A common GPS satellite positioning platform vulnerability disaster the user's location information in an emergency-vulnerability warning-the black bar safety net

Recently, in the news of the exposure of the many by the GPS positioning device, tracking the abduction of the event http://news.xinhuanet.com/legal/2015-11/15/c1284295262.htm in. Many users have to consult, there is no method for detecting it? So in the market to buy some GPS positioning...