function navigateTo(latitude,longitude)
{
    var packageName = "com.google.android.apps.maps";
    var className = null;
    var action = "android.intent.action.VIEW";
    var uri =  "google.navigation:q="+latitude+","+longitude;
    if(app.IsAppInstalled( packageName ))
      app.SendIntent( packageName, className, action,null,uri );
    else
      app.Alert("maps app not installed");
}