why did didupdatelocation be called when device is not moved

Question

i use CLLocation for a app that record people's trace in map view when they are running or walking ,but i found when my device is still (not moved) ,the - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations is also get called frequently ? currently ,my locationmanager's desiredAccuracy is 10 meters and distanceFilter is 10.

how to deal with this situation? I have tried use big distancefilter value(like 150) ,but I found if i do this, then i can't record exactly when people is running or walking

Answer 1

GPS is not exact. You can move around a few feet and get the same location. Or you can sit still and get told you have moved a few feet.

You might be able to combine measurements from the accelerometer to determine if you have really moved but this would only work if the device was sitting on a table not moving.

Answer 2

Have you called stopUpdatingLocation after the initial startUpdatingLocation? It will keep updating location if you do not call it.