My goal here is to have two users communicating with each other, one of which is coming towards the other one (for the sake of simplicity we'll call moovy the moving one and waity the one's who's waiting). Moovy needs to keep updated waity on the amount of time and distance left to reach him. Since waity might actually be waiting not only him but more than one user, I preferred to leave the calculation of the remaining time and distance on moovy's device and keep track of it on firebase's realtime database, while waity's device will be listening on a list of 'incoming users' To update firebase's real time database I put the 'calculating' login within the locationManager(didUpdateLocation) So my function looks something like this func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { let directionsRequest: MKDirections.Request = MKDirections.Request()                 directionsRequest.source = MKMapItem(placemark: MKPlacemark(coordinate: CLLocationCoordinate2D(latitude: coordinates.latitude, longitude: coordinates.longitude), addressDictionary: nil))                 directionsRequest.destination = MKMapItem(placemark: MKPlacemark(coordinate: CLLocationCoordinate2D(latitude: destination, longitude: destination.longitude), addressDictionary: nil))                 directionsRequest.requestsAlternateRoutes = true                 directionsRequest.transportType = .automobile                          let directions = MKDirections(request: directionsRequest)                 var approxTime: Double = 9999                 directions.calculate { [self] (response, error) -> Void in                      guard let response = response else {                          if let error = error {                              print("Error: \(error)")                          }                          return                      }                     if response.routes.count > 0 {                         let route = response.routes[0]                         approxTime = route.expectedTravelTime                         viewModel.updateDestination(destinationUserId: destination.userId, currentUsername: userStore.userData.username, currentUserLocation: locations.last!, approxTime: approxTime, distance: distanceFromChosen ?? 0) { result in                             print(result)                         }                      }                  } Where destination is Waity's location and id, viewModel is in charge of updating the real time database with Moovy's location, distance and time left to the arrival. It works pretty fine for the first 10 seconds or so and then it proceeds to stop updating the time and distance left due to a max calls limit reached on the calculate method Specifically Error: Error Domain=MKErrorDomain Code=3 "Directions Not Available" UserInfo={NSLocalizedFailureReason=Route information is not available at this moment., MKErrorGEOError=-3, MKErrorGEOErrorUserInfo={details = ({  intervalType = short;       maxRequests = 50;            "throttler.keyPath" = "app:com.app.bundleid/0x20200/short(default/any)";timeUntilReset = 33;            windowSize = 60; }); timeUntilReset = 33; }, MKDirectionsErrorCode=3, NSLocalizedDescription=Directions Not Available} Is this the right way to implement the goal I'm trying to achieve. Should I just limit the number of calls with some wait signal or should I use another approach?