diff --git a/scwx-qt/scwx-qt.cmake b/scwx-qt/scwx-qt.cmake
index 90b9b56f..74864ab7 100644
--- a/scwx-qt/scwx-qt.cmake
+++ b/scwx-qt/scwx-qt.cmake
@@ -258,6 +258,7 @@ set(HDR_UI source/scwx/qt/ui/about_dialog.hpp
            source/scwx/qt/ui/api_key_edit_widget.hpp
            source/scwx/qt/ui/collapsible_group.hpp
            source/scwx/qt/ui/county_dialog.hpp
+           source/scwx/qt/ui/custom_layer_dialog.hpp
            source/scwx/qt/ui/download_dialog.hpp
            source/scwx/qt/ui/edit_line_dialog.hpp
            source/scwx/qt/ui/edit_marker_dialog.hpp
@@ -290,6 +291,7 @@ set(SRC_UI source/scwx/qt/ui/about_dialog.cpp
            source/scwx/qt/ui/api_key_edit_widget.cpp
            source/scwx/qt/ui/collapsible_group.cpp
            source/scwx/qt/ui/county_dialog.cpp
+           source/scwx/qt/ui/custom_layer_dialog.cpp
            source/scwx/qt/ui/download_dialog.cpp
            source/scwx/qt/ui/edit_line_dialog.cpp
            source/scwx/qt/ui/edit_marker_dialog.cpp
@@ -321,6 +323,7 @@ set(UI_UI  source/scwx/qt/ui/about_dialog.ui
            source/scwx/qt/ui/animation_dock_widget.ui
            source/scwx/qt/ui/collapsible_group.ui
            source/scwx/qt/ui/county_dialog.ui
+           source/scwx/qt/ui/custom_layer_dialog.ui
            source/scwx/qt/ui/edit_line_dialog.ui
            source/scwx/qt/ui/edit_marker_dialog.ui
            source/scwx/qt/ui/gps_info_dialog.ui
diff --git a/scwx-qt/source/scwx/qt/main/main_window.cpp b/scwx-qt/source/scwx/qt/main/main_window.cpp
index ad504cc0..5b25a91a 100644
--- a/scwx-qt/source/scwx/qt/main/main_window.cpp
+++ b/scwx-qt/source/scwx/qt/main/main_window.cpp
@@ -316,7 +316,7 @@ MainWindow::MainWindow(QWidget* parent) :
    p->layerDialog_ = new ui::LayerDialog(this);
 
    // Settings Dialog
-   p->settingsDialog_ = new ui::SettingsDialog(this);
+   p->settingsDialog_ = new ui::SettingsDialog(p->settings_, this);
 
    // Map Settings
    p->mapSettingsGroup_ = new ui::CollapsibleGroup(tr("Map Settings"), this);
diff --git a/scwx-qt/source/scwx/qt/settings/general_settings.cpp b/scwx-qt/source/scwx/qt/settings/general_settings.cpp
index c6e93c76..a445da6d 100644
--- a/scwx-qt/source/scwx/qt/settings/general_settings.cpp
+++ b/scwx-qt/source/scwx/qt/settings/general_settings.cpp
@@ -107,6 +107,10 @@ public:
          SCWX_SETTINGS_ENUM_VALIDATOR(scwx::util::ClockFormat,
                                       scwx::util::ClockFormatIterator(),
                                       scwx::util::GetClockFormatName));
+
+      customStyleUrl_.SetValidator(
+         [](const std::string& value)
+         { return value.find("key=") == std::string::npos; });
       customStyleDrawLayer_.SetValidator([](const std::string& value)
                                          { return !value.empty(); });
       defaultAlertAction_.SetValidator(
diff --git a/scwx-qt/source/scwx/qt/settings/settings_interface.cpp b/scwx-qt/source/scwx/qt/settings/settings_interface.cpp
index ab36ebd9..b2089d08 100644
--- a/scwx-qt/source/scwx/qt/settings/settings_interface.cpp
+++ b/scwx-qt/source/scwx/qt/settings/settings_interface.cpp
@@ -12,6 +12,7 @@
 #include <QLineEdit>
 #include <QSpinBox>
 #include <QWidget>
+#include <utility>
 #include <vector>
 
 namespace scwx::qt::settings
@@ -19,6 +20,9 @@ namespace scwx::qt::settings
 
 static const std::string logPrefix_ = "scwx::qt::settings::settings_interface";
 
+static const QString kValidStyleSheet_   = "";
+static const QString kInvalidStyleSheet_ = "border: 2px solid red;";
+
 template<class T>
 class SettingsInterface<T>::Impl
 {
@@ -59,6 +63,8 @@ public:
    bool                       unitEnabled_ {false};
 
    bool trimmingEnabled_ {false};
+
+   std::optional<std::string> invalidTooltip_;
 };
 
 template<class T>
@@ -167,20 +173,24 @@ void SettingsInterface<T>::SetEditWidget(QWidget* widget)
    {
       if constexpr (std::is_same_v<T, std::string>)
       {
-         QObject::connect(hotkeyEdit,
-                          &ui::HotkeyEdit::KeySequenceChanged,
-                          p->context_.get(),
-                          [this](const QKeySequence& sequence)
-                          {
-                             std::string value {
-                                sequence.toString().toStdString()};
+         QObject::connect(
+            hotkeyEdit,
+            &ui::HotkeyEdit::KeySequenceChanged,
+            p->context_.get(),
+            [this, hotkeyEdit](const QKeySequence& sequence)
+            {
+               const std::string value {sequence.toString().toStdString()};
 
-                             // Attempt to stage the value
-                             p->stagedValid_ = p->variable_->StageValue(value);
-                             p->UpdateResetButton();
+               // Attempt to stage the value
+               p->stagedValid_ = p->variable_->StageValue(value);
+               p->UpdateResetButton();
 
-                             // TODO: Display invalid status
-                          });
+               hotkeyEdit->setStyleSheet(p->stagedValid_ ? kValidStyleSheet_ :
+                                                           kInvalidStyleSheet_);
+               hotkeyEdit->setToolTip(p->invalidTooltip_ && !p->stagedValid_ ?
+                                         p->invalidTooltip_->c_str() :
+                                         "");
+            });
       }
    }
    else if (QLineEdit* lineEdit = dynamic_cast<QLineEdit*>(widget))
@@ -189,53 +199,64 @@ void SettingsInterface<T>::SetEditWidget(QWidget* widget)
       {
          // If the line is edited (not programatically changed), stage the new
          // value
-         QObject::connect(lineEdit,
-                          &QLineEdit::textEdited,
-                          p->context_.get(),
-                          [this](const QString& text)
-                          {
-                             QString trimmedText =
-                                p->trimmingEnabled_ ? text.trimmed() : text;
+         QObject::connect(
+            lineEdit,
+            &QLineEdit::textEdited,
+            p->context_.get(),
+            [this, lineEdit](const QString& text)
+            {
+               const QString trimmedText =
+                  p->trimmingEnabled_ ? text.trimmed() : text;
 
-                             // Map to value if required
-                             std::string value {trimmedText.toStdString()};
-                             if (p->mapToValue_ != nullptr)
-                             {
-                                value = p->mapToValue_(value);
-                             }
+               // Map to value if required
+               std::string value {trimmedText.toStdString()};
+               if (p->mapToValue_ != nullptr)
+               {
+                  value = p->mapToValue_(value);
+               }
 
-                             // Attempt to stage the value
-                             p->stagedValid_ = p->variable_->StageValue(value);
-                             p->UpdateResetButton();
+               // Attempt to stage the value
+               p->stagedValid_ = p->variable_->StageValue(value);
+               p->UpdateResetButton();
 
-                             // TODO: Display invalid status
-                          });
+               lineEdit->setStyleSheet(p->stagedValid_ ? kValidStyleSheet_ :
+                                                         kInvalidStyleSheet_);
+               lineEdit->setToolTip(p->invalidTooltip_ && !p->stagedValid_ ?
+                                       p->invalidTooltip_->c_str() :
+                                       "");
+            });
       }
       else if constexpr (std::is_same_v<T, double>)
       {
          // If the line is edited (not programatically changed), stage the new
          // value
-         QObject::connect(lineEdit,
-                          &QLineEdit::textEdited,
-                          p->context_.get(),
-                          [this](const QString& text)
-                          {
-                             // Convert to a double
-                             bool   ok;
-                             double value = text.toDouble(&ok);
-                             if (ok)
-                             {
-                                // Attempt to stage the value
-                                p->stagedValid_ =
-                                   p->variable_->StageValue(value);
-                                p->UpdateResetButton();
-                             }
-                             else
-                             {
-                                p->stagedValid_ = false;
-                                p->UpdateResetButton();
-                             }
-                          });
+         QObject::connect(
+            lineEdit,
+            &QLineEdit::textEdited,
+            p->context_.get(),
+            [this, lineEdit](const QString& text)
+            {
+               // Convert to a double
+               bool         ok    = false;
+               const double value = text.toDouble(&ok);
+               if (ok)
+               {
+                  // Attempt to stage the value
+                  p->stagedValid_ = p->variable_->StageValue(value);
+                  p->UpdateResetButton();
+               }
+               else
+               {
+                  p->stagedValid_ = false;
+                  p->UpdateResetButton();
+               }
+
+               lineEdit->setStyleSheet(p->stagedValid_ ? kValidStyleSheet_ :
+                                                         kInvalidStyleSheet_);
+               lineEdit->setToolTip(p->invalidTooltip_ && !p->stagedValid_ ?
+                                       p->invalidTooltip_->c_str() :
+                                       "");
+            });
       }
       else if constexpr (std::is_same_v<T, std::vector<std::int64_t>>)
       {
@@ -245,7 +266,7 @@ void SettingsInterface<T>::SetEditWidget(QWidget* widget)
             lineEdit,
             &QLineEdit::textEdited,
             p->context_.get(),
-            [this](const QString& text)
+            [this, lineEdit](const QString& text)
             {
                // Map to value if required
                T value {};
@@ -280,7 +301,11 @@ void SettingsInterface<T>::SetEditWidget(QWidget* widget)
                p->stagedValid_ = p->variable_->StageValue(value);
                p->UpdateResetButton();
 
-               // TODO: Display invalid status
+               lineEdit->setStyleSheet(p->stagedValid_ ? kValidStyleSheet_ :
+                                                         kInvalidStyleSheet_);
+               lineEdit->setToolTip(p->invalidTooltip_ && !p->stagedValid_ ?
+                                       p->invalidTooltip_->c_str() :
+                                       "");
             });
       }
    }
@@ -343,7 +368,7 @@ void SettingsInterface<T>::SetEditWidget(QWidget* widget)
             spinBox,
             &QSpinBox::valueChanged,
             p->context_.get(),
-            [this](int i)
+            [this, spinBox](int i)
             {
                const T                value  = p->variable_->GetValue();
                const std::optional<T> staged = p->variable_->GetStaged();
@@ -364,6 +389,12 @@ void SettingsInterface<T>::SetEditWidget(QWidget* widget)
                   p->UpdateResetButton();
                }
                // Otherwise, don't process an unchanged value
+
+               spinBox->setStyleSheet(p->stagedValid_ ? kValidStyleSheet_ :
+                                                        kInvalidStyleSheet_);
+               spinBox->setToolTip(p->invalidTooltip_ && !p->stagedValid_ ?
+                                      p->invalidTooltip_->c_str() :
+                                      "");
             });
       }
    }
@@ -389,7 +420,7 @@ void SettingsInterface<T>::SetEditWidget(QWidget* widget)
             doubleSpinBox,
             &QDoubleSpinBox::valueChanged,
             p->context_.get(),
-            [this](double d)
+            [this, doubleSpinBox](double d)
             {
                if (p->unitEnabled_)
                {
@@ -415,6 +446,13 @@ void SettingsInterface<T>::SetEditWidget(QWidget* widget)
                   p->UpdateResetButton();
                }
                // Otherwise, don't process an unchanged value
+
+               doubleSpinBox->setStyleSheet(
+                  p->stagedValid_ ? kValidStyleSheet_ : kInvalidStyleSheet_);
+               doubleSpinBox->setToolTip(p->invalidTooltip_ &&
+                                               !p->stagedValid_ ?
+                                            p->invalidTooltip_->c_str() :
+                                            "");
             });
       }
    }
@@ -500,6 +538,12 @@ void SettingsInterface<T>::EnableTrimming(bool trimmingEnabled)
    p->trimmingEnabled_ = trimmingEnabled;
 }
 
+template<class T>
+void SettingsInterface<T>::SetInvalidTooltip(std::optional<std::string> tooltip)
+{
+   p->invalidTooltip_ = std::move(tooltip);
+}
+
 template<class T>
 template<class U>
 void SettingsInterface<T>::Impl::SetWidgetText(U* widget, const T& currentValue)
diff --git a/scwx-qt/source/scwx/qt/settings/settings_interface.hpp b/scwx-qt/source/scwx/qt/settings/settings_interface.hpp
index 3d7d9d85..0e42aca7 100644
--- a/scwx-qt/source/scwx/qt/settings/settings_interface.hpp
+++ b/scwx-qt/source/scwx/qt/settings/settings_interface.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <optional>
 #include <scwx/qt/settings/settings_interface_base.hpp>
 
 #include <functional>
@@ -130,6 +131,13 @@ public:
     */
    void EnableTrimming(bool trimmingEnabled = true);
 
+   /**
+    * Set a tooltip to be displayed when an invalid input is given.
+    *
+    * @param tooltip the tooltip to be displayed
+    */
+   void SetInvalidTooltip(std::optional<std::string> tooltip);
+
 private:
    class Impl;
    std::unique_ptr<Impl> p;
diff --git a/scwx-qt/source/scwx/qt/ui/custom_layer_dialog.cpp b/scwx-qt/source/scwx/qt/ui/custom_layer_dialog.cpp
new file mode 100644
index 00000000..0bea7ffc
--- /dev/null
+++ b/scwx-qt/source/scwx/qt/ui/custom_layer_dialog.cpp
@@ -0,0 +1,124 @@
+#include "custom_layer_dialog.hpp"
+#include "ui_custom_layer_dialog.h"
+
+#include <re2/re2.h>
+#include <scwx/qt/settings/general_settings.hpp>
+#include <scwx/util/logger.hpp>
+#include <scwx/qt/map/map_provider.hpp>
+#include <utility>
+
+namespace scwx::qt::ui
+{
+
+static const std::string logPrefix_ = "scwx::qt::ui::custom_layer_dialog";
+static const auto        logger_    = scwx::util::Logger::Create(logPrefix_);
+
+class CustomLayerDialogImpl
+{
+public:
+   explicit CustomLayerDialogImpl(CustomLayerDialog*  self,
+                                  QMapLibre::Settings settings) :
+       self_(self), settings_(std::move(settings))
+   {
+   }
+
+   ~CustomLayerDialogImpl()                                       = default;
+   CustomLayerDialogImpl(const CustomLayerDialogImpl&)            = delete;
+   CustomLayerDialogImpl(CustomLayerDialogImpl&&)                 = delete;
+   CustomLayerDialogImpl& operator=(const CustomLayerDialogImpl&) = delete;
+   CustomLayerDialogImpl& operator=(CustomLayerDialogImpl&&)      = delete;
+
+   void handle_mapChanged(QMapLibre::Map::MapChange change);
+
+   CustomLayerDialog* self_;
+
+   QMapLibre::Settings             settings_;
+   std::shared_ptr<QMapLibre::Map> map_;
+};
+
+// TODO Duplicated form map_widget, Should probably be moved.
+static bool match_layer(const std::string& pattern, const std::string& layer)
+{
+   // Perform case-insensitive matching
+   const RE2 re {"(?i)" + pattern};
+   if (re.ok())
+   {
+      return RE2::FullMatch(layer, re);
+   }
+   else
+   {
+      // Fall back to basic comparison if RE
+      // doesn't compile
+      return layer == pattern;
+   }
+}
+
+void CustomLayerDialogImpl::handle_mapChanged(QMapLibre::Map::MapChange change)
+{
+   if (change == QMapLibre::Map::MapChange::MapChangeDidFinishLoadingStyle)
+   {
+      auto& generalSettings = settings::GeneralSettings::Instance();
+      const std::string& customStyleDrawLayer =
+         generalSettings.custom_style_draw_layer().GetValue();
+
+      const QStringList layerIds = map_->layerIds();
+      self_->ui->layerListWidget->clear();
+      self_->ui->layerListWidget->addItems(layerIds);
+
+      for (int i = 0; i < self_->ui->layerListWidget->count(); i++)
+      {
+         auto* item = self_->ui->layerListWidget->item(i);
+
+         if (match_layer(customStyleDrawLayer, item->text().toStdString()))
+         {
+            self_->ui->layerListWidget->setCurrentItem(item);
+         }
+      }
+   }
+}
+
+CustomLayerDialog::CustomLayerDialog(const QMapLibre::Settings& settings,
+                                     QWidget*                   parent) :
+    QDialog(parent),
+    p {std::make_unique<CustomLayerDialogImpl>(this, settings)},
+    ui(new Ui::CustomLayerDialog)
+{
+   ui->setupUi(this);
+
+   auto&       generalSettings = settings::GeneralSettings::Instance();
+   const auto& customStyleUrl  = generalSettings.custom_style_url().GetValue();
+   const auto  mapProvider =
+      map::GetMapProvider(generalSettings.map_provider().GetValue());
+
+   // TODO render the map with a layer to show what they are selecting
+   p->map_ = std::make_shared<QMapLibre::Map>(
+      nullptr, p->settings_, QSize(1, 1), devicePixelRatioF());
+
+   QString qUrl = QString::fromStdString(customStyleUrl);
+
+   if (mapProvider == map::MapProvider::MapTiler)
+   {
+      qUrl.append("?key=");
+      qUrl.append(map::GetMapProviderApiKey(mapProvider));
+   }
+
+   p->map_->setStyleUrl(qUrl);
+
+   QObject::connect(p->map_.get(),
+                    &QMapLibre::Map::mapChanged,
+                    this,
+                    [this](QMapLibre::Map::MapChange change)
+                    { p->handle_mapChanged(change); });
+}
+
+CustomLayerDialog::~CustomLayerDialog()
+{
+   delete ui;
+}
+
+std::string CustomLayerDialog::selected_layer()
+{
+   return ui->layerListWidget->currentItem()->text().toStdString();
+}
+
+} // namespace scwx::qt::ui
diff --git a/scwx-qt/source/scwx/qt/ui/custom_layer_dialog.hpp b/scwx-qt/source/scwx/qt/ui/custom_layer_dialog.hpp
new file mode 100644
index 00000000..8c03cf71
--- /dev/null
+++ b/scwx-qt/source/scwx/qt/ui/custom_layer_dialog.hpp
@@ -0,0 +1,38 @@
+#pragma once
+
+#include <qmaplibre.hpp>
+#include <QDialog>
+#include <string>
+
+namespace Ui
+{
+class CustomLayerDialog;
+}
+
+namespace scwx::qt::ui
+{
+
+class CustomLayerDialogImpl;
+
+class CustomLayerDialog : public QDialog
+{
+   Q_OBJECT
+
+public:
+   explicit CustomLayerDialog(const QMapLibre::Settings& settings,
+                              QWidget*                   parent = nullptr);
+   ~CustomLayerDialog() override;
+   CustomLayerDialog(const CustomLayerDialog&)            = delete;
+   CustomLayerDialog(CustomLayerDialog&&)                 = delete;
+   CustomLayerDialog& operator=(const CustomLayerDialog&) = delete;
+   CustomLayerDialog& operator=(CustomLayerDialog&&)      = delete;
+
+   std::string selected_layer();
+
+private:
+   friend class CustomLayerDialogImpl;
+   std::unique_ptr<CustomLayerDialogImpl> p;
+   Ui::CustomLayerDialog*                 ui;
+};
+
+} // namespace scwx::qt::ui
diff --git a/scwx-qt/source/scwx/qt/ui/custom_layer_dialog.ui b/scwx-qt/source/scwx/qt/ui/custom_layer_dialog.ui
new file mode 100644
index 00000000..2ce59321
--- /dev/null
+++ b/scwx-qt/source/scwx/qt/ui/custom_layer_dialog.ui
@@ -0,0 +1,96 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>CustomLayerDialog</class>
+ <widget class="QDialog" name="CustomLayerDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>308</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="Minimum" vsizetype="Minimum">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <property name="windowTitle">
+   <string>Custom Map Style Draw Layer</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QListWidget" name="layerListWidget">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Preferred" vsizetype="Expanding">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="editTriggers">
+        <set>QAbstractItemView::EditTrigger::NoEditTriggers</set>
+       </property>
+       <property name="alternatingRowColors">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="orientation">
+      <enum>Qt::Orientation::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::StandardButton::Cancel|QDialogButtonBox::StandardButton::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>CustomLayerDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>CustomLayerDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>
diff --git a/scwx-qt/source/scwx/qt/ui/settings_dialog.cpp b/scwx-qt/source/scwx/qt/ui/settings_dialog.cpp
index 7ce55037..bf5c9180 100644
--- a/scwx-qt/source/scwx/qt/ui/settings_dialog.cpp
+++ b/scwx-qt/source/scwx/qt/ui/settings_dialog.cpp
@@ -24,6 +24,7 @@
 #include <scwx/qt/types/time_types.hpp>
 #include <scwx/qt/types/unit_types.hpp>
 #include <scwx/qt/ui/county_dialog.hpp>
+#include <scwx/qt/ui/custom_layer_dialog.hpp>
 #include <scwx/qt/ui/radar_site_dialog.hpp>
 #include <scwx/qt/ui/serial_port_dialog.hpp>
 #include <scwx/qt/ui/settings/alert_palette_settings_widget.hpp>
@@ -45,6 +46,7 @@
 #include <QPushButton>
 #include <QStandardItemModel>
 #include <QToolButton>
+#include <utility>
 
 namespace scwx
 {
@@ -106,7 +108,8 @@ static const std::unordered_map<std::string, ColorTableConversions>
 class SettingsDialogImpl
 {
 public:
-   explicit SettingsDialogImpl(SettingsDialog* self) :
+   explicit SettingsDialogImpl(SettingsDialog*     self,
+                               QMapLibre::Settings mapSettings) :
        self_ {self},
        radarSiteDialog_ {new RadarSiteDialog(self)},
        alertAudioRadarSiteDialog_ {new RadarSiteDialog(self)},
@@ -114,6 +117,7 @@ public:
        countyDialog_ {new CountyDialog(self)},
        wfoDialog_ {new WFODialog(self)},
        fontDialog_ {new QFontDialog(self)},
+       mapSettings_ {std::move(mapSettings)},
        fontCategoryModel_ {new QStandardItemModel(self)},
        settings_ {std::initializer_list<settings::SettingsInterfaceBase*> {
           &defaultRadarSite_,
@@ -219,6 +223,8 @@ public:
    WFODialog*        wfoDialog_;
    QFontDialog*      fontDialog_;
 
+   QMapLibre::Settings mapSettings_;
+
    QStandardItemModel* fontCategoryModel_;
 
    types::FontCategory selectedFontCategory_ {types::FontCategory::Unknown};
@@ -292,9 +298,10 @@ public:
    std::vector<settings::SettingsInterfaceBase*> settings_;
 };
 
-SettingsDialog::SettingsDialog(QWidget* parent) :
+SettingsDialog::SettingsDialog(const QMapLibre::Settings& mapSettings,
+                               QWidget*                   parent) :
     QDialog(parent),
-    p {std::make_unique<SettingsDialogImpl>(this)},
+    p {std::make_unique<SettingsDialogImpl>(this, mapSettings)},
     ui(new Ui::SettingsDialog)
 {
    ui->setupUi(this);
@@ -685,12 +692,39 @@ void SettingsDialogImpl::SetupGeneralTab()
    customStyleUrl_.SetSettingsVariable(generalSettings.custom_style_url());
    customStyleUrl_.SetEditWidget(self_->ui->customMapUrlLineEdit);
    customStyleUrl_.SetResetButton(self_->ui->resetCustomMapUrlButton);
+   customStyleUrl_.SetInvalidTooltip(
+      "Remove anything following \"?key=\" in the URL");
    customStyleUrl_.EnableTrimming();
 
    customStyleDrawLayer_.SetSettingsVariable(
       generalSettings.custom_style_draw_layer());
    customStyleDrawLayer_.SetEditWidget(self_->ui->customMapLayerLineEdit);
    customStyleDrawLayer_.SetResetButton(self_->ui->resetCustomMapLayerButton);
+   QObject::connect(
+      self_->ui->customMapLayerToolButton,
+      &QAbstractButton::clicked,
+      self_,
+      [this]()
+      {
+         // WA_DeleteOnClose manages memory
+         // NOLINTNEXTLINE(cppcoreguidelines-owning-memory)
+         auto* customLayerDialog = new ui::CustomLayerDialog(mapSettings_);
+         customLayerDialog->setAttribute(Qt::WA_DeleteOnClose);
+         QObject::connect(
+            customLayerDialog,
+            &QDialog::accepted,
+            self_,
+            [this, customLayerDialog]()
+            {
+               auto newLayer = customLayerDialog->selected_layer();
+               self_->ui->customMapLayerLineEdit->setText(newLayer.c_str());
+               // setText does not emit the textEdited signal
+               Q_EMIT
+               self_->ui->customMapLayerLineEdit->textEdited(newLayer.c_str());
+            });
+
+         customLayerDialog->open();
+      });
 
    defaultAlertAction_.SetSettingsVariable(
       generalSettings.default_alert_action());
diff --git a/scwx-qt/source/scwx/qt/ui/settings_dialog.hpp b/scwx-qt/source/scwx/qt/ui/settings_dialog.hpp
index 82f00905..b767aa0b 100644
--- a/scwx-qt/source/scwx/qt/ui/settings_dialog.hpp
+++ b/scwx-qt/source/scwx/qt/ui/settings_dialog.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <QDialog>
+#include <qmaplibre.hpp>
 
 namespace Ui
 {
@@ -24,7 +25,8 @@ private:
    Q_DISABLE_COPY(SettingsDialog)
 
 public:
-   explicit SettingsDialog(QWidget* parent = nullptr);
+   explicit SettingsDialog(const QMapLibre::Settings& mapSettings,
+                           QWidget*                   parent = nullptr);
    ~SettingsDialog();
 
 private:
diff --git a/scwx-qt/source/scwx/qt/ui/settings_dialog.ui b/scwx-qt/source/scwx/qt/ui/settings_dialog.ui
index bb2389bc..f14c6a96 100644
--- a/scwx-qt/source/scwx/qt/ui/settings_dialog.ui
+++ b/scwx-qt/source/scwx/qt/ui/settings_dialog.ui
@@ -122,7 +122,7 @@
           </sizepolicy>
          </property>
          <property name="currentIndex">
-          <number>3</number>
+          <number>0</number>
          </property>
          <widget class="QWidget" name="general">
           <layout class="QVBoxLayout" name="verticalLayout_2">
@@ -135,9 +135,9 @@
               <property name="geometry">
                <rect>
                 <x>0</x>
-                <y>-303</y>
+                <y>-260</y>
                 <width>511</width>
-                <height>733</height>
+                <height>812</height>
                </rect>
               </property>
               <layout class="QVBoxLayout" name="verticalLayout">
@@ -608,6 +608,13 @@
                     </property>
                    </widget>
                   </item>
+                  <item row="15" column="3">
+                   <widget class="QToolButton" name="customMapLayerToolButton">
+                    <property name="text">
+                     <string>...</string>
+                    </property>
+                   </widget>
+                  </item>
                  </layout>
                 </widget>
                </item>
@@ -714,8 +721,8 @@
                    <rect>
                     <x>0</x>
                     <y>0</y>
-                    <width>98</width>
-                    <height>28</height>
+                    <width>80</width>
+                    <height>18</height>
                    </rect>
                   </property>
                   <layout class="QGridLayout" name="gridLayout_3">