diff --git a/E04_Stab3D/E04_Stab3D_Router.py b/E04_Stab3D/E04_Stab3D_Router.py
index a52acc53d..2416a95e8 100644
--- a/E04_Stab3D/E04_Stab3D_Router.py
+++ b/E04_Stab3D/E04_Stab3D_Router.py
@@ -184,7 +184,6 @@ def _overview(project_root: Path, root: Path) -> dict[str, Any]:
     for item in saved:
         current = run.fingerprint(finger_source, ground, item.pop("settings"))
         item["stale"] = item.pop("fingerprint") != current
-    points = source.db_snapshot(root).get("route_points") or []
     return {
         "sections": run.auto_sections(stations),
         "stations": [
@@ -196,9 +195,10 @@ def _overview(project_root: Path, root: Path) -> dict[str, Any]:
             }
             for s in stations
         ],
+        # 중심선 = 측점 중심(B06 누가 그대로 · route_points 는 접선 꺾은선이라 누가가 다름)
         "line": [
-            [float(p["model_x"]), float(p["model_y"]), float(p["chainage_m"])]
-            for p in sorted(points, key=lambda p: p["sequence_num"])
+            [float(s["center_x"]), float(s["center_y"]), float(s["chainage_m"])]
+            for s in sorted(stations, key=lambda s: float(s["chainage_m"]))
         ],
         "saved": saved,
         "defaults": SearchSettings().model_dump(),
diff --git a/E04_Stab3D/E04_Stab3D_Run.py b/E04_Stab3D/E04_Stab3D_Run.py
index 299ca5ca5..599886ce9 100644
--- a/E04_Stab3D/E04_Stab3D_Run.py
+++ b/E04_Stab3D/E04_Stab3D_Run.py
@@ -33,7 +33,7 @@ from E03_StabSection.E03_StabSection_Types import DEFAULT_ROAD_SURCHARGE_KPA
 from E04_Stab3D import E04_Stab3D_Engine_Grid as grid_engine
 from E04_Stab3D import E04_Stab3D_Engine_Search as search_engine
 
-ENGINE_VERSION = "e04-2"  # 엔진 판 — 바뀌면 지문이 달라져 다시 셈
+ENGINE_VERSION = "e04-3"  # 엔진 판 — 바뀌면 지문이 달라져 다시 셈
 STAGE_DIR = "E04_Stab3D"
 GROUND_FILE = Path("E02_StabGround") / "ground.json"
 SECTION_LENGTH_M = 100.0  # 자동 구간 길이
@@ -127,14 +127,19 @@ def _engine_station(root: Path, station: dict[str, Any]) -> dict[str, Any]:
 
 
 def _node_mask(
-    root: Path, grid: dict[str, Any], start_m: float, end_m: float, half_width_m: float
+    stations: list[dict[str, Any]],
+    grid: dict[str, Any],
+    start_m: float,
+    end_m: float,
+    half_width_m: float,
 ) -> np.ndarray:
     """탐색 노드 자리 = 중심선에서 half_width 안 · 가장 가까운 중심선 점의 누가가 구간 안
-    · 가장 가까운 점이 노선 양 끝점인 셀(노선 시점 앞 · 종점 뒤)은 뺌."""
-    points = sorted(
-        source.db_snapshot(root).get("route_points") or [], key=lambda p: p["sequence_num"]
+    · 가장 가까운 점이 중심선 양 끝점인 셀(시점 앞 · 종점 뒤)은 뺌.
+
+    중심선 = 측점 중심을 이은 선(B06 누가 그대로 · route_points 는 접선 꺾은선이라 누가가 다름)."""
+    line = np.array(
+        [[float(s["center_x"]), float(s["center_y"]), float(s["chainage_m"])] for s in stations]
     )
-    line = np.array([[p["model_x"], p["model_y"], p["chainage_m"]] for p in points], float)
     # 0.5 m 로 촘촘히 — 꺾인 점 사이 셀도 바른 누가
     dense = [line[:1]]
     for a, b in zip(line[:-1], line[1:]):
@@ -199,7 +204,7 @@ def run_engine(
     strata = grid_engine.strata_from_grid(
         grid, (ground or {}).get("materials"), water_depth_m=0.0 if wet else None
     )
-    mask = _node_mask(root, grid, settings["start_m"], settings["end_m"], half)
+    mask = _node_mask(stations, grid, settings["start_m"], settings["end_m"], half)
     ratios = (1.0,) if settings["shape"] == "sphere" else (1.0, float(settings["ellipsoid_ratio"]))
     params = search_engine.SearchParams(
         node_mask=mask,
diff --git a/resources/tester/test_533_3_e04_engine.py b/resources/tester/test_533_3_e04_engine.py
index a3549dc85..011197fd3 100644
--- a/resources/tester/test_533_3_e04_engine.py
+++ b/resources/tester/test_533_3_e04_engine.py
@@ -83,16 +83,6 @@ def root(tmp_path, monkeypatch):
     z = _ground(yy)
     np.savez(models / "dtm_classification.npz", x=xs, y=ys, z=z, valid_mask=np.ones_like(z, bool))
     monkeypatch.setattr(run.source, "cross_section", lambda r, ch: _cross(float(ch)))
-    monkeypatch.setattr(
-        run.source,
-        "db_snapshot",
-        lambda r: {
-            "route_points": [
-                {"model_x": ch, "model_y": 0.0, "chainage_m": ch, "sequence_num": i}
-                for i, ch in enumerate(CHAINAGES)
-            ]
-        },
-    )
     return tmp_path
 
 
@@ -185,10 +175,10 @@ def test_node_mask_section_and_route_ends(root):
     x = np.arange(-30.0, 131.0, 1.0)
     y = np.arange(-20.0, 21.0, 1.0)
     grid = {"x": x, "y": y}
-    mask = run._node_mask(root, grid, 0.0, 100.0, 12.0)
+    mask = run._node_mask(STATIONS, grid, 0.0, 100.0, 12.0)
     xx, yy = np.meshgrid(x, y)
     assert not mask[xx < -0.5].any() and not mask[xx > 100.5].any()
     assert not mask[np.abs(yy) > 12.0].any()
     assert mask[(np.abs(yy) <= 12.0) & (xx >= 1) & (xx <= 99)].all()
-    part = run._node_mask(root, grid, 20.0, 60.0, 12.0)
+    part = run._node_mask(STATIONS, grid, 20.0, 60.0, 12.0)
     assert not part[(xx < 19.5) | (xx > 60.5)].any() and part[(yy == 0) & (xx == 40)].all()
diff --git a/resources/tester/test_533_3_e04_router.py b/resources/tester/test_533_3_e04_router.py
index aac24b02b..0e7793b5d 100644
--- a/resources/tester/test_533_3_e04_router.py
+++ b/resources/tester/test_533_3_e04_router.py
@@ -57,21 +57,6 @@ def project(tmp_path, monkeypatch):
     z = 500.0 + 0.4 * (yy - 200.0) + 0.002 * (xx - 200.0) ** 2  # 노선 옆 비탈
     np.savez(models / "dtm_classification.npz", x=xs, y=ys, z=z, valid_mask=np.ones_like(z, bool))
     monkeypatch.setattr(run.source, "stations", lambda root: STATIONS)
-    monkeypatch.setattr(
-        run.source,
-        "db_snapshot",
-        lambda root: {
-            "route_points": [
-                {
-                    "model_x": s["center_x"],
-                    "model_y": 200.0,
-                    "chainage_m": s["chainage_m"],
-                    "sequence_num": i,
-                }
-                for i, s in enumerate(STATIONS)
-            ]
-        },
-    )
 
     async def fake_root(project_id):
         return tmp_path