diff --git a/apps/sn/src/features/dredging/api/dredging-api.ts b/apps/sn/src/features/dredging/api/dredging-api.ts
index 60f8c2fe4..ea8293e97 100644
--- a/apps/sn/src/features/dredging/api/dredging-api.ts
+++ b/apps/sn/src/features/dredging/api/dredging-api.ts
@@ -1,3 +1,4 @@
+import { DREDGING_EXTERNAL_MODE } from "../model/disclosure";
 /** 준설 조회·등록·수정·삭제와 최근접 관로 HTTP 계약을 담당한다. */
 import {
   deleteData,
@@ -110,12 +111,13 @@ export const fetchDredgingRecords = async (params: {
 /** 등록된 준설사진의 공통 첨부파일 참조를 조회한다. */
 export const fetchDredgingPhotos = async (
   dredgingJobSn: string | number,
-  pipeFid: string,
+  pipeFid: string | null,
+  targetSn?: number,
 ): Promise<DredgingPhoto[]> => {
   if (!isDredgingBackendEnabled) return [];
   try {
     const body = await getRawJson(
-      `v1/dredging/records/${encodeURIComponent(dredgingJobSn)}/photos?fid=${encodeURIComponent(pipeFid)}`,
+      `v1/dredging/records/${encodeURIComponent(dredgingJobSn)}/photos?${targetSn ? `targetSn=${targetSn}` : `fid=${encodeURIComponent(pipeFid ?? "")}`}`,
     );
     return toDredgingPhotos(body);
   } catch (error) {
@@ -137,18 +139,18 @@ export const updateDredgingRecord = async (
   try {
     await putData(`v1/dredging/records/${encodeURIComponent(dredgingJobSn)}`, {
       dredgingDate: update.dredgingDate,
-      pipeFid: update.originalPipeFid,
+      targetSn: update.targetSn,
       registrationMode: update.registrationMode,
       location: {
         source: update.locationSource,
         longitude: update.location.longitude,
         latitude: update.location.latitude,
       },
-      expectedPipe: {
+      expectedPipe: update.pipe && !DREDGING_EXTERNAL_MODE ? {
         fid: update.pipe.fid,
         mngInstCd: update.pipe.mngInstCd,
         fcltMngNo: update.pipe.fcltMngNo,
-      },
+      } : null,
       retainedPhotoSns: update.retainedPhotoSns,
       newPhotos: update.newPhotos.map((photo) => {
         const attachment = attachments.get(photo.key);
@@ -242,7 +244,7 @@ const mockPipeForLocations = (locations: LocationRequest[]): PipeMatch => {
 export const findNearestPipeMatches = async (
   locations: LocationRequest[],
 ): Promise<Map<string, PipeMatch>> => {
-  if (locations.length === 0) return new Map();
+  if (DREDGING_EXTERNAL_MODE || locations.length === 0) return new Map();
 
   if (!isDredgingBackendEnabled) {
     const mockPipe = mockPipeForLocations(locations);
diff --git a/apps/sn/src/features/dredging/api/response-adapters.ts b/apps/sn/src/features/dredging/api/response-adapters.ts
index c3b23b48f..df9bbf4f2 100644
--- a/apps/sn/src/features/dredging/api/response-adapters.ts
+++ b/apps/sn/src/features/dredging/api/response-adapters.ts
@@ -55,7 +55,7 @@ export const toNearestPipeMatches = (body: any): Map<string, PipeMatch> => {
 
   for (const item of items ?? []) {
     if (!item.selected) {
-      failureMessages.push(nearestPipeFailureMessage(item));
+      if (item.failureCode !== "PIPE_NOT_FOUND") failureMessages.push(nearestPipeFailureMessage(item));
       continue;
     }
     matches.set(item.locationKey, {
diff --git a/apps/sn/src/features/dredging/model/disclosure.ts b/apps/sn/src/features/dredging/model/disclosure.ts
new file mode 100644
index 000000000..fa20becf3
--- /dev/null
+++ b/apps/sn/src/features/dredging/model/disclosure.ts
@@ -0,0 +1,2 @@
+/** 외부용 앱은 관망 정보를 요청하거나 화면에 표시하지 않는다. */
+export const DREDGING_EXTERNAL_MODE = false;
diff --git a/apps/sn/src/features/dredging/model/dredging-list-view.ts b/apps/sn/src/features/dredging/model/dredging-list-view.ts
index f75820b67..f2a7f45d7 100644
--- a/apps/sn/src/features/dredging/model/dredging-list-view.ts
+++ b/apps/sn/src/features/dredging/model/dredging-list-view.ts
@@ -1,3 +1,4 @@
+import { DREDGING_EXTERNAL_MODE } from "./disclosure";
 /** 준설 목록·집계 표의 컬럼·표시 변환. 서버 조회/React 상태와 분리한다. */
 import type { DredgingRecord } from "./types";
 import { MS_SWAGE_PPL_CODES } from "@/entities/facility/model/facility-code-fallbacks";
@@ -103,6 +104,8 @@ export const buildDredgingPopupParams = (record: DredgingRecord) => ({
   sourcePath: window.location.pathname,
   id: record.id,
   dredgingJobSn: record.dredgingJobSn,
+  targetSn: record.targetSn,
+  mappingStatus: record.mappingStatus,
   pipeFid: record.pipeFid,
   mngInstCd: record.mngInstCd,
   ctpv: record.ctpv,
@@ -140,7 +143,8 @@ export type TableHeadDefinition = {
   align?: "left" | "center" | "right";
 };
 
-export const municipalityHeadlist: TableHeadDefinition[] = [
+const fullMunicipalityHeadlist: TableHeadDefinition[] = [
+  { id: "mappingStatusLabel", title: "관로 지정" },
   { id: "rowNumber", title: "순번" },
   { id: "ctpv", title: "시도" },
   { id: "sgg", title: "시군구" },
@@ -156,6 +160,10 @@ export const municipalityHeadlist: TableHeadDefinition[] = [
   { id: "registeredDate", title: "등록일자" },
 ];
 
+export const municipalityHeadlist = DREDGING_EXTERNAL_MODE
+  ? fullMunicipalityHeadlist.filter(column => ["rowNumber", "ctpv", "sgg", "dredgingDate", "photoCount", "registeredDate"].includes(column.id))
+  : fullMunicipalityHeadlist;
+
 export const diameterHeadlist: TableHeadDefinition[] = [
   { id: "ctpv", title: "시도" },
   { id: "totalLengthKm", title: "관로연장(km)", align: "right" },
@@ -202,33 +210,33 @@ export const buildDiameterRows = (records: DredgingRecord[]): TableRow[] =>
       roundKm(
         items
           .filter(predicate)
-          .reduce((sum, record) => sum + record.pipeLengthM, 0),
+          .reduce((sum, record) => sum + (record.pipeLengthM ?? 0), 0),
       );
 
     return {
       ctpv,
       totalLengthKm: roundKm(
-        items.reduce((sum, record) => sum + record.pipeLengthM, 0),
+        items.reduce((sum, record) => sum + (record.pipeLengthM ?? 0), 0),
       ),
-      diameter450: sumLength((record) => record.pipeDiameterMm <= 450),
+      diameter450: sumLength((record) => (record.pipeDiameterMm ?? 0) <= 450),
       diameter600: sumLength(
-        (record) => record.pipeDiameterMm > 450 && record.pipeDiameterMm <= 600,
+        (record) => (record.pipeDiameterMm ?? 0) > 450 && (record.pipeDiameterMm ?? 0) <= 600,
       ),
       diameter700: sumLength(
-        (record) => record.pipeDiameterMm > 600 && record.pipeDiameterMm <= 700,
+        (record) => (record.pipeDiameterMm ?? 0) > 600 && (record.pipeDiameterMm ?? 0) <= 700,
       ),
       diameter900: sumLength(
-        (record) => record.pipeDiameterMm > 700 && record.pipeDiameterMm <= 900,
+        (record) => (record.pipeDiameterMm ?? 0) > 700 && (record.pipeDiameterMm ?? 0) <= 900,
       ),
       diameter1000: sumLength(
         (record) =>
-          record.pipeDiameterMm > 900 && record.pipeDiameterMm <= 1000,
+          (record.pipeDiameterMm ?? 0) > 900 && (record.pipeDiameterMm ?? 0) <= 1000,
       ),
       diameter1200: sumLength(
         (record) =>
-          record.pipeDiameterMm > 1000 && record.pipeDiameterMm <= 1200,
+          (record.pipeDiameterMm ?? 0) > 1000 && (record.pipeDiameterMm ?? 0) <= 1200,
       ),
-      diameter1500: sumLength((record) => record.pipeDiameterMm >= 1500),
+      diameter1500: sumLength((record) => (record.pipeDiameterMm ?? 0) >= 1500),
       recordIds: items.map((record) => record.id),
     };
   });
@@ -239,7 +247,7 @@ export const buildElapsedYearRows = (records: DredgingRecord[]): TableRow[] =>
       roundKm(
         items
           .filter(predicate)
-          .reduce((sum, record) => sum + record.pipeLengthM, 0),
+          .reduce((sum, record) => sum + (record.pipeLengthM ?? 0), 0),
       );
     const elapsedYears = (record: DredgingRecord) =>
       record.installationYear === null
@@ -249,7 +257,7 @@ export const buildElapsedYearRows = (records: DredgingRecord[]): TableRow[] =>
     return {
       ctpv,
       totalLengthKm: roundKm(
-        items.reduce((sum, record) => sum + record.pipeLengthM, 0),
+        items.reduce((sum, record) => sum + (record.pipeLengthM ?? 0), 0),
       ),
       under10: sumLength((record) => {
         const elapsed = elapsedYears(record);
diff --git a/apps/sn/src/features/dredging/model/registration-request.ts b/apps/sn/src/features/dredging/model/registration-request.ts
index b24813293..fbb906e09 100644
--- a/apps/sn/src/features/dredging/model/registration-request.ts
+++ b/apps/sn/src/features/dredging/model/registration-request.ts
@@ -19,11 +19,11 @@ const buildRegistrationBody = (
       longitude: group.location.longitude,
       latitude: group.location.latitude,
     },
-    expectedPipe: {
+    expectedPipe: group.pipe ? {
       fid: group.pipe.fid,
       mngInstCd: group.pipe.mngInstCd,
       fcltMngNo: group.pipe.fcltMngNo,
-    },
+    } : null,
     photos: group.photos.map((photo) => {
       const attachment = attachments.get(photo.key);
       if (!attachment && requireAttachments) {
diff --git a/apps/sn/src/features/dredging/model/types.ts b/apps/sn/src/features/dredging/model/types.ts
index 8fbe9d815..fedc48178 100644
--- a/apps/sn/src/features/dredging/model/types.ts
+++ b/apps/sn/src/features/dredging/model/types.ts
@@ -59,32 +59,35 @@ export type DredgingDraftGroup = {
 export type DredgingRecord = {
   id: string;
   dredgingJobSn: number | string;
-  pipeFid: string;
-  mngInstCd: string;
+  targetSn?: number;
+  mappingStatus?: "AUTO" | "UNMAPPED";
+  pipeFid: string | null;
+  mngInstCd: string | null;
   ctpv: string;
   sgg: string;
-  treatmentZone: string;
-  fcltMngNo: string;
-  pipeDiameterMm: number;
-  pipeLengthM: number;
-  pipeMaterial: string;
+  treatmentZone: string | null;
+  fcltMngNo: string | null;
+  pipeDiameterMm: number | null;
+  pipeLengthM: number | null;
+  pipeMaterial: string | null;
   installationYear: number | null;
   dredgingDate: string;
   photoCount: number;
   registeredDate: string;
   longitude: number;
   latitude: number;
-  snappedLongitude: number;
-  snappedLatitude: number;
+  snappedLongitude: number | null;
+  snappedLatitude: number | null;
   registrationMode: DredgingRegistrationMode;
   registrationSource: DredgingLocationSource;
-  matchDistanceMeters: number;
+  matchDistanceMeters: number | null;
   isMock: boolean;
 };
 
 export type DredgingPhoto = {
+  targetSn?: number;
   photoSn: number;
-  pipeFid: string;
+  pipeFid?: string | null;
   atflCd: string;
   atflId: string;
   originalFileName: string;
@@ -97,18 +100,19 @@ export type DredgingSaveGroup = {
   dredgingDate: string;
   location: GeoPoint;
   locationSource: DredgingLocationSource;
-  pipe: PipeMatch;
+  pipe: PipeMatch | null;
   photos: DredgingPhotoDraft[];
 };
 
 /** 상세 기반 수정 팝업에서 선택한 한 관로의 위치·사진을 함께 갱신한다. */
 export type DredgingRecordUpdate = {
   dredgingDate: string;
-  originalPipeFid: string;
+  originalPipeFid: string | null;
+  targetSn: number;
   registrationMode: DredgingRegistrationMode;
   location: GeoPoint;
   locationSource: DredgingLocationSource;
-  pipe: PipeMatch;
+  pipe: PipeMatch | null;
   retainedPhotoSns: number[];
   newPhotos: DredgingPhotoDraft[];
 };
diff --git a/apps/sn/src/features/dredging/ui/dredging-detail-popup-page.tsx b/apps/sn/src/features/dredging/ui/dredging-detail-popup-page.tsx
index 5223ffcb8..9bad04c3a 100644
--- a/apps/sn/src/features/dredging/ui/dredging-detail-popup-page.tsx
+++ b/apps/sn/src/features/dredging/ui/dredging-detail-popup-page.tsx
@@ -1,4 +1,5 @@
 "use client";
+import { DREDGING_EXTERNAL_MODE } from "../model/disclosure";
 
 import dynamic from "next/dynamic";
 import { useConfirm } from "@frontend-opensource/use-react-hooks";
@@ -134,25 +135,25 @@ const DredgingDetailPopupPage = ({
   const [statusMessage, setStatusMessage] = useState("");
   const uploadedAttachmentsRef = useRef(new Map<string, AttachmentReference>());
 
-  const initialMatchedPipe = useMemo<PipeMatch>(
-    () => ({
+  const initialMatchedPipe = useMemo<PipeMatch | null>(
+    () => !record.pipeFid || DREDGING_EXTERNAL_MODE ? null : ({
       fid: record.pipeFid,
-      mngInstCd: record.mngInstCd,
-      fcltMngNo: record.fcltMngNo,
-      pipeDiameterMm: record.pipeDiameterMm,
-      pipeLengthM: record.pipeLengthM,
-      pipeMaterial: record.pipeMaterial,
+      mngInstCd: record.mngInstCd ?? "",
+      fcltMngNo: record.fcltMngNo ?? "",
+      pipeDiameterMm: record.pipeDiameterMm ?? 0,
+      pipeLengthM: record.pipeLengthM ?? 0,
+      pipeMaterial: record.pipeMaterial ?? "",
       installationYear: record.installationYear,
       swtrmtZoneFid: null,
-      swtrmtZoneNm: record.treatmentZone,
-      distanceMeters: record.matchDistanceMeters,
+      swtrmtZoneNm: record.treatmentZone ?? "",
+      distanceMeters: record.matchDistanceMeters ?? 0,
       snappedLongitude: record.snappedLongitude || record.longitude,
       snappedLatitude: record.snappedLatitude || record.latitude,
       isMock: record.isMock,
     }),
     [record],
   );
-  const [matchedPipe, setMatchedPipe] = useState<PipeMatch>(initialMatchedPipe);
+  const [matchedPipe, setMatchedPipe] = useState<PipeMatch | null>(initialMatchedPipe);
 
   useEffect(() => {
     let cancelled = false;
@@ -168,6 +169,7 @@ const DredgingDetailPopupPage = ({
         const items = await fetchDredgingPhotos(
           record.dredgingJobSn,
           record.pipeFid,
+          record.targetSn,
         );
         const previews = await Promise.all(
           items.map(async (photo): Promise<DredgingPhotoPreview> => {
@@ -214,7 +216,7 @@ const DredgingDetailPopupPage = ({
       cancelled = true;
       createdUrls.forEach((url) => URL.revokeObjectURL(url));
     };
-  }, [record.dredgingJobSn, record.pipeFid]);
+  }, [record.dredgingJobSn, record.pipeFid, record.targetSn]);
 
   useEffect(
     () => () => {
@@ -258,19 +260,22 @@ const DredgingDetailPopupPage = ({
     }
   };
 
-  const pipeInfo = [
+  const pipeInfo = DREDGING_EXTERNAL_MODE ? [
+    ["시도", record.ctpv || "확인불가"], ["시군구", record.sgg || "확인불가"],
+    ["위치등록", locationSourceLabels[locationSource] || locationSource],
+  ] : [
     ["시도", record.ctpv || "확인불가"],
     ["시군구", record.sgg || "확인불가"],
     [
       "처리구역",
-      matchedPipe.swtrmtZoneNm || record.treatmentZone || "확인불가",
+      matchedPipe?.swtrmtZoneNm || record.treatmentZone || "확인불가",
     ],
-    ["관경", `${matchedPipe.pipeDiameterMm.toLocaleString()} mm`],
-    ["관로연장", `${matchedPipe.pipeLengthM.toLocaleString()} m`],
-    ["관재질", resolvePipeMaterialName(matchedPipe.pipeMaterial)],
+    ["관경", matchedPipe ? `${matchedPipe.pipeDiameterMm.toLocaleString()} mm` : "미산정"],
+    ["관로연장", matchedPipe ? `${matchedPipe.pipeLengthM.toLocaleString()} m` : "미산정"],
+    ["관재질", matchedPipe ? resolvePipeMaterialName(matchedPipe.pipeMaterial) : "미확인"],
     [
       "매설년도",
-      matchedPipe.installationYear
+      matchedPipe?.installationYear
         ? `${matchedPipe.installationYear}년`
         : "확인불가",
     ],
@@ -280,7 +285,7 @@ const DredgingDetailPopupPage = ({
     { length: Math.ceil(pipeInfo.length / 2) },
     (_, index) => pipeInfo.slice(index * 2, index * 2 + 2),
   );
-  const automaticMappingValue = `${matchedPipe.distanceMeters.toFixed(2)} m`;
+  const automaticMappingValue = DREDGING_EXTERNAL_MODE ? "위치 등록" : matchedPipe ? `${matchedPipe.distanceMeters.toFixed(2)} m` : "관로 미지정";
   const totalPhotoCount = photos.length + newPhotos.length;
 
   const handleNewFiles = async (files: File[] | null) => {
@@ -407,17 +412,12 @@ const DredgingDetailPopupPage = ({
         { locationKey, ...locationDraft },
       ]);
       const nextPipe = matches.get(locationKey);
-      if (!nextPipe) {
-        throw new Error(
-          "50m 이내에 관로가 없습니다. 지도에서 준설위치를 다시 확인해주세요.",
-        );
-      }
       setLocation(locationDraft);
       setLocationSource("MANUAL");
-      setMatchedPipe(nextPipe);
+      setMatchedPipe(nextPipe ?? null);
       setLocationDraft(null);
       setIsEditingLocation(false);
-      setStatusMessage("변경한 위치와 최근접 관로를 확인했습니다.");
+      setStatusMessage(DREDGING_EXTERNAL_MODE ? "변경한 준설위치를 적용했습니다." : nextPipe ? "변경한 위치와 최근접 관로를 확인했습니다." : "관로 미지정으로 저장할 수 있습니다.");
     } catch (matchFailure) {
       setMatchError(
         matchFailure instanceof Error
@@ -449,6 +449,8 @@ const DredgingDetailPopupPage = ({
       alert("선택한 지도 위치를 먼저 적용해주세요.");
       return;
     }
+    if (!record.targetSn) { alert("화면을 새로고침해 준설대상번호를 확인해주세요."); return; }
+    if (!DREDGING_EXTERNAL_MODE && !matchedPipe && !(await confirm("관로 미지정 상태로 수정 내용을 저장하시겠습니까?"))) return;
     setIsSaving(true);
     try {
       setStatusMessage(
@@ -466,6 +468,7 @@ const DredgingDetailPopupPage = ({
         {
           dredgingDate,
           originalPipeFid: record.pipeFid,
+          targetSn: record.targetSn,
           registrationMode,
           location,
           locationSource:
@@ -524,9 +527,9 @@ const DredgingDetailPopupPage = ({
         <aside className="flex min-h-0 min-w-0 flex-col gap-3 overflow-y-auto overscroll-contain pr-1 [scrollbar-gutter:stable]">
           <section className="card card-border !m-0 shrink-0 overflow-hidden !p-0">
             <div className="card-header !m-0">
-              <h2 className="text-2xl font-medium text-label">관로 정보</h2>
+              <h2 className="text-2xl font-medium text-label">{DREDGING_EXTERNAL_MODE ? "준설 정보" : "관로 정보"}</h2>
               <span className="truncate text-base text-muted-foreground">
-                관로번호 {matchedPipe.fcltMngNo || "확인불가"}
+                {DREDGING_EXTERNAL_MODE ? `준설대상 ${record.targetSn ?? ""}` : `관로번호 ${matchedPipe?.fcltMngNo || "관로 미지정"}`}
               </span>
             </div>
             <div className="p-3">
@@ -558,7 +561,7 @@ const DredgingDetailPopupPage = ({
                         dredgingDate
                       )}
                     </TableCell>
-                    <TableHead>자동매핑</TableHead>
+                    <TableHead>{DREDGING_EXTERNAL_MODE ? "위치" : "자동매핑"}</TableHead>
                     <TableCell
                       className="truncate border px-4"
                       title={automaticMappingValue}
@@ -838,13 +841,13 @@ const DredgingDetailPopupPage = ({
               <div className="card-header !m-0 flex-wrap gap-x-2 gap-y-1 !border-b-0">
                 <div className="min-w-0">
                   <h2 className="text-2xl font-medium text-label">
-                    위치 및 관로
+                    {DREDGING_EXTERNAL_MODE ? "준설 위치" : "위치 및 관로"}
                   </h2>
                   <p
                     className={`mt-1 truncate text-sm ${matchError ? "text-rose-700" : "text-muted-foreground"}`}
                   >
-                    자동 연결 관로 · {matchedPipe.fcltMngNo} ·{" "}
-                    {matchError ?? `${matchedPipe.distanceMeters.toFixed(2)}m`}
+                    {DREDGING_EXTERNAL_MODE ? "배경지도에서 실제 준설 위치를 지정해주세요." :
+                      matchError ?? (matchedPipe ? `자동 연결 관로 · ${matchedPipe.fcltMngNo} · ${matchedPipe.distanceMeters.toFixed(2)}m` : "관로 미지정")}
                   </p>
                 </div>
                 <div className="flex shrink-0 gap-2">
@@ -883,7 +886,7 @@ const DredgingDetailPopupPage = ({
                   data-testid="dredging-edit-status"
                 >
                   {statusMessage ||
-                    "준설일자·사진·위치와 자동 연결 관로를 확인해주세요."}
+                    (DREDGING_EXTERNAL_MODE ? "준설일자·사진·위치를 확인해주세요." : "준설일자·사진·위치와 자동 연결 관로를 확인해주세요.")}
                 </p>
               </div>
             </section>
@@ -914,8 +917,8 @@ const DredgingDetailPopupPage = ({
                 isEditingLocation
                   ? "지도에서 변경할 준설위치를 클릭한 뒤 선택 위치 적용을 눌러주세요."
                   : editable
-                    ? "현재 준설위치와 자동 연결된 관로를 표시하고 있습니다."
-                    : "준설위치와 자동 연결된 관로를 표시하고 있습니다."
+                    ? (DREDGING_EXTERNAL_MODE ? "현재 준설위치를 표시하고 있습니다." : "현재 준설위치와 자동 연결된 관로를 표시하고 있습니다.")
+                    : (DREDGING_EXTERNAL_MODE ? "준설위치를 표시하고 있습니다." : "준설위치와 자동 연결된 관로를 표시하고 있습니다.")
               }
               height="h-full min-h-0"
             />
diff --git a/apps/sn/src/features/dredging/ui/dredging-list-page.tsx b/apps/sn/src/features/dredging/ui/dredging-list-page.tsx
index 7b9c795a6..a4fddb007 100644
--- a/apps/sn/src/features/dredging/ui/dredging-list-page.tsx
+++ b/apps/sn/src/features/dredging/ui/dredging-list-page.tsx
@@ -6,6 +6,7 @@
  * - 지자체별/관경별/경과년도별 조회와 XLSX 다운로드 제공
  */
 "use client";
+import { DREDGING_EXTERNAL_MODE } from "../model/disclosure";
 import { useFacilityCodeCatalog } from "@/entities/facility/lib/use-facility-code-catalog";
 import { useDredgingListData } from "../lib/use-dredging-list-data";
 import {
@@ -187,8 +188,8 @@ const Page = () => {
     return filteredRecords.map((record, index) => ({
       rowNumber: index + 1,
       ...record,
-      pipeLengthM: Number(record.pipeLengthM.toFixed(2)),
-      pipeMaterial: resolvePipeMaterialName(record.pipeMaterial, materialNames),
+      pipeLengthM: Number((record.pipeLengthM ?? 0).toFixed(2)),
+      pipeMaterial: resolvePipeMaterialName(record.pipeMaterial ?? "", materialNames),
       installationYear: record.installationYear ?? "확인불가",
       elapsedYears:
         record.installationYear === null
@@ -372,27 +373,28 @@ const Page = () => {
       const addedRecords = savedGroups.map<DredgingRecord>((group, index) => ({
         id: `${localJobSn}-${index + 1}`,
         dredgingJobSn: localJobSn,
-        pipeFid: group.pipe.fid,
-        mngInstCd: group.pipe.mngInstCd,
+        targetSn: index + 1,
+        pipeFid: group.pipe?.fid ?? null,
+        mngInstCd: group.pipe?.mngInstCd ?? null,
         ctpv: ctpvName || "경기도",
         sgg: sggName || "양평군",
-        treatmentZone: group.pipe.swtrmtZoneNm || "확인불가",
-        fcltMngNo: group.pipe.fcltMngNo,
-        pipeDiameterMm: group.pipe.pipeDiameterMm,
-        pipeLengthM: group.pipe.pipeLengthM,
-        pipeMaterial: group.pipe.pipeMaterial,
-        installationYear: group.pipe.installationYear,
+        treatmentZone: group.pipe?.swtrmtZoneNm || "확인불가",
+        fcltMngNo: group.pipe?.fcltMngNo ?? null,
+        pipeDiameterMm: group.pipe?.pipeDiameterMm ?? null,
+        pipeLengthM: group.pipe?.pipeLengthM ?? null,
+        pipeMaterial: group.pipe?.pipeMaterial ?? null,
+        installationYear: group.pipe?.installationYear ?? null,
         dredgingDate: group.dredgingDate,
         photoCount: group.photos.length,
         registeredDate,
         longitude: group.location.longitude,
         latitude: group.location.latitude,
-        snappedLongitude: group.pipe.snappedLongitude,
-        snappedLatitude: group.pipe.snappedLatitude,
+        snappedLongitude: group.pipe?.snappedLongitude ?? null,
+        snappedLatitude: group.pipe?.snappedLatitude ?? null,
         registrationMode: group.registrationMode,
         registrationSource: group.locationSource,
-        matchDistanceMeters: group.pipe.distanceMeters,
-        isMock: group.pipe.isMock || !isDredgingBackendEnabled,
+        matchDistanceMeters: group.pipe?.distanceMeters ?? null,
+        isMock: Boolean(group.pipe?.isMock) || !isDredgingBackendEnabled,
       }));
       prependDemoRecords(addedRecords);
       setCurrentPage(1);
@@ -536,8 +538,8 @@ const Page = () => {
                 </SelectTrigger>
                 <SelectContent>
                   <SelectItem value="MUNICIPALITY">지자체별</SelectItem>
-                  <SelectItem value="DIAMETER">관경별</SelectItem>
-                  <SelectItem value="ELAPSED_YEAR">경과년도별</SelectItem>
+                  {!DREDGING_EXTERNAL_MODE && (<SelectItem value="DIAMETER">관경별</SelectItem>)}
+                  {!DREDGING_EXTERNAL_MODE && (<SelectItem value="ELAPSED_YEAR">경과년도별</SelectItem>)}
                 </SelectContent>
               </Select>
             </div>
diff --git a/apps/sn/src/features/dredging/ui/dredging-location-map.tsx b/apps/sn/src/features/dredging/ui/dredging-location-map.tsx
index 3473d513d..f3c4a377b 100644
--- a/apps/sn/src/features/dredging/ui/dredging-location-map.tsx
+++ b/apps/sn/src/features/dredging/ui/dredging-location-map.tsx
@@ -1,4 +1,5 @@
 "use client";
+import { DREDGING_EXTERNAL_MODE } from "../model/disclosure";
 
 import Feature from "ol/Feature.js";
 import type { FeatureLike } from "ol/Feature.js";
@@ -265,6 +266,12 @@ const LocationInteraction = ({
     previousValueRef.current = value;
   }, [gisMap, interactive, value?.latitude, value?.longitude]);
 
+  if (DREDGING_EXTERNAL_MODE) {
+    return <div className="rounded-sm border border-border bg-background px-2 py-1.5 text-xs text-label shadow">
+      {interactive ? "지도를 클릭해 준설위치를 선택하세요." : "등록된 준설위치를 확인합니다."}
+    </div>;
+  }
+
   const pipeStatusText = (() => {
     if (pipeLayerSettings.length === 0)
       return "관망도 레이어 설정을 불러오는 중입니다.";
@@ -329,6 +336,7 @@ const DredgingLocationMap = ({
   );
 
   useEffect(() => {
+    if (DREDGING_EXTERNAL_MODE) return; // 외부에서는 관망 레이어 설정과 도형을 요청하지 않는다.
     let cancelled = false;
     const load = async () => {
       try {
@@ -370,8 +378,8 @@ const DredgingLocationMap = ({
             value={value}
             onChange={onChange}
             interactive={interactive}
-            matchedPipe={matchedPipe}
-            pipeLayerSettings={pipeLayerSettings}
+            matchedPipe={DREDGING_EXTERNAL_MODE ? null : matchedPipe}
+            pipeLayerSettings={DREDGING_EXTERNAL_MODE ? [] : pipeLayerSettings}
           />
         }
         defaultZoom={value ? 17 : 7.5}
diff --git a/apps/sn/src/features/dredging/ui/dredging-register-modal.tsx b/apps/sn/src/features/dredging/ui/dredging-register-modal.tsx
index 34146bdb9..da2b96a96 100644
--- a/apps/sn/src/features/dredging/ui/dredging-register-modal.tsx
+++ b/apps/sn/src/features/dredging/ui/dredging-register-modal.tsx
@@ -1,8 +1,10 @@
+"use client";
+import { DREDGING_EXTERNAL_MODE } from "../model/disclosure";
 /**
  * 화면명: 준설실적 등록
  * 준설 사진을 등록하고 촬영정보·위치·인접 관로를 확인하여 준설실적을 저장하는 화면이다.
  */
-"use client";
+
 
 import dynamic from "next/dynamic";
 import { useConfirm } from "@frontend-opensource/use-react-hooks";
@@ -196,7 +198,9 @@ const DredgingRegisterModal = ({
     try {
       const matches = await findNearestPipeMatches(locations);
       if (matches.size !== locations.length) {
-        throw new Error("탐색거리 안에서 관로를 찾지 못한 위치가 있습니다.");
+        commitGroups(current => current.map(item => item.id === group.id
+          ? { ...item, matchedPipe: null, isMatching: false, matchError: DREDGING_EXTERNAL_MODE ? null : "관로 미지정으로 저장할 수 있습니다." } : item));
+        return;
       }
 
       const matchedPipes = Array.from(matches.values());
@@ -453,18 +457,15 @@ const DredgingRegisterModal = ({
       if (!location) {
         throw new Error(`${label}: 지도에서 준설위치를 등록해주세요.`);
       }
-      if (!group.matchedPipe) {
-        throw new Error(
-          `${label}: ${group.matchError ?? "최근접 관로 자동 매핑을 완료해주세요."}`,
-        );
-      }
+      if (group.matchError?.startsWith("사진 위치가 서로 다른 관로")) throw new Error(group.matchError);
+      if (group.isMatching) throw new Error(`${label}: 위치 확인이 끝난 뒤 저장해주세요.`);
       saveGroups.push({
         localId: group.id,
         registrationMode: group.registrationMode,
         dredgingDate: representativeDredgingDate,
         location,
         locationSource: group.manualLocation ? "MANUAL" : "EXIF",
-        pipe: group.matchedPipe,
+        pipe: DREDGING_EXTERNAL_MODE ? null : group.matchedPipe,
         photos: group.photos,
       });
     }
@@ -476,6 +477,8 @@ const DredgingRegisterModal = ({
     if (savingRef.current) return;
     try {
       const saveGroups = validateAndBuildSaveGroups();
+      if (!DREDGING_EXTERNAL_MODE && saveGroups.some(group => !group.pipe)
+          && !(await confirm("관로가 지정되지 않은 대상이 있습니다. 사진과 위치를 저장하시겠습니까?"))) return;
       savingRef.current = true;
       setIsSaving(true);
       setStatusMessage(
@@ -491,7 +494,7 @@ const DredgingRegisterModal = ({
       uploadedAttachmentsRef.current = attachments;
       setStatusMessage(
         isDredgingBackendEnabled
-          ? "준설 결과와 관로 매핑을 저장하고 있습니다."
+          ? (DREDGING_EXTERNAL_MODE ? "준설 결과를 저장하고 있습니다." : "준설 결과와 관로 매핑을 저장하고 있습니다.")
           : "준설 결과 등록을 완료했습니다.",
       );
       const session =
diff --git a/apps/sn/src/features/dredging/ui/dredging-registration-body.tsx b/apps/sn/src/features/dredging/ui/dredging-registration-body.tsx
index 4a2c93b2d..fa6956697 100644
--- a/apps/sn/src/features/dredging/ui/dredging-registration-body.tsx
+++ b/apps/sn/src/features/dredging/ui/dredging-registration-body.tsx
@@ -1,4 +1,6 @@
 "use client";
+
+import { DREDGING_EXTERNAL_MODE } from "../model/disclosure";
 import type { ComponentType } from "react";
 import { FileUpload } from "@common/business_components/ui/file-upload";
 import {
@@ -96,7 +98,7 @@ export const DredgingRegistrationBody = ({
   >
     <div className="bg-secondary/40 mb-3 flex shrink-0 flex-wrap items-center gap-x-4 gap-y-1 rounded-sm border border-border px-4 py-2 text-sm text-label">
       <strong className="text-foreground">등록 안내</strong>
-      <span>관로별 사진은 최대 5장까지 등록할 수 있습니다.</span>
+      <span>{DREDGING_EXTERNAL_MODE ? "등록 건별" : "관로별"} 사진은 최대 5장까지 등록할 수 있습니다.</span>
       <span>
         모든 등록 건은 하나의 준설작업이며 동일한 준설일자를 사용합니다.
       </span>
@@ -114,7 +116,7 @@ export const DredgingRegistrationBody = ({
             <div className="card-header !m-0">
               <h3 className="text-2xl font-medium text-label">등록 정보</h3>
               <Button type="button" size="sm" onClick={addGroup}>
-                관로 추가
+                {DREDGING_EXTERNAL_MODE ? "등록 건 추가" : "관로 추가"}
               </Button>
             </div>
             <div className="p-3">
@@ -151,7 +153,7 @@ export const DredgingRegistrationBody = ({
                     </TableCell>
                   </TableRow>
                   <TableRow>
-                    <TableHead>등록 관로</TableHead>
+                    <TableHead>{DREDGING_EXTERNAL_MODE ? "등록 대상" : "등록 관로"}</TableHead>
                     <TableCell className="border px-4">
                       <div
                         className="flex flex-wrap items-center gap-2"
@@ -379,7 +381,7 @@ export const DredgingRegistrationBody = ({
 
           <section className="card card-border !m-0 shrink-0 overflow-hidden !p-0">
             <div className="card-header !m-0 flex-wrap gap-2">
-              <h3 className="text-2xl font-medium text-label">위치 및 관로</h3>
+              <h3 className="text-2xl font-medium text-label">{DREDGING_EXTERNAL_MODE ? "준설 위치" : "위치 및 관로"}</h3>
               <div className="flex shrink-0 flex-wrap justify-end gap-1">
                 {isEditingActiveLocation ? (
                   <>
@@ -446,8 +448,9 @@ export const DredgingRegistrationBody = ({
                       </span>
                     </TableCell>
                   </TableRow>
+                  {!DREDGING_EXTERNAL_MODE && (
                   <TableRow>
-                    <TableHead data-required>자동 연결 관로</TableHead>
+                    <TableHead>자동 연결 관로</TableHead>
                     <TableCell className="border px-4">
                       <strong className="mr-3 text-foreground">
                         {activeGroup.isMatching
@@ -473,7 +476,7 @@ export const DredgingRegistrationBody = ({
                               "위치를 지정하면 50m 이내 최근접 관로를 자동으로 연결합니다."}
                       </span>
                     </TableCell>
-                  </TableRow>
+                  </TableRow>)}
                 </TableBody>
               </Table>
             </div>
@@ -484,7 +487,7 @@ export const DredgingRegistrationBody = ({
             data-testid="dredging-registration-status"
           >
             {statusMessage ||
-              "사진·준설일자·위치와 자동 연결 관로를 확인해주세요."}
+              (DREDGING_EXTERNAL_MODE ? "사진·준설일자·준설위치를 확인해주세요." : "사진·준설일자·위치를 확인해주세요. 관로 미지정 상태도 저장할 수 있습니다.")}
           </div>
         </aside>
 
@@ -504,7 +507,7 @@ export const DredgingRegistrationBody = ({
               statusText={
                 isEditingActiveLocation
                   ? hasUnappliedLocationDraft
-                    ? "새 위치를 선택했습니다. 관로 다시 찾기를 눌러 적용해주세요."
+                    ? (DREDGING_EXTERNAL_MODE ? "새 위치를 선택했습니다. 선택 위치 적용을 눌러주세요." : "새 위치를 선택했습니다. 관로 다시 찾기를 눌러 적용해주세요.")
                     : "지도에서 새 준설위치를 클릭해주세요."
                   : activeResolvedLocation
                     ? "등록된 준설위치를 표시하고 있습니다."
diff --git a/apps/sn/src/features/window-popup/model/popup-definitions.ts b/apps/sn/src/features/window-popup/model/popup-definitions.ts
index 6aace497f..e29bad85f 100644
--- a/apps/sn/src/features/window-popup/model/popup-definitions.ts
+++ b/apps/sn/src/features/window-popup/model/popup-definitions.ts
@@ -39,7 +39,7 @@ export const windowPopupDefinitions = {
     title: "준설결과 수정",
     width: 1280,
     height: 900,
-    requiredParams: ["dredgingJobSn", "pipeFid", "longitude", "latitude"],
+    requiredParams: ["dredgingJobSn", "targetSn", "longitude", "latitude"],
   },
   exmnPipeReport: {
     key: "exmnPipeReport",
diff --git a/apps/sn/src/features/window-popup/ui/dredging-popup-record.ts b/apps/sn/src/features/window-popup/ui/dredging-popup-record.ts
index 43061f6f7..9706786f8 100644
--- a/apps/sn/src/features/window-popup/ui/dredging-popup-record.ts
+++ b/apps/sn/src/features/window-popup/ui/dredging-popup-record.ts
@@ -23,14 +23,16 @@ export const buildDredgingPopupRecord = (
 ): DredgingRecord => ({
   id: getParam(searchParams.id),
   dredgingJobSn: getParam(searchParams.dredgingJobSn),
-  pipeFid: getParam(searchParams.pipeFid),
+  targetSn: getNumber(searchParams.targetSn),
+  mappingStatus: getParam(searchParams.mappingStatus) === "UNMAPPED" ? "UNMAPPED" : "AUTO",
+  pipeFid: getParam(searchParams.pipeFid) || null,
   mngInstCd: getParam(searchParams.mngInstCd),
   ctpv: getParam(searchParams.ctpv),
   sgg: getParam(searchParams.sgg),
   treatmentZone: getParam(searchParams.treatmentZone),
   fcltMngNo: getParam(searchParams.fcltMngNo),
-  pipeDiameterMm: getNumber(searchParams.pipeDiameterMm),
-  pipeLengthM: getNumber(searchParams.pipeLengthM),
+  pipeDiameterMm: getNullableNumber(searchParams.pipeDiameterMm),
+  pipeLengthM: getNullableNumber(searchParams.pipeLengthM),
   pipeMaterial: getParam(searchParams.pipeMaterial),
   installationYear: getNullableNumber(searchParams.installationYear),
   dredgingDate: getParam(searchParams.dredgingDate),
@@ -44,6 +46,6 @@ export const buildDredgingPopupRecord = (
     getParam(searchParams.registrationMode) === "MANUAL" ? "MANUAL" : "PHOTO",
   registrationSource:
     getParam(searchParams.registrationSource) === "MANUAL" ? "MANUAL" : "EXIF",
-  matchDistanceMeters: getNumber(searchParams.matchDistanceMeters),
+  matchDistanceMeters: getNullableNumber(searchParams.matchDistanceMeters),
   isMock: getParam(searchParams.isMock) === "true",
 });