diff --git a/D03_PlanAnalysis/D03_PlanAnalysis_UI_SheetTiles.ts b/D03_PlanAnalysis/D03_PlanAnalysis_UI_SheetTiles.ts
index cd08c363d..2d20e522d 100644
--- a/D03_PlanAnalysis/D03_PlanAnalysis_UI_SheetTiles.ts
+++ b/D03_PlanAnalysis/D03_PlanAnalysis_UI_SheetTiles.ts
@@ -43,6 +43,8 @@ export interface SheetTiles {
     sheets: string[];
     cached: number;
     loading: boolean;
+    /** 마지막 보기 경위도 상자. */
+    bbox: string;
     failed: string[];
     /** 조각마다 받은 시간(ms · 마지막 20). */
     ms: Array<[string, number]>;
@@ -191,6 +193,7 @@ export function createSheetTiles(opts: {
       sheets: [...sheets],
       cached: cache.size,
       loading,
+      bbox: lastBox,
       failed: [...failed],
       ms: [...ms],
     }),