@joebob2000
we not talking your tomtom garmin kind of device here, it dont need maps functions, doesn't need to know where it is, heck it probably doesn't even need to transcieve it just needs to be able to be picked up by a GPS system, it's not that far of current RFIDs in principle and function, which are dirt cheap to embed
and it's never about the next $5 purchase, your spending habits and lifestyle is far more valuable then $5, ever wondered why there is a starbucks nearby when your feeling thirsty, thats a little more then just convenient