Another bugfix for the mock GPS

spatz/sensors/gps/gps.py

@@ -26,16 +26,16 @@ class GPS(Sensor):
         super().__init__(dataset, logger, transforms)
 
     def _get_data(self) -> ArrayLike:
-        vel = norm(self._dataset.get_velocity())
+        vel = self._dataset.get_total_velocity()
 
         # TODO: At which speed do we assume that GPS becomes unreliable?
-        if vel / self._dataset.get_mach_number() > 1:
+        if vel / self._dataset.get_speed_of_sound() > 1:
             return np.array([0, 0, 0])
         
         x = self._dataset.fetch_values(['latitude', 'longitude', 'altitude'])
         x = self._sensor_specific_effects(x)
 
         # Convert to degrees.
-        x * 180 / math.pi
+        x *= 180 / math.pi
 
         return x