unexplivitily, a guy used the gps jammer to fool them into not knowing where the van was and every time he drove by the airport, he took down the landing system. martha: wow. there isn t a single civilian receiver on the market that has any kind of rudimentary defense against gps spoofing, and so from my perspective, our u.s. civil infrastructure is wide open to an attack like this. reporter: as much as gps attacks could be a problem humphreys also says gps privacy is a problem, a little tiny dot, you can put that on a person, employees you re following and they have no way of knowing it s there and no way to get around it. privacy issues and national security issues, martha. martha: that is a fascinating story. john rob it s, enough, reporting from atlanta. bill: while you were sleeping last night, gas prices jumped 3 cents a gallon. the president will talk about that a bit later today. will his polices help or hurt? martha: i should have filled up before i went to