diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
index d9189a0..4bd3d2f 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
@@ -3986,7 +3986,7 @@ const locatorMarkers = new Map();
 const decodeContactPaths = new Map();
 let selectedMapQsoKey = null;
 const mapMarkers = new Set();
-const DEFAULT_MAP_SOURCE_FILTER = { ais: true, vdes: true, aprs: true, bookmark: false, ft8: true, wspr: true };
+const DEFAULT_MAP_SOURCE_FILTER = { ais: true, vdes: true, aprs: true, bookmark: false, ft8: true, ft4: true, wspr: true };
 const mapFilter = { ...DEFAULT_MAP_SOURCE_FILTER };
 const mapLocatorFilter = { phase: "band", bands: new Set() };
 let mapSearchFilter = "";
@@ -4163,7 +4163,7 @@ function ensureVdesMarker(key, entry) {
 }
 
 function ensureDecodeLocatorMarker(entry) {
-  if (!aprsMap || !entry || entry.marker || !entry.grid || (entry.sourceType !== "ft8" && entry.sourceType !== "wspr")) return;
+  if (!aprsMap || !entry || entry.marker || !entry.grid || (entry.sourceType !== "ft8" && entry.sourceType !== "ft4" && entry.sourceType !== "wspr")) return;
   const bounds = maidenheadToBounds(entry.grid);
   if (!bounds) return;
   const count = Math.max(entry.stationDetails?.size || 0, entry.stations?.size || 0, 1);
@@ -4245,7 +4245,7 @@ function pruneAisEntry(key, entry, cutoffMs) {
 
 function pruneLocatorEntry(key, entry, cutoffMs) {
   const canRenderMap = !!aprsMap && !decodeHistoryReplayActive;
-  if (!entry || (entry.sourceType !== "ft8" && entry.sourceType !== "wspr")) return true;
+  if (!entry || (entry.sourceType !== "ft8" && entry.sourceType !== "ft4" && entry.sourceType !== "wspr")) return true;
   if (!(entry.allStationDetails instanceof Map)) {
     entry.allStationDetails = entry.stationDetails instanceof Map
       ? new Map(entry.stationDetails)
@@ -4330,6 +4330,7 @@ function pruneMapHistory() {
 function locatorSourceLabel(type) {
   if (type === "bookmark") return "Bookmarks";
   if (type === "wspr") return "WSPR";
+  if (type === "ft4") return "FT4";
   return "FT8";
 }
 
@@ -4345,7 +4346,7 @@ function locatorFilterColor(type) {
   const light = lightTheme ? 42 : 56;
   const hue = type === "bookmark"
     ? hues.bookmark
-    : (type === "wspr" ? hues.wspr : hues.ft8);
+    : (type === "wspr" ? hues.wspr : (type === "ft4" ? hues.ft4 : hues.ft8));
   return `hsl(${hue.toFixed(1)} ${sat}% ${light}%)`;
 }
 
@@ -4470,6 +4471,7 @@ function locatorThemeHues() {
   return {
     bookmark: wrapHue(baseHue),
     ft8: wrapHue(peakHue),
+    ft4: wrapHue(peakHue + 30),
     wspr: wrapHue((waveHue + baseHue) / 2),
     bandBase: wrapHue((baseHue * 0.65) + (peakHue * 0.35)),
   };
@@ -4519,6 +4521,7 @@ function locatorHueForEntry(entry) {
   }
   if (entry?.sourceType === "bookmark") return hues.bookmark;
   if (entry?.sourceType === "wspr") return hues.wspr;
+  if (entry?.sourceType === "ft4") return hues.ft4;
   return hues.ft8;
 }
 
@@ -4785,7 +4788,7 @@ function setSelectedLocatorMarker(marker) {
 
 function isLocatorOverlay(marker) {
   const type = marker?.__trxType;
-  return type === "bookmark" || type === "ft8" || type === "wspr";
+  return type === "bookmark" || type === "ft8" || type === "ft4" || type === "wspr";
 }
 
 function sendLocatorOverlayToBack(marker) {
@@ -4916,7 +4919,7 @@ function rebuildMapLocatorFilters() {
   for (const entry of locatorMarkers.values()) {
     const sourceType = entry?.sourceType;
     if (!sourceType) continue;
-    if ((sourceType === "ft8" || sourceType === "wspr") && !entry?.visibleInHistoryWindow) continue;
+    if ((sourceType === "ft8" || sourceType === "ft4" || sourceType === "wspr") && !entry?.visibleInHistoryWindow) continue;
     availableSources.add(sourceType);
     const meta = entry?.bandMeta instanceof Map ? entry.bandMeta : new Map();
     for (const [label, hz] of meta.entries()) {
@@ -4944,7 +4947,7 @@ function rebuildMapLocatorFilters() {
     if (!bandMap.has(key)) mapLocatorFilter.bands.delete(key);
   }
 
-  const sourceItems = ["ais", "vdes", "aprs", "bookmark", "ft8", "wspr"]
+  const sourceItems = ["ais", "vdes", "aprs", "bookmark", "ft8", "ft4", "wspr"]
     .filter((key) => availableSources.has(key))
     .map((key) => ({
       key,
@@ -4986,7 +4989,7 @@ function markerPassesLocatorFilters(marker) {
 
 function markerSearchText(marker) {
   const type = marker?.__trxType;
-  if (type === "bookmark" || type === "ft8" || type === "wspr") {
+  if (type === "bookmark" || type === "ft8" || type === "ft4" || type === "wspr") {
     const entry = locatorEntryForMarker(marker);
     const parts = [];
     if (entry?.grid) parts.push(entry.grid);
@@ -5132,7 +5135,7 @@ window.clearMapMarkersByType = function(type) {
     return;
   }
 
-  if (type === "ft8" || type === "wspr") {
+  if (type === "ft8" || type === "ft4" || type === "wspr") {
     const prefix = `${type}:`;
     for (const [key, entry] of locatorMarkers.entries()) {
       if (!key.startsWith(prefix)) continue;
@@ -5379,7 +5382,7 @@ function initAprsMap() {
       return;
     }
 
-    if (marker.__trxType === "bookmark" || marker.__trxType === "ft8" || marker.__trxType === "wspr") {
+    if (marker.__trxType === "bookmark" || marker.__trxType === "ft8" || marker.__trxType === "ft4" || marker.__trxType === "wspr") {
       const center = locatorMarkerCenter(marker);
       if (center) {
         setSelectedLocatorMarker(marker);
@@ -5618,10 +5621,10 @@ window.navigateToMapLocator = function(grid, preferredType = null) {
   sizeAprsMapToViewport();
   if (!aprsMap) return false;
 
-  const pref = preferredType === "wspr" ? "wspr" : (preferredType === "ft8" ? "ft8" : null);
+  const pref = preferredType === "wspr" ? "wspr" : (preferredType === "ft4" ? "ft4" : (preferredType === "ft8" ? "ft8" : null));
   const keys = pref
-    ? [`${pref}:${normalizedGrid}`, `ft8:${normalizedGrid}`, `wspr:${normalizedGrid}`, `bookmark:${normalizedGrid}`]
-    : [`ft8:${normalizedGrid}`, `wspr:${normalizedGrid}`, `bookmark:${normalizedGrid}`];
+    ? [`${pref}:${normalizedGrid}`, `ft8:${normalizedGrid}`, `ft4:${normalizedGrid}`, `wspr:${normalizedGrid}`, `bookmark:${normalizedGrid}`]
+    : [`ft8:${normalizedGrid}`, `ft4:${normalizedGrid}`, `wspr:${normalizedGrid}`, `bookmark:${normalizedGrid}`];
   let entry = null;
   for (const key of keys) {
     entry = locatorMarkers.get(key);
@@ -6160,6 +6163,7 @@ function applyMapFilter() {
       (type === "vdes" && mapFilter.vdes) ||
       (type === "aprs" && mapFilter.aprs) ||
       (type === "ft8" && mapFilter.ft8) ||
+      (type === "ft4" && mapFilter.ft4) ||
       (type === "wspr" && mapFilter.wspr)
     );
     const onMap = aprsMap.hasLayer(marker);
@@ -6271,7 +6275,7 @@ function rebuildDecodeContactPaths() {
   const stationLocators = new Map();
   const directedMessages = [];
   for (const entry of locatorMarkers.values()) {
-    if (!entry || (entry.sourceType !== "ft8" && entry.sourceType !== "wspr")) continue;
+    if (!entry || (entry.sourceType !== "ft8" && entry.sourceType !== "ft4" && entry.sourceType !== "wspr")) continue;
     const grid = String(entry.grid || "").trim().toUpperCase();
     if (!grid || !(entry.stationDetails instanceof Map)) continue;
     for (const detail of entry.stationDetails.values()) {
@@ -6520,7 +6524,7 @@ window.syncBookmarkMapLocators = function(bookmarks) {
 
 window.ft8MapAddLocator = function(message, grids, type = "ft8", station = null, details = null) {
   if (!Array.isArray(grids) || grids.length === 0) return;
-  const markerType = type === "wspr" ? "wspr" : "ft8";
+  const markerType = type === "wspr" ? "wspr" : (type === "ft4" ? "ft4" : "ft8");
   const unique = [...new Set(grids.map((g) => String(g).toUpperCase()))];
   const stationId = station && String(station).trim() ? String(station).trim().toUpperCase() : "";
   const locatorDetails = new Map();
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/ft4.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/ft4.js
index 7890970..9cd97dd 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/ft4.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/ft4.js
@@ -132,7 +132,7 @@ window.onServerFt4Batch = function(messages) {
   for (const msg of messages) {
     const next = normalizeServerFt4Message(msg);
     if (next.grids.length > 0 && window.ft8MapAddLocator) {
-      window.ft8MapAddLocator(next.raw, next.grids, "ft8", next.station, { ...msg, freq_hz: next.rfHz, locator_details: next.locatorDetails });
+      window.ft8MapAddLocator(next.raw, next.grids, "ft4", next.station, { ...msg, freq_hz: next.rfHz, locator_details: next.locatorDetails });
     }
     next.history._tsMs = Number.isFinite(next.history?.ts_ms) ? Number(next.history.ts_ms) : Date.now();
     normalized.push(next.history);
@@ -183,7 +183,7 @@ window.onServerFt4 = function(msg) {
   if (ft4Status) ft4Status.textContent = ft4Paused ? "Paused" : "Receiving";
   const next = normalizeServerFt4Message(msg);
   if (next.grids.length > 0 && window.ft8MapAddLocator) {
-    window.ft8MapAddLocator(next.raw, next.grids, "ft8", next.station, { ...msg, freq_hz: next.rfHz, locator_details: next.locatorDetails });
+    window.ft8MapAddLocator(next.raw, next.grids, "ft4", next.station, { ...msg, freq_hz: next.rfHz, locator_details: next.locatorDetails });
   }
   addFt4Message(next.history);
 };