over the gulf of mexico where you do not have radar coverage. but it -- the coverage is now with the disappearance of flight 370, could this kind of technology essentially prevent a plane from disappearing? here is the thing. the plane's transponder would still need to be on. if it is off, the plane would still disappear. and as you know, already said that flight 370's transponder was turned off, carol. >> to make it clear for our viewers, this new gps system, just to simplify things, the fa a's requiring planes to have them by the year 2020, is that right? >> right. so, here's the breakdown. we do know that some 100 air traffic controllers, they are already using the technology. in another five years, another 130 of the air traffic control towers will also be using it. and in another six years, all airplanes must have the equipment on board that would enable them to be tracked in