We rolling back ?

orchestrateur/sensors/gps.py

@@ -34,11 +34,13 @@ class GROVEGPS:
         self.longitude = -1.0
 
     def read(self):
-        """Reads the latest GGA sentence from serial, thread-safely."""
+        """Reads the freshest GGA sentence from serial, thread-safely."""
         with serial_lock:
-            for _ in range(10):  # Read pending lines from buffer
-                if self.ser.in_waiting == 0:
-                    break
+            # 1. Flush accumulated stale buffer data
+            self.ser.reset_input_buffer()
+
+            # 2. Read through the fresh incoming stream to find a complete GGA line
+            for _ in range(15):
                 raw_bytes = self.ser.readline()
                 try:
                     line = raw_bytes.decode('utf-8', errors='ignore').strip()