that worked at nasa. i said, do you think there's any connection between these two things? they said, certainly maybe. back then gps was not aye certified way of navigating. everybody used it. they had a portable gps that they put in their plane as a backup. they would fly over large bodies of water with that gps. when the discovery was launched nasa authorized that to the discovery challenger. at that point the airplanes were out in the middle of the oesh and they lost navigation so it's very important to keep your eyes open to a lot of different things, not just try to focus in. >> so we know that can be a possibility because it's happened before. you bring up gps. i'm curious because we now know, too, that these family members that are sitting with baited breath to see what happened to their loved ones and they're able to call some of these passengers. the phones are ringing. could they somehow use the phone gps to try to track this plane? >> you know, i'm not a gps expert on the telephones, how