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System where they absolutely know what it says? >> they absolutely know it. once you program the flight management system, there's an instrument called the primary flight display, pfd. it will have a compass rose, a magenta line. whatever you planned in for your route, it's your gps map. it has a magenta line, airplane symbol. it will show the track you're going to fly. if they begin to fly the track, let's say in this primary was changed to the secondary, unknowingly, as soon as they got to the waypoint where they had their last radio communication, they would have a hook in their flight plan...

Know what it says? >> they absolutely know it. once you program the flight management system, there's an instrument called the primary flight display, pfd. it will have a compass rose, a magenta line. whatever you planned in for your route, it's your gps map. it has a magenta line, airplane symbol. it will show the track you're going to fly. if they begin to fly the track, let's say in this primary was changed to the secondary, unknowingly, as soon as they got to the waypoint where they had their last radio communication, they would have a hook in their flight plan or in this magenta line show...