public TramstopsViewModel(ITramsService tramsService)
        {
            this.tramsService = tramsService;

            var locator = new Geolocator {
                DesiredAccuracy = 50
            };

            locator.GetPositionAsync(timeout: 10000).ContinueWith(t => {
                this.GetNearbyTramStops(t.Result.Latitude, t.Result.Longitude);
            }, TaskScheduler.FromCurrentSynchronizationContext());
        }
 public JourniesViewModel(ITramsService tramsService)
 {
     this.tramsService = tramsService;
 }