public ShowGPSLocation()
{
InitializeComponent();
_graphicLocation = (MyMap.Layers["MyGraphicsLayer"] as GraphicsLayer).Graphics[0];
_watcher = new GeoCoordinateWatcher(GeoPositionAccuracy.High);
_watcher.MovementThreshold = 20;
_watcher.StatusChanged += watcher_StatusChanged;
_watcher.PositionChanged += watcher_PositionChanged;
// Start data acquisition
_watcher.Start();
}