
             {
                 QString dir(CFsCommonUtil::fsxDir());
                 if (dir.isEmpty()) { return ""; }
-                return QDir(dir).filePath("SimObjects");
+                return CFsCommonUtil::fsxSimObjectsDirFromSimDir(dir);
             }
 
             const QString &CFsCommonUtil::fsxSimObjectsDir()
@@ -112,6 +112,12 @@ namespace BlackMisc
                 return dir;
             }
 
+            QString CFsCommonUtil::fsxSimObjectsDirFromSimDir(const QString &simDir)
+            {
+                Q_ASSERT_X(!simDir.isEmpty(), Q_FUNC_INFO, "missing simulator directory");
+                return CFileUtils::appendFilePaths(simDir, "SimObjects");
+            }
+
             const QStringList &CFsCommonUtil::fsxSimObjectsExcludeDirectoryPatterns()
             {
                 static const QStringList exclude
@@ -175,7 +181,7 @@ namespace BlackMisc
             {
                 const QString p3dPath = CFsCommonUtil::p3dDirFromRegistry();
                 if (p3dPath.isEmpty()) { return ""; }
-                return QDir(p3dPath).filePath("SimObjects");
+                return CFsCommonUtil::fsxSimObjectsDirFromSimDir(p3dPath);
             }
 
             const QString &CFsCommonUtil::p3dSimObjectsDirFromRegistry()
@@ -188,7 +194,7 @@ namespace BlackMisc
             {
                 QString dir(CFsCommonUtil::p3dDir());
                 if (dir.isEmpty()) { return ""; }
-                return QDir(dir).filePath("SimObjects");
+                return CFsCommonUtil::fsxSimObjectsDirFromSimDir(dir);
             }
 
             const QString &CFsCommonUtil::p3dSimObjectsDir()
@@ -266,21 +272,20 @@ namespace BlackMisc
             {
                 QString fs9Path = CFsCommonUtil::fs9DirFromRegistry();
                 if (fs9Path.isEmpty()) { return ""; }
-                fs9Path = QDir(fs9Path).filePath("Aircraft");
-                return fs9Path;
+                return CFsCommonUtil::fs9AircraftDirFromSimDir(fs9Path);
             }
 
             const QString &CFsCommonUtil::fs9AircraftDirFromRegistry()
             {
-                static const QString v(fs9AircraftDirFromRegistryImpl());
-                return v;
+                static const QString dir(fs9AircraftDirFromRegistryImpl());
+                return dir;
             }
 
             QString fs9AircraftDirImpl()
             {
                 const QString dir(CFsCommonUtil::fs9Dir());
                 if (dir.isEmpty()) { return ""; }
-                return QDir(dir).filePath("Aircraft");
+                return CFsCommonUtil::fs9AircraftDirFromSimDir(dir);
             }
 
             const QString &CFsCommonUtil::fs9AircraftDir()
@@ -289,6 +294,12 @@ namespace BlackMisc
                 return dir;
             }
 
+            QString CFsCommonUtil::fs9AircraftDirFromSimDir(const QString &simDir)
+            {
+                Q_ASSERT_X(!simDir.isEmpty(), Q_FUNC_INFO, "missing simulator directory");
+                return CFileUtils::appendFilePaths(simDir, "Aircraft");
+            }
+
             const QStringList &CFsCommonUtil::fs9AircraftObjectsExcludeDirectoryPatterns()
             {
                 static const QStringList exclude;
diff --git a/src/blackmisc/simulation/fscommon/fscommonutil.h b/src/blackmisc/simulation/fscommon/fscommonutil.h
index bbb57199f..f37ca2517 100644
--- a/src/blackmisc/simulation/fscommon/fscommonutil.h
+++ b/src/blackmisc/simulation/fscommon/fscommonutil.h
@@ -43,6 +43,9 @@ namespace BlackMisc
                 //! FSX's simobject dir, resolved from multiple sources
                 static const QString &fsxSimObjectsDir();
 
+                //! FSX aircraft dir, relative to simulator directory
+                static QString fsxSimObjectsDirFromSimDir(const QString &simDir);
+
                 //! Exclude directories for simObjects
                 static const QStringList &fsxSimObjectsExcludeDirectoryPatterns();
 
@@ -73,6 +76,9 @@ namespace BlackMisc
                 //! FS9's aircraft directory
                 static const QString &fs9AircraftDir();
 
+                //! FS9 aircraft dir, relative to simulator directory
+                static QString fs9AircraftDirFromSimDir(const QString &simDir);
+
                 //! Exclude directories for aircraft objects
                 static const QStringList &fs9AircraftObjectsExcludeDirectoryPatterns();
             };
diff --git a/src/blackmisc/simulation/simulatorinfo.cpp b/src/blackmisc/simulation/simulatorinfo.cpp
index 031f39491..2c665df73 100644
--- a/src/blackmisc/simulation/simulatorinfo.cpp
+++ b/src/blackmisc/simulation/simulatorinfo.cpp
@@ -111,6 +111,11 @@ namespace BlackMisc
             return isMicrosoftSimulator() || p3d();
         }
 
+        bool CSimulatorInfo::isFsxFamily() const
+        {
+            return fsx() || p3d();
+        }
+
         int CSimulatorInfo::numberSimulators() const
         {
             int c = fs9() ? 1 : 0;
diff --git a/src/blackmisc/simulation/simulatorinfo.h b/src/blackmisc/simulation/simulatorinfo.h
index 59b08d0cb..5d4e8322b 100644
--- a/src/blackmisc/simulation/simulatorinfo.h
+++ b/src/blackmisc/simulation/simulatorinfo.h
@@ -114,6 +114,9 @@ namespace BlackMisc
             //! Microsoft Simulator or P3D?
             bool isMicrosoftOrPrepare3DSimulator() const;
 
+            //! FSX family, i.e. FSX or P3D?
+            bool isFsxFamily() const;
+
             //! Number simulators selected
             int numberSimulators() const;