Free GPS software for your smart phone

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GPS is absolutely a great device for our car while we are driving on the road. Sometimes, we can't recognize the direction, and we do in need of this electronic road guidance. What if you are lost in a street in the vicinity, such as a parking lot, or a shopping mall? How would you find your way out. fastmall is one of the new app you can download to your smart phone while you are lost in the shopping mall. you can find the nearest coffee shop, and other stores if you in need of search one. That is a great app while you are looking for a particular place. I believe there are other software available specifically for the smart phone or iPhone too. Do you know any of them?