diff --git a/frontend/src/components/korea/FleetClusterLayer.tsx b/frontend/src/components/korea/FleetClusterLayer.tsx
index 4d3f3ec..e3f6690 100644
--- a/frontend/src/components/korea/FleetClusterLayer.tsx
+++ b/frontend/src/components/korea/FleetClusterLayer.tsx
@@ -74,9 +74,13 @@ export function FleetClusterLayer({ ships, analysisMap: analysisMapProp, onShipS
     const history = await fetchGroupHistory(groupKey, 12);
     const sorted = history.reverse();
     const filled = fillGapFrames(sorted);
-    useGearReplayStore.getState().loadHistory(
-      filled, correlationTracks, correlationData, enabledModels, enabledVessels,
-    );
+    const store = useGearReplayStore.getState();
+    store.loadHistory(filled, correlationTracks, correlationData, enabledModels, enabledVessels);
+    // correlation 데이터가 이미 로드된 경우 즉시 동기화
+    if (correlationData.length > 0 || correlationTracks.length > 0) {
+      store.updateCorrelation(correlationData, correlationTracks);
+    }
+    store.play();
   };
 
   const closeHistory = useCallback(() => {
@@ -97,12 +101,13 @@ export function FleetClusterLayer({ ships, analysisMap: analysisMapProp, onShipS
     useGearReplayStore.getState().setHoveredMmsi(hoveredTarget?.mmsi ?? null);
   }, [hoveredTarget]);
 
-  // ── correlation 데이터 → store 동기화 (비동기 로드 후 반영) ──
+  // ── correlation 데이터 → store 동기화 ──
+  // historyActive 의존: history 로드 후 이미 도착한 correlation 데이터 반영
   useEffect(() => {
-    if (correlationData.length > 0 || correlationTracks.length > 0) {
+    if (historyActive && (correlationData.length > 0 || correlationTracks.length > 0)) {
       useGearReplayStore.getState().updateCorrelation(correlationData, correlationTracks);
     }
-  }, [correlationData, correlationTracks]);
+  }, [correlationData, correlationTracks, historyActive]);
 
   // ── ESC 키 ──
   useEffect(() => {
diff --git a/frontend/src/hooks/useGearReplayLayers.ts b/frontend/src/hooks/useGearReplayLayers.ts
index c28b65b..fcf819c 100644
--- a/frontend/src/hooks/useGearReplayLayers.ts
+++ b/frontend/src/hooks/useGearReplayLayers.ts
@@ -69,6 +69,9 @@ export function useGearReplayLayers(
 
   // ── renderFrame ──────────────────────────────────────────────────────────
 
+  // 디버그 로그 (첫 프레임에서만 출력)
+  const debugLoggedRef = useRef(false);
+
   const renderFrame = useCallback(() => {
     if (historyFrames.length === 0) {
       replayLayerRef.current = [];
@@ -80,6 +83,22 @@ export function useGearReplayLayers(
     const ct = state.currentTime;
     const st = state.startTime;
 
+    // 디버그: 첫 프레임에서 데이터 상태 출력
+    if (!debugLoggedRef.current) {
+      debugLoggedRef.current = true;
+      console.log('[GearReplay] renderFrame 시작:', {
+        historyFrames: state.historyFrames.length,
+        correlationByModel: state.correlationByModel.size,
+        modelNames: [...state.correlationByModel.keys()],
+        correlationTripsData: correlationTripsData.length,
+        enabledModels: [...enabledModels],
+        enabledVessels: enabledVessels.size,
+      });
+      for (const [mn, items] of state.correlationByModel) {
+        console.log(`  [${mn}] ${items.length}건 (vessels: ${items.filter(c => c.targetType === 'VESSEL').length}, gear: ${items.filter(c => c.targetType !== 'VESSEL').length})`);
+      }
+    }
+
     // Find current frame
     const { index: frameIdx, cursor } = findFrameAtTime(state.frameTimes, ct, cursorRef.current);
     cursorRef.current = cursor;
@@ -449,6 +468,11 @@ export function useGearReplayLayers(
       }
     }
 
+    // 디버그: 연관 선박 렌더링 상태
+    if (corrPositions.length > 0 && !debugLoggedRef.current) {
+      console.log('[GearReplay] corrPositions:', corrPositions.length, 'operationalPolygons:', layers.filter(l => l.id?.toString().startsWith('replay-op-')).length);
+    }
+
     replayLayerRef.current = layers;
     requestRender();
   }, [
@@ -458,6 +482,14 @@ export function useGearReplayLayers(
     replayLayerRef, requestRender,
   ]);
 
+  // correlationByModel이 갱신되면 디버그 로그 리셋 (새 데이터 도착 확인)
+  useEffect(() => {
+    if (correlationByModel.size > 0) {
+      debugLoggedRef.current = false;
+      console.log('[GearReplay] correlationByModel 갱신:', correlationByModel.size, '모델', [...correlationByModel.keys()]);
+    }
+  }, [correlationByModel]);
+
   // ── zustand.subscribe effect (currentTime → renderFrame) ─────────────────
 
   useEffect(() => {
diff --git a/frontend/src/stores/gearReplayStore.ts b/frontend/src/stores/gearReplayStore.ts
index b91a8e9..b1e63c6 100644
--- a/frontend/src/stores/gearReplayStore.ts
+++ b/frontend/src/stores/gearReplayStore.ts
@@ -217,7 +217,10 @@ export const useGearReplayStore = create<GearReplayState>()(
 
       updateCorrelation: (corrData, corrTracks) => {
         const state = get();
-        if (state.historyFrames.length === 0) return;
+        if (state.historyFrames.length === 0) {
+          console.log('[GearReplayStore] updateCorrelation 스킵: historyFrames 비어있음');
+          return;
+        }
         const byModel = new Map<string, GearCorrelationItem[]>();
         for (const c of corrData) {
           const list = byModel.get(c.modelName) ?? [];
@@ -225,6 +228,12 @@ export const useGearReplayStore = create<GearReplayState>()(
           byModel.set(c.modelName, list);
         }
         const corrTrips = buildCorrelationTripsData(corrTracks, state.startTime);
+        console.log('[GearReplayStore] updateCorrelation:', {
+          corrData: corrData.length,
+          models: [...byModel.keys()],
+          corrTrips: corrTrips.length,
+          corrTracks: corrTracks.length,
+        });
         set({ correlationByModel: byModel, correlationTripsData: corrTrips });
       },