Chamando método Async no OnNavegatedTo

gistfile1.cs

  protected override async void OnNavigatedTo(NavigationEventArgs e)
    {
      LoadCity();
      await StartGeoLocation();
      base.OnNavigatedTo(e);
    }
        
  private async Task StartGeoLocation()
        {
            try
            {
                City city = new City();
                if (city.GetCurrencyCity() == null)
                {
                    //TODO Preciso verificar o load da localizacao
                    Geolocator geolocator = new Geolocator();
                    //geolocator.DesiredAccuracyInMeters = 50;
                    geolocator.DesiredAccuracy = PositionAccuracy.High;
                    Geoposition geoposition = await geolocator.GetGeopositionAsync(
                         maximumAge: TimeSpan.FromMinutes(5),
                        timeout: TimeSpan.FromSeconds(10) 
                        );
                    SetCurrentLocation(geoposition.Coordinate.Latitude, geoposition.Coordinate.Longitude);
                }
            }
            catch (Exception ErroStartLocation)
            {
                System.Diagnostics.Debug.WriteLine("Error load");
            }
        }