diff --git a/frontend/src/components/korea/AnalysisStatsPanel.tsx b/frontend/src/components/korea/AnalysisStatsPanel.tsx
index 63b1508..dd8b27f 100644
--- a/frontend/src/components/korea/AnalysisStatsPanel.tsx
+++ b/frontend/src/components/korea/AnalysisStatsPanel.tsx
@@ -82,8 +82,11 @@ export function AnalysisStatsPanel({ stats, lastUpdated, isLoading, analysisMap,
   const gearStats = useMemo(() => {
     const source = allShips ?? ships;
     const gearPattern = /^(.+?)_\d+_\d+_?$/;
+    const STALE_MS = 60 * 60_000; // 60분 이내만
+    const now = Date.now();
     const parentMap = new Map<string, number>();
     for (const s of source) {
+      if (now - s.lastSeen > STALE_MS) continue;
       const m = (s.name || '').match(gearPattern);
       if (m) {
         const parent = m[1].trim();
diff --git a/frontend/src/components/korea/FleetClusterLayer.tsx b/frontend/src/components/korea/FleetClusterLayer.tsx
index 2365f95..57fa7c2 100644
--- a/frontend/src/components/korea/FleetClusterLayer.tsx
+++ b/frontend/src/components/korea/FleetClusterLayer.tsx
@@ -127,6 +127,10 @@ export function FleetClusterLayer({ ships, analysisMap, clusters, onShipSelect,
   // 비허가 어구 클러스터: parentName → { parent: Ship | null, gears: Ship[] }
   const gearGroupMap = useMemo(() => {
     const gearPattern = /^(.+?)_\d+_\d+_?$/;
+    const MAX_DIST_DEG = 0.15; // ~10NM — 모선과 어구 간 최대 거리
+    const STALE_MS = 60 * 60_000; // 60분 이내 수신 신호만
+    const now = Date.now();
+
     const nameToShip = new Map<string, Ship>();
     for (const s of ships) {
       const nm = (s.name || '').trim();
@@ -134,12 +138,25 @@ export function FleetClusterLayer({ ships, analysisMap, clusters, onShipSelect,
         nameToShip.set(nm, s);
       }
     }
+
     const map = new Map<string, { parent: Ship | null; gears: Ship[] }>();
     for (const s of ships) {
+      // 60분 이내 수신 신호만
+      if (now - s.lastSeen > STALE_MS) continue;
+
       const m = (s.name || '').match(gearPattern);
       if (!m) continue;
       const parentName = m[1].trim();
-      const entry = map.get(parentName) ?? { parent: nameToShip.get(parentName) ?? null, gears: [] };
+      const parent = nameToShip.get(parentName) ?? null;
+
+      // 모선이 있으면 거리 제한 적용
+      if (parent) {
+        const dlat = Math.abs(s.lat - parent.lat);
+        const dlng = Math.abs(s.lng - parent.lng);
+        if (dlat > MAX_DIST_DEG || dlng > MAX_DIST_DEG) continue;
+      }
+
+      const entry = map.get(parentName) ?? { parent, gears: [] };
       entry.gears.push(s);
       map.set(parentName, entry);
     }