diff --git a/.env.example b/.env.example
index e3495bf..f23ac27 100644
--- a/.env.example
+++ b/.env.example
@@ -67,6 +67,13 @@ LAYOUT=modern
 # Only uncomment if you have your own proxy running
 # DXSPIDER_PROXY_URL=https://your-dxspider-proxy.com
 
+# DX Cluster source: auto | proxy | hamqth | dxspider
+# auto = tries proxy first, then HamQTH, then direct telnet
+# proxy = use DX Spider Proxy (set DXSPIDER_PROXY_URL above)
+# hamqth = HamQTH CSV feed (HTTP, works everywhere)
+# dxspider = direct telnet to DX Spider nodes (works locally/Pi)
+# DX_CLUSTER_SOURCE=auto
+
 # OpenWeatherMap API key (for local weather display)
 # Get a free key at https://openweathermap.org/api
 # OPENWEATHER_API_KEY=your_api_key_here
diff --git a/scripts/setup-pi.sh b/scripts/setup-pi.sh
index d3ab463..ee79218 100644
--- a/scripts/setup-pi.sh
+++ b/scripts/setup-pi.sh
@@ -225,6 +225,9 @@ else
     CHROME_CMD="chromium-browser"
 fi
 
+# Trap Ctrl+Q to exit kiosk cleanly
+trap 'pkill -f "chromium.*kiosk"; exit 0' SIGTERM SIGINT
+
 $CHROME_CMD \
     --kiosk \
     --noerrdialogs \
@@ -237,7 +240,17 @@ $CHROME_CMD \
     --overscroll-history-navigation=0 \
     --disable-pinch \
     --incognito \
-    http://localhost:3000
+    http://localhost:3000 &
+
+CHROME_PID=$!
+
+echo "OpenHamClock kiosk running (PID: $CHROME_PID)"
+echo "Exit methods:"
+echo "  - Alt+F4        (close Chromium)"
+echo "  - Ctrl+Alt+T    (open terminal, then: pkill -f kiosk)"
+echo "  - SSH in and run: pkill -f kiosk.sh"
+
+wait $CHROME_PID
 EOF
     
     chmod +x "$INSTALL_DIR/kiosk.sh"
@@ -339,7 +352,14 @@ print_summary() {
     if [ "$KIOSK_MODE" = true ]; then
         echo -e "  ${GREEN}Kiosk Mode:${NC} Enabled"
         echo "    OpenHamClock will auto-start on boot in fullscreen"
-        echo "    To disable: rm ~/.config/autostart/openhamclock-kiosk.desktop"
+        echo ""
+        echo -e "    ${YELLOW}Exit kiosk:${NC}"
+        echo "      Alt+F4          Close Chromium"
+        echo "      Ctrl+Alt+T      Open terminal (then: pkill -f kiosk)"
+        echo "      SSH:            pkill -f kiosk.sh"
+        echo ""
+        echo -e "    ${YELLOW}Disable auto-start:${NC}"
+        echo "      rm ~/.config/autostart/openhamclock-kiosk.desktop"
         echo ""
     fi
     
diff --git a/server.js b/server.js
index e335222..c53244b 100644
--- a/server.js
+++ b/server.js
@@ -148,7 +148,7 @@ const CONFIG = {
   
   // DX Cluster settings
   spotRetentionMinutes: parseInt(process.env.SPOT_RETENTION_MINUTES) || jsonConfig.dxCluster?.spotRetentionMinutes || 30,
-  dxClusterSource: jsonConfig.dxCluster?.source || 'auto',
+  dxClusterSource: process.env.DX_CLUSTER_SOURCE || jsonConfig.dxCluster?.source || 'auto',
   
   // API keys (don't expose to frontend)
   _openWeatherApiKey: process.env.OPENWEATHER_API_KEY || '',
@@ -983,7 +983,7 @@ let dxSpiderCache = { spots: [], timestamp: 0 };
 const DXSPIDER_CACHE_TTL = 90000; // 90 seconds cache - reduces reconnection frequency
 
 app.get('/api/dxcluster/spots', async (req, res) => {
-  const source = (req.query.source || 'auto').toLowerCase();
+  const source = (req.query.source || CONFIG.dxClusterSource || 'auto').toLowerCase();
   
   // Helper function for HamQTH (HTTP-based, works everywhere)
   async function fetchHamQTH() {
diff --git a/src/App.jsx b/src/App.jsx
index 39f1c63..b10ab3b 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -460,7 +460,7 @@ const App = () => {
                 </div>
                 <div style={{ marginBottom: '6px' }}>
                   <div style={{ color: '#888' }}>Kp</div>
-                  <div style={{ color: '#00ff00', fontSize: '16px', fontWeight: '700' }}>{spaceWeather?.data?.kIndex ?? '--'}</div>
+                  <div style={{ color: '#00ff00', fontSize: '16px', fontWeight: '700' }}>{solarIndices?.data?.kp?.current ?? spaceWeather?.data?.kIndex ?? '--'}</div>
                 </div>
                 <div style={{ marginBottom: '6px' }}>
                   <div style={{ color: '#888' }}>Bz</div>
@@ -596,6 +596,7 @@ const App = () => {
           localDate={localDate}
           localWeather={localWeather}
           spaceWeather={spaceWeather}
+          solarIndices={solarIndices}
           use12Hour={use12Hour}
           onTimeFormatToggle={handleTimeFormatToggle}
           onSettingsClick={() => setShowSettings(true)}
diff --git a/src/components/DXFilterManager.jsx b/src/components/DXFilterManager.jsx
index 377da25..a9c69b6 100644
--- a/src/components/DXFilterManager.jsx
+++ b/src/components/DXFilterManager.jsx
@@ -279,7 +279,7 @@ export const DXFilterManager = ({ filters, onFilterChange, isOpen, onClose }) =>
     <div>
       <div style={{ marginBottom: '16px' }}>
         <div style={{ fontSize: '13px', fontWeight: '600', color: 'var(--text-primary)', marginBottom: '8px' }}>
-          Exclude List - Hide these callsigns
+          Exclude List - Hide DX callsigns beginning with:
         </div>
         <div style={{ display: 'flex', gap: '8px' }}>
           <input
diff --git a/src/components/Header.jsx b/src/components/Header.jsx
index 9067f56..afcdd1d 100644
--- a/src/components/Header.jsx
+++ b/src/components/Header.jsx
@@ -12,6 +12,7 @@ export const Header = ({
   localDate,
   localWeather,
   spaceWeather,
+  solarIndices,
   use12Hour,
   onTimeFormatToggle,
   onSettingsClick,
@@ -37,8 +38,8 @@ export const Header = ({
       <div style={{ display: 'flex', alignItems: 'center', gap: '12px', flexShrink: 0 }}>
         <span
           style={{
-            fontSize: config.callsignSize > 0.1 && config.callsignSize <= 2
-              ? `${22 * config.callsignSize}px`
+            fontSize: config.headerSize > 0.1 && config.headerSize <= 2
+              ? `${22 * config.headerSize}px`
               : "22px", fontWeight: '900', color: 'var(--accent-amber)', cursor: 'pointer', fontFamily: 'Orbitron, monospace', whiteSpace: 'nowrap'
           }}
           onClick={onSettingsClick}
@@ -53,7 +54,9 @@ export const Header = ({
       <div style={{ display: 'flex', alignItems: 'center', gap: '6px', flexShrink: 0 }}>
         <span style={{ fontSize: '13px', color: 'var(--accent-cyan)', fontWeight: '600' }}>UTC</span>
         <span style={{
-          fontSize: '24px',
+          fontSize: config.headerSize > 0.1 && config.headerSize <= 2
+              ? `${24 * config.headerSize}px`
+              : "24px",
           fontWeight: '700',
           color: 'var(--accent-cyan)',
           fontFamily: 'JetBrains Mono, Consolas, monospace',
@@ -70,7 +73,9 @@ export const Header = ({
       >
         <span style={{ fontSize: '13px', color: 'var(--accent-amber)', fontWeight: '600' }}>LOCAL</span>
         <span style={{
-          fontSize: '24px',
+          fontSize: config.headerSize > 0.1 && config.headerSize <= 2
+              ? `${24 * config.headerSize}px`
+              : "24px",
           fontWeight: '700',
           color: 'var(--accent-amber)',
           fontFamily: 'JetBrains Mono, Consolas, monospace',
@@ -90,8 +95,18 @@ export const Header = ({
           const windLabel = localWeather.data.windUnit || 'mph';
           return (
             <div title={`${localWeather.data.description} • Wind: ${localWeather.data.windSpeed} ${windLabel}`}>
-              <span style={{ marginRight: '3px' }}>{localWeather.data.icon}</span>
-              <span style={{ color: 'var(--accent-cyan)', fontWeight: '600' }}>
+              <span style={{ marginRight: '3px', 
+                fontSize: config.headerSize > 0.1 && config.headerSize <= 2
+                  ? `${12 * config.headerSize}px`
+                  : "12px",
+               }}>
+                {localWeather.data.icon}
+              </span>
+              <span style={{ color: 'var(--accent-cyan)', fontWeight: '600',
+                fontSize: config.headerSize > 0.1 && config.headerSize <= 2
+                  ? `${12 * config.headerSize}px`
+                  : "12px",
+               }}>
                 {tempF}°F/{tempC}°C
               </span>
             </div>
@@ -99,17 +114,17 @@ export const Header = ({
         })()}
         <div>
           <span style={{ color: 'var(--text-muted)' }}>SFI </span>
-          <span style={{ color: 'var(--accent-amber)', fontWeight: '700' }}>{spaceWeather?.data?.solarFlux || '--'}</span>
+          <span style={{ color: 'var(--accent-amber)', fontWeight: '700' }}>{solarIndices?.data?.sfi?.current || spaceWeather?.data?.solarFlux || '--'}</span>
         </div>
         <div>
           <span style={{ color: 'var(--text-muted)' }}>K </span>
-          <span style={{ color: parseInt(spaceWeather?.data?.kIndex) >= 4 ? 'var(--accent-red)' : 'var(--accent-green)', fontWeight: '700' }}>
-            {spaceWeather?.data?.kIndex ?? '--'}
+          <span style={{ color: parseInt(solarIndices?.data?.kp?.current ?? spaceWeather?.data?.kIndex) >= 4 ? 'var(--accent-red)' : 'var(--accent-green)', fontWeight: '700' }}>
+            {solarIndices?.data?.kp?.current ?? spaceWeather?.data?.kIndex ?? '--'}
           </span>
         </div>
         <div>
           <span style={{ color: 'var(--text-muted)' }}>SSN </span>
-          <span style={{ color: 'var(--accent-cyan)', fontWeight: '700' }}>{spaceWeather?.data?.sunspotNumber || '--'}</span>
+          <span style={{ color: 'var(--accent-cyan)', fontWeight: '700' }}>{solarIndices?.data?.ssn?.current || spaceWeather?.data?.sunspotNumber || '--'}</span>
         </div>
       </div>
 
diff --git a/src/components/SettingsPanel.jsx b/src/components/SettingsPanel.jsx
index de58466..54bb296 100644
--- a/src/components/SettingsPanel.jsx
+++ b/src/components/SettingsPanel.jsx
@@ -9,7 +9,7 @@ import { LANGUAGES } from '../lang/i18n.js';
 
 export const SettingsPanel = ({ isOpen, onClose, config, onSave }) => {
   const [callsign, setCallsign] = useState(config?.callsign || '');
-  const [callsignSize, setCallsignSize] = useState(config?.callsignSize || 1.0);
+  const [headerSize, setheaderSize] = useState(config?.headerSize || 1.0);
   const [gridSquare, setGridSquare] = useState('');
   const [lat, setLat] = useState(config?.location?.lat || 0);
   const [lon, setLon] = useState(config?.location?.lon || 0);
@@ -26,7 +26,7 @@ export const SettingsPanel = ({ isOpen, onClose, config, onSave }) => {
   useEffect(() => {
     if (config) {
       setCallsign(config.callsign || '');
-      setCallsignSize(config.callsignSize || 1.0)
+      setheaderSize(config.headerSize || 1.0)
       setLat(config.location?.lat || 0);
       setLon(config.location?.lon || 0);
       setTheme(config.theme || 'dark');
@@ -149,7 +149,7 @@ export const SettingsPanel = ({ isOpen, onClose, config, onSave }) => {
     onSave({
       ...config,
       callsign: callsign.toUpperCase(),
-      callsignSize: callsignSize,
+      headerSize: headerSize,
       location: { lat: parseFloat(lat), lon: parseFloat(lon) },
       theme,
       layout,
@@ -309,15 +309,15 @@ export const SettingsPanel = ({ isOpen, onClose, config, onSave }) => {
             <div style={{ marginBottom: '20px'}}>
               <div>
                 <label style={{ display: 'block', marginBottom: '6px', color: 'var(--text-muted)', fontSize: '11px', textTransform: 'uppercase' }}>
-                  {t('station.settings.callsignSize')}
+                  {t('station.settings.headerSize')}
                 </label>
                 <input
                   type="number"
                   step="0.1"
-                  value={isNaN(lat) ? '' : callsignSize}
+                  value={isNaN(lat) ? '' : headerSize}
                   onChange={(e) => {
                     if (e.target.value >= 0.1 && e.target.value <= 2.0) {
-                      setCallsignSize(e.target.value)
+                      setheaderSize(e.target.value)
                     }}}
                   style={{
                     width: '100%',
diff --git a/src/hooks/useDXCluster.js b/src/hooks/useDXCluster.js
index 83a7303..60a574c 100644
--- a/src/hooks/useDXCluster.js
+++ b/src/hooks/useDXCluster.js
@@ -26,17 +26,15 @@ export const useDXCluster = (source = 'auto', filters = {}) => {
       // Watchlist only mode - must match watchlist
       if (filters.watchlistOnly && filters.watchlist?.length > 0) {
         const matchesWatchlist = filters.watchlist.some(w => 
-          spot.call?.toUpperCase().includes(w.toUpperCase()) ||
-          spot.spotter?.toUpperCase().includes(w.toUpperCase())
+          spot.call?.toUpperCase().includes(w.toUpperCase())
         );
         if (!matchesWatchlist) return false;
       }
       
-      // Exclude list - hide matching calls
+      // Exclude list - hide matching calls - match the call as a prefix
       if (filters.excludeList?.length > 0) {
         const isExcluded = filters.excludeList.some(exc =>
-          spot.call?.toUpperCase().includes(exc.toUpperCase()) ||
-          spot.spotter?.toUpperCase().includes(exc.toUpperCase())
+          spot.call?.toUpperCase().startsWith(exc.toUpperCase())
         );
         if (isExcluded) return false;
       }
@@ -89,7 +87,7 @@ export const useDXCluster = (source = 'auto', filters = {}) => {
   useEffect(() => {
     const fetchData = async () => {
       try {
-        const response = await fetch('/api/dxcluster/spots');
+        const response = await fetch(`/api/dxcluster/spots?source=${encodeURIComponent(source)}`);
         if (response.ok) {
           const newSpots = await response.json();
           
diff --git a/src/hooks/useWSJTX.js b/src/hooks/useWSJTX.js
index 6523a77..eb3709a 100644
--- a/src/hooks/useWSJTX.js
+++ b/src/hooks/useWSJTX.js
@@ -14,20 +14,20 @@ const API_URL = '/api/wsjtx';
 const DECODES_URL = '/api/wsjtx/decodes';
 
 // Generate or retrieve persistent session ID
+// NOTE: Kept short (8 chars) intentionally — long UUIDs in query strings
+// trigger false positives in Bitdefender and similar security software
 function getSessionId() {
   const KEY = 'ohc-wsjtx-session';
+  const generate = () => Math.random().toString(36).substring(2, 10);
   try {
     let id = localStorage.getItem(KEY);
-    if (id && id.length >= 16) return id;
-    // Generate a random ID
-    id = (typeof crypto !== 'undefined' && crypto.randomUUID)
-      ? crypto.randomUUID()
-      : Math.random().toString(36).substring(2) + Date.now().toString(36) + Math.random().toString(36).substring(2);
+    if (id && id.length >= 8) return id;
+    id = generate();
     localStorage.setItem(KEY, id);
     return id;
   } catch {
     // Fallback for privacy browsers that block localStorage
-    return Math.random().toString(36).substring(2) + Date.now().toString(36) + Math.random().toString(36).substring(2);
+    return generate();
   }
 }
 
diff --git a/src/lang/de.json b/src/lang/de.json
index 8f2d6cc..7f23a69 100644
--- a/src/lang/de.json
+++ b/src/lang/de.json
@@ -9,6 +9,7 @@
   "station.settings.language.ja": "日本語",
   "station.settings.language.it": "Italiano",
   "station.settings.language.nl": "Nederlands",
+  "station.settings.language.ko": "한국어",
   "station.settings.altitude": "Höhe (m)",
   "station.settings.antenna": "Antenne",
   "station.settings.button.save": "Einstellungen Speichern",
@@ -45,5 +46,12 @@
   "station.settings.useLocation": "📍 Meinen Standort verwenden",
   "station.settings.useLocation.error1": "Standort konnte nicht ermittelt werden. Bitte manuell eingeben.",
   "station.settings.useLocation.error2": "Geolokalisierung wird von deinem Browser nicht unterstützt.",
-  "station.settings.welcome": "👋 Willkommen bei OpenHamClock!"
+  "station.settings.welcome": "👋 Willkommen bei OpenHamClock!",
+  "plugins.layers.aurora.name": "Aurora-Vorhersage",
+  "plugins.layers.aurora.description": "NOAA-OVATION-Aurora-Wahrscheinlichkeitsvorhersage (30 Min.)",
+  "plugins.layers.earthquakes.name": "Erdbeben",
+  "plugins.layers.earthquakes.description": "Live-USGS-Erdbebendaten (M2,5+ der letzten 24 Stunden)",
+  "plugins.layers.wxradar.name": "Wetterradar",
+  "plugins.layers.wxradar.description": "NEXRAD-Wetterradar-Überlagerung für Nordamerika",
+  "plugins.layers.wxradar.attribution": "Wetterdaten © Iowa State University Mesonet"
 }
diff --git a/src/lang/en.json b/src/lang/en.json
index c1b753c..49a03bd 100644
--- a/src/lang/en.json
+++ b/src/lang/en.json
@@ -9,12 +9,13 @@
   "station.settings.language.ja": "日本語",
   "station.settings.language.it": "Italiano",
   "station.settings.language.nl": "Nederlands",
+  "station.settings.language.ko": "한국어",
   "station.settings.altitude": "Altitude (m)",
   "station.settings.antenna": "Antenna",
   "station.settings.button.save": "Save Settings",
   "station.settings.button.save.confirm": "Settings saved to your browser",
   "station.settings.callsign": "Your Callsign",
-  "station.settings.callsignSize": "Your Callsign's size",
+  "station.settings.headerSize": "Your Callsign's size",
   "station.settings.describe": "Enter your callsign and grid square to get started. Settings are saved in your browser.",
   "station.settings.dx.describe": "→ Real-time DX Spider feed via our dedicated proxy service",
   "station.settings.dx.option1": "⭐ DX Spider Proxy (Recommended)",
@@ -46,5 +47,12 @@
   "station.settings.useLocation": "📍 Use my current location",
   "station.settings.useLocation.error1": "Could not get location. Please enter manually.",
   "station.settings.useLocation.error2": "Geolocation is not supported by your browser.",
-  "station.settings.welcome": "👋 Welcome to OpenHamClock!"
+  "station.settings.welcome": "👋 Welcome to OpenHamClock!",
+  "plugins.layers.aurora.name": "Aurora Forecast",
+  "plugins.layers.aurora.description": "NOAA OVATION aurora probability forecast (30-min)",
+  "plugins.layers.earthquakes.name": "Earthquakes",
+  "plugins.layers.earthquakes.description": "Live USGS earthquake data (M2.5+ from last 24 hours)",
+  "plugins.layers.wxradar.name": "Weather Radar",
+  "plugins.layers.wxradar.description": "NEXRAD weather radar overlay for North America",
+  "plugins.layers.wxradar.attribution": "Weather data © Iowa State University Mesonet"
 }
diff --git a/src/lang/es.json b/src/lang/es.json
index 4454640..4bda44d 100644
--- a/src/lang/es.json
+++ b/src/lang/es.json
@@ -9,12 +9,13 @@
   "station.settings.language.ja": "日本語",
   "station.settings.language.it": "Italiano",
   "station.settings.language.nl": "Nederlands",
+  "station.settings.language.ko": "한국어",
   "station.settings.altitude": "Altitud (m)",
   "station.settings.antenna": "Antena",
   "station.settings.button.save": "Guardar Configuración",
   "station.settings.button.save.confirm": "La configuración se guarda en tu navegador",
   "station.settings.callsign": "Tu Indicativo",
-  "station.settings.callsignSize": "El tamaño de tu Indicativo",
+  "station.settings.headerSize": "El tamaño de tu Indicativo",
   "station.settings.describe": "Ingresa tu indicativo y cuadrícula para comenzar. Tu configuración se guardará en el navegador.",
   "station.settings.dx.describe": "→ Feed en tiempo real de DX Spider a través de nuestro servicio proxy dedicado",
   "station.settings.dx.option1": "⭐ Proxy DX Spider (Recomendado)",
@@ -46,5 +47,12 @@
   "station.settings.useLocation": "📍 Usar Mi Ubicación Actual",
   "station.settings.useLocation.error1": "No se pudo obtener la ubicación. Por favor ingrésala manualmente.",
   "station.settings.useLocation.error2": "La geolocalización no es compatible con tu navegador.",
-  "station.settings.welcome": "👋 ¡Bienvenido a OpenHamClock!"
+  "station.settings.welcome": "👋 ¡Bienvenido a OpenHamClock!",
+  "plugins.layers.aurora.name": "Pronóstico de auroras",
+  "plugins.layers.aurora.description": "Pronóstico de probabilidad de auroras NOAA OVATION (30 min)",
+  "plugins.layers.earthquakes.name": "Terremotos",
+  "plugins.layers.earthquakes.description": "Datos sísmicos en vivo del USGS (M2.5+ de las últimas 24 horas)",
+  "plugins.layers.wxradar.name": "Radar meteorológico",
+  "plugins.layers.wxradar.description": "Superposición del radar meteorológico NEXRAD para Norteamérica",
+  "plugins.layers.wxradar.attribution": "Datos meteorológicos © Iowa State University Mesonet"
 }
diff --git a/src/lang/fr.json b/src/lang/fr.json
index 89e6678..cae97fc 100644
--- a/src/lang/fr.json
+++ b/src/lang/fr.json
@@ -9,6 +9,7 @@
   "station.settings.language.ja": "日本語",
   "station.settings.language.it": "Italiano",
   "station.settings.language.nl": "Nederlands",
+  "station.settings.language.ko": "한국어",
   "station.settings.altitude": "Altitude (m)",
   "station.settings.antenna": "Antenne",
   "station.settings.button.save": "Enregistrer les paramètres",
@@ -45,5 +46,12 @@
   "station.settings.useLocation": "📍 Utiliser ma position actuelle",
   "station.settings.useLocation.error1": "Impossible d'obtenir la position. Veuillez entrer manuellement.",
   "station.settings.useLocation.error2": "La géolocalisation n'est pas prise en charge par votre navigateur.",
-  "station.settings.welcome": "👋 Bienvenue sur OpenHamClock !"
+  "station.settings.welcome": "👋 Bienvenue sur OpenHamClock !",
+  "plugins.layers.aurora.name": "Prévision d’aurores",
+  "plugins.layers.aurora.description": "Prévision de probabilité d’aurores NOAA OVATION (30 min)",
+  "plugins.layers.earthquakes.name": "Séismes",
+  "plugins.layers.earthquakes.description": "Données sismiques USGS en direct (M2,5+ sur les dernières 24 heures)",
+  "plugins.layers.wxradar.name": "Radar météo",
+  "plugins.layers.wxradar.description": "Surcouche du radar météo NEXRAD pour l’Amérique du Nord",
+  "plugins.layers.wxradar.attribution": "Données météo © Iowa State University Mesonet"
 }
diff --git a/src/lang/i18n.js b/src/lang/i18n.js
index 8db84f2..e7df127 100644
--- a/src/lang/i18n.js
+++ b/src/lang/i18n.js
@@ -10,6 +10,7 @@ import translationPT from './pt.json';
 import translationJA from './ja.json';
 import translationIT from './it.json';
 import translationNL from './nl.json';
+import translationKO from './ko.json';
 
 export const LANGUAGES = [
   { code: 'en', name: 'English', flag: '🇬🇧' },
@@ -19,6 +20,7 @@ export const LANGUAGES = [
   { code: 'nl', name: 'Nederlands', flag: '🇳🇱' },
   { code: 'pt', name: 'Português', flag: '🇧🇷' },
   { code: 'ja', name: '日本語', flag: '🇯🇵' },
+  { code: 'ko', name: '한국어', flag: '🇰🇷' },
   { code: 'it', name: 'Italiano', flag: '🇮🇹' }
 ];
 
@@ -30,6 +32,7 @@ export const resources = {
   nl: { translation: translationNL },
   pt: { translation: translationPT },
   ja: { translation: translationJA },
+  ko: { translation: translationKO },
   it: { translation: translationIT }
 };
 
diff --git a/src/lang/it.json b/src/lang/it.json
index f623702..b18d457 100644
--- a/src/lang/it.json
+++ b/src/lang/it.json
@@ -9,6 +9,7 @@
   "station.settings.language.ja": "日本語",
   "station.settings.language.it": "Italiano",
   "station.settings.language.nl": "Nederlands",
+  "station.settings.language.ko": "한국어",
   "station.settings.altitude": "Altitudine (m)",
   "station.settings.antenna": "Antenna",
   "station.settings.button.save": "Salva Impostazioni",
@@ -45,5 +46,12 @@
   "station.settings.useLocation": "📍 Usa la Mia Posizione Attuale",
   "station.settings.useLocation.error1": "Impossibile ottenere la posizione. Inseriscila manualmente.",
   "station.settings.useLocation.error2": "La geolocalizzazione non è supportata dal tuo browser.",
-  "station.settings.welcome": "👋 Benvenuto su OpenHamClock!"
+  "station.settings.welcome": "👋 Benvenuto su OpenHamClock!",
+  "plugins.layers.aurora.name": "Previsione dell’aurora",
+  "plugins.layers.aurora.description": "Previsione di probabilità dell’aurora NOAA OVATION (30 min)",
+  "plugins.layers.earthquakes.name": "Terremoti",
+  "plugins.layers.earthquakes.description": "Dati sismici USGS in tempo reale (M2,5+ delle ultime 24 ore)",
+  "plugins.layers.wxradar.name": "Radar meteorologico",
+  "plugins.layers.wxradar.description": "Sovrapposizione del radar meteorologico NEXRAD per il Nord America",
+  "plugins.layers.wxradar.attribution": "Dati meteo © Iowa State University Mesonet"
 }
diff --git a/src/lang/ja.json b/src/lang/ja.json
index 474ee6d..59d4447 100644
--- a/src/lang/ja.json
+++ b/src/lang/ja.json
@@ -9,6 +9,7 @@
   "station.settings.language.ja": "日本語",
   "station.settings.language.it": "Italiano",
   "station.settings.language.nl": "Nederlands",
+  "station.settings.language.ko": "한국어",
   "station.settings.altitude": "標高 (m)",
   "station.settings.antenna": "アンテナ",
   "station.settings.button.save": "設定を保存",
@@ -45,5 +46,12 @@
   "station.settings.useLocation": "📍 現在地を使用",
   "station.settings.useLocation.error1": "位置情報を取得できません。手動で入力してください。",
   "station.settings.useLocation.error2": "お使いのブラウザはジオロケーションに対応していません。",
-  "station.settings.welcome": "👋 OpenHamClockへようこそ！"
+  "station.settings.welcome": "👋 OpenHamClockへようこそ！",
+  "plugins.layers.aurora.name": "オーロラ予報",
+  "plugins.layers.aurora.description": "NOAA OVATION オーロラ出現確率予報（30分）",
+  "plugins.layers.earthquakes.name": "地震",
+  "plugins.layers.earthquakes.description": "USGSのリアルタイム地震データ（過去24時間のM2.5以上）",
+  "plugins.layers.wxradar.name": "気象レーダー",
+  "plugins.layers.wxradar.description": "北米向けNEXRAD気象レーダーのオーバーレイ",
+  "plugins.layers.wxradar.attribution": "気象データ © Iowa State University Mesonet"
 }
diff --git a/src/lang/ko.json b/src/lang/ko.json
new file mode 100644
index 0000000..8d703c0
--- /dev/null
+++ b/src/lang/ko.json
@@ -0,0 +1,57 @@
+{
+  "cancel": "취소",
+  "station.settings.language": "언어",
+  "station.settings.language.en": "English",
+  "station.settings.language.fr": "Français",
+  "station.settings.language.es": "Español",
+  "station.settings.language.de": "Deutsch",
+  "station.settings.language.pt": "Português",
+  "station.settings.language.ja": "日本語",
+  "station.settings.language.it": "Italiano",
+  "station.settings.language.nl": "Nederlands",
+  "station.settings.language.ko": "한국어",
+  "station.settings.altitude": "고도 (m)",
+  "station.settings.antenna": "안테나",
+  "station.settings.button.save": "설정 저장하기",
+  "station.settings.button.save.confirm": "설정이 브라우저에 저장되었습니다.",
+  "station.settings.callsign": "콜사인",
+  "station.settings.describe": "콜사인과 그리드 스퀘어(예: PM37mp)를 입력하여 시작하세요. 설정은 브라우저에 저장됩니다.",
+  "station.settings.dx.describe": "→ 자체 프록시 서버를 이용한 실시간 DX Spider 연동",
+  "station.settings.dx.option1": "⭐ DX Spider 프록시 (권장)",
+  "station.settings.dx.option2": "HamQTH Cluster",
+  "station.settings.dx.option3": "DXWatch",
+  "station.settings.dx.option4": "자동 (전부 시도하기)",
+  "station.settings.dx.title": "DX Cluster 데이터 서버",
+  "station.settings.layout": "레이아웃",
+  "station.settings.layout.classic": "클래식",
+  "station.settings.layout.classic.describe": "→ HamClock과 유사한 레이아웃",
+  "station.settings.layout.modern": "모던",
+  "station.settings.layout.modern.describe": "→ 반응형 모던 그리드 레이아웃",
+  "station.settings.latitude": "위도",
+  "station.settings.locator": "그리드 스퀘어 (또는 아래에 직접 위도/경도 입력)",
+  "station.settings.longitude": "경도",
+  "station.settings.power": "출력 (W)",
+  "station.settings.theme": "테마",
+  "station.settings.theme.dark": "다크",
+  "station.settings.theme.dark.describe": "→ 현대적인 다크 테마 (기본)",
+  "station.settings.theme.legacy": "CRT",
+  "station.settings.theme.legacy.describe": "→ 초록 CRT 터미널 스타일",
+  "station.settings.theme.light": "라이트",
+  "station.settings.theme.light.describe": "→ 낮 시간 사용을 위한 밝은 테마",
+  "station.settings.theme.retro": "레트로",
+  "station.settings.theme.retro.describe": "→ 90년대 Windows 레트로 스타일",
+  "station.settings.timezone": "시간대",
+  "station.settings.title": "무선국 설정",
+  "station.settings.tip.env": "💡 팁: 영구적인 데이터 저장을 위해 <envExample>.env.example</envExample> 파일을 복사해 <env>.env</env> 파일을 덮어쓰고 CALLSIGN 과 LOCATOR 필드를 채우세요.",
+  "station.settings.useLocation": "📍 현재 내 위치 사용",
+  "station.settings.useLocation.error1": "위치 정보를 가져올 수 없습니다. 위도와 경도를 수동으로 입력해 주세요.",
+  "station.settings.useLocation.error2": "브라우저가 위치 정보 기능을 지원하지 않습니다.",
+  "station.settings.welcome": "👋 OpenHamClock에 오신 것을 환영합니다!",
+  "plugins.layers.aurora.name": "오로라 예보",
+  "plugins.layers.aurora.description": "NOAA OVATION 오로라 확률 예보 (30분)",
+  "plugins.layers.earthquakes.name": "실시간 지진 현황",
+  "plugins.layers.earthquakes.description": "USGS 실시간 지진 데이터 (지난 24시간 동안 일어난 규모 M2.5 이상의 지진)",
+  "plugins.layers.wxradar.name": "기상 레이더",
+  "plugins.layers.wxradar.description": "북아메리카 지역 NEXRAD 기상 레이더 오버레이",
+  "plugins.layers.wxradar.attribution": "기상 데이터 © Iowa State University Mesonet"
+}
diff --git a/src/lang/nl.json b/src/lang/nl.json
index 2a02524..b45fcb5 100644
--- a/src/lang/nl.json
+++ b/src/lang/nl.json
@@ -9,6 +9,7 @@
   "station.settings.language.ja": "日本語",
   "station.settings.language.it": "Italiaans",
   "station.settings.language.nl": "Nederlands",
+  "station.settings.language.ko": "한국어",
   "station.settings.altitude": "Hoogte (m)",
   "station.settings.antenna": "Antenne",
   "station.settings.button.save": "Bewaar Settings",
@@ -45,5 +46,12 @@
   "station.settings.useLocation": "📍 Gebruik mijn huidige locatie",
   "station.settings.useLocation.error1": "Kan niet de locatie vinden. Graag handmatig ingeven.",
   "station.settings.useLocation.error2": "Geolocation is niet beschikbaar op je browser.",
-  "station.settings.welcome": "👋 Welkom bij OpenHamClock!"
+  "station.settings.welcome": "👋 Welkom bij OpenHamClock!",
+  "plugins.layers.aurora.name": "Auroravoorspelling",
+  "plugins.layers.aurora.description": "NOAA OVATION-voorspelling van aurorakans (30 min)",
+  "plugins.layers.earthquakes.name": "Aardbevingen",
+  "plugins.layers.earthquakes.description": "Live USGS-aardbevingsgegevens (M2,5+ van de afgelopen 24 uur)",
+  "plugins.layers.wxradar.name": "Weerradar",
+  "plugins.layers.wxradar.description": "NEXRAD-weerradaroverlay voor Noord-Amerika",
+  "plugins.layers.wxradar.attribution": "Weergegevens © Iowa State University Mesonet"
 }
diff --git a/src/lang/pt.json b/src/lang/pt.json
index 92da6c1..8091927 100644
--- a/src/lang/pt.json
+++ b/src/lang/pt.json
@@ -9,6 +9,7 @@
   "station.settings.language.ja": "日本語",
   "station.settings.language.it": "Italiano",
   "station.settings.language.nl": "Nederlands",
+  "station.settings.language.ko": "한국어",
   "station.settings.altitude": "Altitude (m)",
   "station.settings.antenna": "Antena",
   "station.settings.button.save": "Salvar Configurações",
@@ -45,5 +46,12 @@
   "station.settings.useLocation": "📍 Usar Minha Localização Atual",
   "station.settings.useLocation.error1": "Não foi possível obter a localização. Por favor, insira manualmente.",
   "station.settings.useLocation.error2": "Geolocalização não é suportada pelo seu navegador.",
-  "station.settings.welcome": "👋 Bem-vindo ao OpenHamClock!"
+  "station.settings.welcome": "👋 Bem-vindo ao OpenHamClock!",
+  "plugins.layers.aurora.name": "Previsão de aurora",
+  "plugins.layers.aurora.description": "Previsão de probabilidade de aurora NOAA OVATION (30 min)",
+  "plugins.layers.earthquakes.name": "Terremotos",
+  "plugins.layers.earthquakes.description": "Dados sísmicos do USGS ao vivo (M2,5+ das últimas 24 horas)",
+  "plugins.layers.wxradar.name": "Radar meteorológico",
+  "plugins.layers.wxradar.description": "Sobreposição do radar meteorológico NEXRAD para a América do Norte",
+  "plugins.layers.wxradar.attribution": "Dados meteorológicos © Iowa State University Mesonet"
 }
diff --git a/src/plugins/layers/useAurora.js b/src/plugins/layers/useAurora.js
index 995d5a4..200bf1e 100644
--- a/src/plugins/layers/useAurora.js
+++ b/src/plugins/layers/useAurora.js
@@ -1,3 +1,5 @@
+import i18n from '../../lang/i18n';
+
 import { useState, useEffect, useRef } from 'react';
 
 // NOAA OVATION Aurora Forecast - JSON grid data
@@ -7,8 +9,8 @@ import { useState, useEffect, useRef } from 'react';
 
 export const metadata = {
   id: 'aurora',
-  name: 'Aurora Forecast',
-  description: 'NOAA OVATION aurora probability forecast (30-min)',
+  name: i18n.t('plugins.layers.aurora.name'),
+  description: i18n.t('plugins.layers.aurora.description'),
   icon: '🌌',
   category: 'space-weather',
   defaultEnabled: false,
diff --git a/src/plugins/layers/useEarthquakes.js b/src/plugins/layers/useEarthquakes.js
index 074babe..bdca710 100644
--- a/src/plugins/layers/useEarthquakes.js
+++ b/src/plugins/layers/useEarthquakes.js
@@ -1,3 +1,5 @@
+import i18n from '../../lang/i18n';
+
 import { useState, useEffect, useRef } from 'react';
 
 //Scaled markers - Bigger circles for stronger quakes
@@ -11,8 +13,8 @@ import { useState, useEffect, useRef } from 'react';
 
 export const metadata = {
   id: 'earthquakes',
-  name: 'Earthquakes',
-  description: 'Live USGS earthquake data (all earthquakes from last hour) with animated detection',
+  name: i18n.t('plugins.layers.earthquakes.name'),
+  description: i18n.t('plugins.layers.earthquakes.description'),
   icon: '🌋',
   category: 'geology',
   defaultEnabled: false,
diff --git a/src/plugins/layers/useWXRadar.js b/src/plugins/layers/useWXRadar.js
index 0282402..15692af 100644
--- a/src/plugins/layers/useWXRadar.js
+++ b/src/plugins/layers/useWXRadar.js
@@ -1,9 +1,11 @@
+import i18n from '../../lang/i18n';
+
 import { useState, useEffect } from 'react';
 
 export const metadata = {
   id: 'wxradar',
-  name: 'Weather Radar',
-  description: 'NEXRAD weather radar overlay for North America',
+  name: i18n.t('plugins.layers.wxradar.name'),
+  description: i18n.t('plugins.layers.wxradar.description'),
   icon: '☁️',
   category: 'weather',
   defaultEnabled: false,
@@ -21,7 +23,7 @@ export function useLayer({ enabled = false, opacity = 0.6, map = null }) {
       layers: 'nexrad-n0r-900913',
       format: 'image/png',
       transparent: true,
-      attribution: 'Weather data © Iowa State University Mesonet',
+      attribution: i18n.t('plugins.layers.wxradar.attribution'),
       opacity: opacity,
       zIndex: 200
     }
diff --git a/src/utils/callsign.js b/src/utils/callsign.js
index 2207fa2..64b829d 100644
--- a/src/utils/callsign.js
+++ b/src/utils/callsign.js
@@ -242,8 +242,7 @@ export const filterDXPaths = (paths, filters) => {
     // Exclude list - hide matching callsigns
     if (filters.excludeList?.length > 0) {
       const isExcluded = filters.excludeList.some(e =>
-        path.dxCall?.toUpperCase().includes(e.toUpperCase()) ||
-        path.spotter?.toUpperCase().includes(e.toUpperCase())
+        path.dxCall?.toUpperCase().startsWith(e.toUpperCase())
       );
       if (isExcluded) return false;
     }
diff --git a/src/utils/config.js b/src/utils/config.js
index 469ecd9..f95712d 100644
--- a/src/utils/config.js
+++ b/src/utils/config.js
@@ -10,7 +10,7 @@
 
 export const DEFAULT_CONFIG = {
   callsign: 'N0CALL',
-  callsignSize: 1.0, // Float multiplies base px size (0.1 to 2.0)
+  headerSize: 1.0, // Float multiplies base px size (0.1 to 2.0)
   locator: '',
   location: { lat: 40.0150, lon: -105.2705 }, // Boulder, CO (default)
   defaultDX: { lat: 35.6762, lon: 139.6503 }, // Tokyo
diff --git a/src/utils/geo.js b/src/utils/geo.js
index 8ce24e8..6e11edd 100644
--- a/src/utils/geo.js
+++ b/src/utils/geo.js
@@ -130,9 +130,9 @@ export const getMoonPosition = (date) => {
 export const getMoonPhase = (date) => {
   const JD = date.getTime() / 86400000 + 2440587.5;
   const T = (JD - 2451545.0) / 36525;
-  const D = (297.850 + 445267.1115 * T) % 360; // Mean elongation
-  // Phase angle (simplified)
-  const phase = ((D + 180) % 360) / 360;
+  const D = (297.850 + 445267.1115 * T) % 360; // Mean elongation: 0=new, 180=full
+  // Normalize to 0-1 range (0=new, 0.5=full)
+  const phase = (((D % 360) + 360) % 360) / 360;
   return phase;
 };