If you’ve been browsing GPS devices you might have seen some of them, particularly GPS enabled smartphones, boasting A GPS. What is A GPS? What are the benefits.Can i listen to fm radio using my iphone in a car that doesn`t have a stereo without using up data? Does chow a lot of data to play on line radio in an ipad?.All good info but still have question about data. The GPS has much information but if a new data set was of value to all, can that field be created and populated?.The Global Positioning System satellites transmit signals to equipment on the ground. GPS receivers passively receive satellite signals they do not transmit. GPS .