diff --git a/src/fc_network_module/fc_network_module/ntrip_client.py b/src/fc_network_module/fc_network_module/ntrip_client.py
index 04b63d5..6d4e8c2 100644
--- a/src/fc_network_module/fc_network_module/ntrip_client.py
+++ b/src/fc_network_module/fc_network_module/ntrip_client.py
@@ -2,6 +2,7 @@ import socket
 import base64
 import threading
 import time
+from typing import Optional, Tuple
 
 import rclpy
 from rclpy.node import Node
@@ -21,7 +22,7 @@ class GGA_stream():
         return f"{value:02X}"
 
     @classmethod
-    def decimal_to_nmea_dm(cls, deg: float, *, is_latitude: bool) -> tuple[str, str]:
+    def decimal_to_nmea_dm(cls, deg: float, *, is_latitude: bool) -> Tuple[str, str]:
         """十進位度 → NMEA 的 (d)dmm.mmmm 與半球字元。"""
         if is_latitude:
             hemi = "N" if deg >= 0 else "S"
@@ -82,7 +83,7 @@ class NtripClientNode(Node):
         self.declare_parameter('gga_lat', None)
         self.declare_parameter('gga_lon', None)
         self.declare_parameter('gga_alt_m', 100)
-        self.declare_parameter('gga_interval_sec', 300)
+        self.declare_parameter('gga_interval_sec', 60)
 
         rtcm_qos = QoSProfile(
             history=HistoryPolicy.KEEP_LAST,
@@ -92,7 +93,9 @@ class NtripClientNode(Node):
         )
         self.publisher_ = self.create_publisher(RTCM, '/fc_network/rtcm_input', rtcm_qos)
 
-        self._running = True
+        self._stop_event = threading.Event()
+        self._sock_lock = threading.Lock()
+        self._active_sock: Optional[socket.socket] = None
         self._thread = threading.Thread(target=self._receive_loop, daemon=True)
         self._thread.start()
 
@@ -100,6 +103,15 @@ class NtripClientNode(Node):
 
     # ── NTRIP 連線 + RTCM 接收迴圈 ──────────────────────────────
 
+    def _request_stop(self):
+        self._stop_event.set()
+        with self._sock_lock:
+            if self._active_sock is not None:
+                try:
+                    self._active_sock.close()
+                except OSError:
+                    pass
+
     def _receive_loop(self):
         backoff = self.RECONNECT_BASE_SEC
 
@@ -113,10 +125,12 @@ class NtripClientNode(Node):
             self.get_logger().error('mountpoint 參數未設定...')
             return
 
-        while self._running:
+        while not self._stop_event.is_set():
 
             sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
             sock.settimeout(10)
+            with self._sock_lock:
+                self._active_sock = sock
 
             self.gga_lat = self.get_parameter('gga_lat').value
             self.gga_lon = self.get_parameter('gga_lon').value
@@ -154,18 +168,26 @@ class NtripClientNode(Node):
                 self._read_stream(sock)
 
             except Exception as e:
-                if self._running:
-                    self.get_logger().warn(f'連線中斷: {e}，{backoff:.0f}s 後重連')
-                    time.sleep(backoff)
-                    backoff = min(backoff * 2, self.RECONNECT_MAX_SEC)
+                if self._stop_event.is_set():
+                    break
+                self.get_logger().warn(f'連線中斷: {e}，{backoff:.0f}s 後重連')
+                if self._stop_event.wait(timeout=backoff):
+                    break
+                backoff = min(backoff * 2, self.RECONNECT_MAX_SEC)
             finally:
-                sock.close()
+                with self._sock_lock:
+                    if self._active_sock is sock:
+                        self._active_sock = None
+                try:
+                    sock.close()
+                except OSError:
+                    pass
 
     def _read_stream(self, sock: socket.socket):
         buf = b''
         last_gga_time = 0.0
 
-        while self._running:
+        while not self._stop_event.is_set():
             now = time.time()
             if self.gga_on and (now - last_gga_time >= self.gga_interval_sec):
                 line = GGA_stream.send_gga(sock, self.gga_lat, self.gga_lon, self.gga_alt_m)
@@ -175,8 +197,16 @@ class NtripClientNode(Node):
             try:
                 chunk = sock.recv(4096)
             except socket.timeout:
+                if self._stop_event.is_set():
+                    break
                 continue
+            except OSError:
+                if self._stop_event.is_set():
+                    break
+                raise
             if not chunk:
+                if self._stop_event.is_set():
+                    break
                 raise ConnectionError("stream ended. Empty Chunk")
             buf += chunk
 
@@ -203,8 +233,11 @@ class NtripClientNode(Node):
         self.publisher_.publish(msg)
 
     def destroy_node(self):
-        self._running = False
-        self._thread.join(timeout=3.0)
+        self._request_stop()
+        if self._thread.is_alive():
+            self._thread.join(timeout=5.0)
+            if self._thread.is_alive():
+                self.get_logger().warn('receive thread 未在時限內結束')
         super().destroy_node()
 
 
diff --git a/src/unitdev02/unitdev02/devnote.txt b/src/unitdev02/unitdev02/devnote.txt
index df3e429..513e734 100644
--- a/src/unitdev02/unitdev02/devnote.txt
+++ b/src/unitdev02/unitdev02/devnote.txt
@@ -34,6 +34,8 @@ python -m fc_network_module.fc_network_module.ntrip_client --ros-args -p mountpo
 
 python -m fc_network_module.fc_network_module.ntrip_client --ros-args -p host:=210.241.63.193 -p port:=81 -p mountpoint:=2020_GNSS -p username:=uavlab6061 -p password:=iamsupersmart
 
+python3 -m fc_network_module.fc_network_module.ntrip_client --ros-args -p host:=210.241.63.193 -p port:=81 -p mountpoint:=2020_GNSS -p username:=uavlab6061 -p password:=iamsupersmart -p gga_on:=True -p gga_lat:=24.155792000 -p gga_lon:=120.630679000 -p gga_interval_sec:=60
+
 export ROS_DOMAIN_ID=13
 ros2 daemon stop
 ros2 daemon start